This volume contains unrefereed manuscripts scheduled for presentation at the Fifth International Conference on Electronic Properties of Two-Dimensional Systems to be held at Oxford, UK, 5-9 September 1983. In some cases abstracts or extended abstracts have been inserted for manuscripts not ready in time for the preparation of this volume. Referred manuscripts are to be published in a special issue of Surface Science scheduled for Spring 1984. The Proceedings of earlier conferences in this...
Topics: DTIC Archive, OXFORD UNIV (ENGLAND), *ELECTRONICS, *SYMPOSIA, *SYSTEMS ENGINEERING, *TWO...
Three subtasks were performed in this research study and the respective findings are described here. A) Investigation of the system of surface modified nanostructured bulk: Our studies show that the CuFeSe2 thin film on Si (or SiO2) substrates exhibit large thermal power in the order of 1300 microvolt/K at approximately 300K. We conclude that the thinner films have the higher thermal conductivity. At 300K, the magnitude of thermal conductivity 8.8 W/m-K for 200 nm is about two times larger than...
Topics: DTIC Archive, ACADEMIA SINICA NANKANG TAIPEI (TAIWAN) INST OF PHYSICS, *THERMOELECTRICITY, *FIGURE...
Topics: DTIC Archive, Hung,Fan Ching, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *DETECTORS, *STRAIN...
Recording of Electric Waves on Paper and its Foundation in Theory. By means of this method it is possible to chemically record on white paper the presence of a multi-variable electrical field and also the track of fall or passage of electromagnetic waves; consequently to detect these without the aid of a galvanometer, thermoelectric couple, or any other instruments with wires. The method Consists of the use of a detector of the short coherer type which is provided with electrodes of different...
Topics: DTIC Archive, Arkad'yev, V., JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA, *USSR, *FOREIGN...
This report presents designs of two compact, unattended nuclear power utilizing H-Rho reactor control. One plant is a 100-kilowat(e) system with Stirling cycle conversion; the other is a conduction-cooled 10-kilowatt(e) thermoelectric system. The conduction system is based upon current technology, while the Stirling system requires an extended life Stirling engine for optimal performance. In addition to the performance the results of parametric studies of system operation at other power levels...
Topics: DTIC Archive, Magladry, R, ISOTOPES INC MIDDLE RIVER MD NUCLEAR SYSTEMS DIV, *NUCLEAR POWER PLANTS,...
The use of activated carbon fabrics (ACEs) that are desorbed electrothermally, also known as the Joule effect, is explored as a potential method to create a regenerating chemical warfare agent (CWA) filter. Electrical resistance vs. temperature measurements are presented for Kynol-based ACE and compared with results for ACEs produced from other substrates. Adsorption and desorption results for dimethylmethylphosphonate (DMMP) demonstrate that organophosphate compounds can be effectively...
Topics: DTIC Archive, Sullivan, Patrick D, AIR FORCE RESEARCH LAB TYNDALL AFB FL, *CARBON FIBERS,...
This report covers in detail the research work of the Solid State Division at Lincoln Laboratory for the period 1 November 2002 through 31 January 2003. The topics covered are Quantum Electronics, Electro-optical Materials and Devices, Submicrometer Technology, Biosensor and Molecular Technologies, Advanced Imaging Technology, Analog Device Technology, and Advanced Silicon Technology. Funding is provided by several DoD organizations- including the Air Force, Army, DARPA, MDA, Navy, NSA, and...
Topics: DTIC Archive, Shaver, David C, MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *ELECTROOPTICS,...
A thermoelectric power supply concept was evaluated. The concept involved using the heat generated when a round is fired as the input heat to a direct conversion module to produce electrical energy. Open circuit voltages as high as 8 volts were recorded. These voltages were obtained under simulating firings of 30 mm rounds. A thermoelectric power supply using hot propellant gages is definitely feasible.
Topics: DTIC Archive, Dante, James G, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *IMPACT...
The linear thermopile consisting of Bi and Ag wires with rectangular receivers attached to the junctures of these two metals has all the advantages of a good bolometer with none of its disadvantages. Its novelty consists in a series of overlapping receivers forming a continuous surface. The object of the present paper is to illustrate various modifications and uses to which this instrument has been adapted and to indicate further applications. The continuous surface of the receiver has a...
Topics: thermoelectricity, Condensed matter, electronic structure, electrical, magnetic, and optical...
Advanced RF systems on chip will benefit from microelectromechanical (MEMS) tunable capacitors integrated on a CMOS or BICMOS chip with high quality factor (Q) and large tuning range. RF circuits with on-chip CMOS/BICMOS MEMS tunable capacitors will have small footprints and will not have the reduction in tuning range coming from fixed capacitance between off-chip circuit parts. CMOS-MEMS micro-movers that use the principles of self-assembly and electrothermal actuation are successfully...
Topics: DTIC Archive, CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING,...
We report measurements of the interaction between plasma radiation and solid propellant. We made heat flux measurements of the electrothermal plasma jet impinging on a sensor mimicking a disk of propellant. We made planar laser-induced fluorescence images of NO, a JA2 decomposition product at the propellant surface. High speed video imaging of the propellant surface and scattering of ejected particles was used to study how the propellant surface evolves during exposure to plasma radiation....
Topics: DTIC Archive, Varghese, Philip L, TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS, *RADIATION, *SOLID...
We seek to understand the effective behavior of thermoelectric composites using rigorous homogenization technique in this project. In the last three years, our accomplishment includes: (1) rigorous analysis of thermoelectric field distribution and effective properties of layered thermoelectric structures, showing that their effective figure of merit is not bounded by the constituent phases, in contrast to the previous claim; (2) identification of condition for optimal conversion efficiency of...
Topics: DTIC Archive, WASHINGTON UNIV SEATTLE, *COMPOSITE MATERIALS, *THERMOELECTRICITY, CONVERSION,...
Understanding thermal transport from nanoscale heat sources is important for a fundamental description of energy flow in materials as well as for many technological applications including thermal management in nanoelectronics and optoelectronics, thermoelectric devices, nanoenhanced photovoltaics, and nanoparticle-mediated thermal therapies. Thermal transport at the nanoscale is fundamentally different from that at the macroscale and is determined by the distribution of carrier mean free paths...
Topics: DTIC Archive, COLORADO UNIV AT BOULDER, *DISSIPATION, *MICROELECTRONICS, *THERMOELECTRICITY,...
U.S. Army systems increasingly require novel methods of high density, fast charging power sources. In this study, a novel alternative to traditional batteries, catalytic microcombustors utilizing hydrocarbon fuels, are fabricated and characterized. These devices are found to be robust, easy to start up, operable over a wide range of compositions and temperatures, and able to support complete combustion over a range of fuels and fuel/air ratios. Various materials of construction are investigated...
Topics: DTIC Archive, Norton, D G, DELAWARE UNIV NEWARK DEPT OF CHEMICAL ENGINEERING, *FUELS,...
The material figure-of-merit for conventional thermoelectrics is micro meff 1.5/beta where micro is the electron or hole mobility, meff its effective mass, and beta the material thermal conductivity. From the electronic point of view, in order to optimize the cooler performance, there is a trade off between electron effective mass and its mobility. While high mobility is inherently important to facilitate electron transport in the material and reduce the Joule heating, a large effective mass is...
Topics: DTIC Archive, Shakouri, Ali, CALIFORNIA UNIV SANTA CRUZ SCHOOL OF ENGINEERING, *ELECTRICAL...
These data sheets present a compilation of a wide range of electronic properties for lead sulfide. Electrical properties include conductivity, dielectric constant, Hall coefficient, and mobility. Emission data have been broken down into the varied electron and photon emissions which result from application of electromagnetic energy over a wide spectrum and a wide variety of photoelectronic phenomena is shown. Energy data include energy bands, energy gap, and energy levels, as well as effective...
Topics: DTIC Archive, Neuberger, M, HUGHES AIRCRAFT CO CULVER CITY CA ELECTRONIC PROPERTIES INFORMATION...
The fabrication and characterization of SiGe/Si superlattice coolers are described. Superlattice structures were used to enhance the device performance by reducing the thermal conductivity between the hot and the cold junctions, and by providing selective removal of hot carriers through thermionic emission. Cooling of 2.2 K and 2.5 K were measured on n-type and p-type 75 * 75 micronmeter2 devices, corresponding to cooling power densities of hundreds of watts per square centimeter. Cooling up to...
Topics: DTIC Archive, Fan, Xiaofeng, CALIFORNIA UNIV SANTA BARBARA DEPT OF ELECTRICAL AND COMPUTER...
A thermoelectric power supply concept was evaluated. The concept involved using the heat generated when a round is fired as the input heat to a direct conversion module to produce electrical energy. Open circuit voltages as high as 8 volts were recorded. These voltages were obtained under simulating firings of 30 mm rounds. A thermoelectric power supply using hot propellant gages is definitely feasible.
Topics: DTIC Archive, Dante, James G, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *IMPACT...
Development and evaluation of a Scintillator Fiber-optic Reticon Detector array (SFRD) for application to a high-resolution computed tomography (CT) instrument, or Tomoscope, has been carried out. The objectives were to develop cryogenic cooling and electronic control and amplification to improve the detector noise performance and to evaluate the thermal, electronic and X-ray performance of the detector package. The thermoelectric cryostat was developed with a temperature floor of -70 C and...
Topics: DTIC Archive, Smith, J A, ADVANCED RESEARCH AND APPLICATIONS CORPSUNNYVALE CA, *HIGH RESOLUTION,...
Partial contents: Effect of SiO2 on Grain Growth and Densification of Alumina Prepared by SOL-Gel Technique; The Interfacial Segregation of Mg and Ca During Sintering of Alumina; In-Situ Observation of Structural Changes of Y-TZP by X-Ray Diffraction; Microstructure Control and Thermoelectric Characteristics of Porous SiC Ceramics; Mechanical Properties and Fatigue of Piezoelectric Ceramics; Direct Preparation of BaTiO3 Powders and Thin Films From Titanium Metal by Hydrothermal-Electrochemical...
Topics: DTIC Archive, JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA, *CERAMIC MATERIALS, METALS,...
Topics: DTIC Archive, AKADEMIYA NAUK SSSR LENINGRAD FIZIKO-TEKHNICHESKII INSTITUT, *SYMPOSIA,...
A simple, safe, and reliable thermoelectric device for heating or cooling potable water for use in military vehicles was developed. the unit is capable of cooling water to 60 F in ambient temperatures up to 130 F and heating to 150 F in ambient temperatures of 40 F. Freezing/overheating and undervoltage protections are provided. The unit has also cooling/heating indicators, water ready indicators, and automatic switch off. A total of six units were built, tested, and delivered to U.S. Army...
Topics: DTIC Archive, Mathipraksam, B, MIDWEST RESEARCH INST KANSAS CITY MO, *DRINKING WATER, *HEATING,...
Studies related to leakage currents and intrinsic degradation of multilayer ceramic capacitors and related materials were performed. For the X7R materials studied, the following results confirmed that the charge carrier for current is the electron: constant leakage current; negative thermoelectric voltage; negligible galvanic voltage; presence of space charge limited current. Thermal activation energies decreased with voltage for barrier layer, COG and Z5U types, but not for X7R. Such voltage...
Topics: DTIC Archive, Burton, L C, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG COLL OF ENGINEERING,...
This report covers in detail the research work of the Solid State Division at Lincoln Laboratory for the period 1 August through 31 October 1996. The topics covered are Quantum Electronics, Electrooptical Materials and Devices, Submicrometer Technology, High Speed Electronics, Microelectronics, Analog Device Technology, and Advanced Silicon Technology. Funding is provided primarily by the Air Force, with additional support provided by the Army, DARPA, Navy, BMDO, NASA, and NIST.
Topics: DTIC Archive, Shaver, David C., MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB,...
The purpose of this project was to design, construct and test a ground source heat engine that would operate on the temperature difference between the air and the ground to produce a small amount of electrical power. During the design phase, expressions for an optimally matched heat exchanger and thermoelectric module configuration were derived. A prototype was constructed according to the design procedure developed in the first phase of the project using an off-the-shelf thermoelectric module....
Topics: DTIC Archive, Stevens, James W, MISSISSIPPI STATE UNIV MISSISSIPPI STATE, *THERMOELECTRIC POWER...
The effects of ionizing radiation on the operation of polysilicon mmicroelectromechanical system (MEMS) electrostatic actuators, electrothermal actuators, and residual stress cantilevers were examined. Pre-irradiation, in-situ, and post-irradiation measurements were taken for the electrosatic and electrothermal actuators. The residual stress cantilevers were characterized before and after irradiation. All devices were irradiated to a total ionizing does of 1 megarad(Si) using both the Air Force...
Topics: DTIC Archive, Caffey, Jared R, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING...
Use of a specific Peltier temperature control device, called a 'thermoelectric thermal barrier,' to protect heat-sensitive electronic circuit elements from closely associated heat-producing elements in a microelectronic assembly is discussed. Test results on a simulated binary divider micro-module indicate the feasibility of the thermoelectric thermal barrier approach. Experimental results with a simulated micro module operating at temperatures between 25 C and 95 C indicate that it is possible...
Topics: DTIC Archive, FitzGerald, Robert D, ARMY ELECTRONICS LABS FORT MONMOUTH NJ, *MODULES(ELECTRONICS),...
The AFOSR support has enabled us to acquire tools to study interfaces in superconducting, thermoelectric, and magnetic materials, including a custom-designed fully integrated growth and characterization system and in situ tools to be integrated into our existing high-resolution transmission electron microscope (TEM). In order to precisely fabricate and characterize materials with prescribed interfaces, we have purchased major components parts to build a specially designed highly versatile...
Topics: DTIC Archive, Chu,Paul C, University of Houston Houston United States, magnetic materials, high...
Topics: DTIC Archive, Foote, Paul D, NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD, *TEMPERATURE, *HIGH...
A working model of a thermochemical gas analyzer for continuous detection of oxygen in gaseous mixtures containing up to 10% O2 has been constructed and tested under laboratory conditions. The action of the gas analyzer is based on using the relationship of the emf of a platinum and iridium platinum thermocouple, on which flameless hydrogen combustion occurs at a temperature in the gaseous medium of 250-300 degrees due to the oxygen in the gas to be analyzed. The research data may be used for...
Topics: DTIC Archive, TSYPLYATNIKOV, G P, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *THERMOCOUPLES,...
Abstracts are given for research efforts on airbreathing combustion, rocket propulsion, and diagnostics of reacting flows. Keywords: Shear layers, Turbulence, Instability, Electromagnetic propulsion, Plasma propulsion, Erosion, Magnetoplasmadynamic thrusters, Fluid dynamics, Arcjet thrust chambers, Electrothermal propulsion, Laser thermal propulsion, Electric discharges, Chemical kinetics, Nitramines, Nitroform compounds, Solid propellants, Acoustic flow fields, Solid rocket combustion...
Topics: DTIC Archive, Tishkoff, J M, CALIFORNIA INST OF TECH PASADENA DIV OF ENGINEERING AND APPLIED...
The goal of this project is to demonstrate factorial improvement in the thermoelectric figure of merit (ZT) with thin film Bi2Te3/Sb2Te3 superlattice (SL) structures compared to state of the art bulk Bi(2-x)Sb(x)Te3 alloys for high performance thermoelectric devices. The motivation for the use of SL structures has been the hypothesis that the atomic size and mass differences at the SL interfaces as well as the periodic SL structure result in enhanced phonon scattering leading to a reduction in...
Topics: DTIC Archive, Venkatasubramanian, Rama, RESEARCH TRIANGLE INST RESEARCH TRIANGLE PARK NC,...
A unique nondestructive materials characterization facility has been established for non-contacting thermoelectric inspection of metals. The measurement system is based on a high-temperature SQUID magnetic scanner that is capable of detecting the weak magnetic field of thermoelectric currents developing around material imperfections when a conducting metal is subjected to external heating and cooling. Since the surrounding intact material serves as the reference electrode and there is no...
Topics: DTIC Archive, Nagy, Peter B, CINCINNATI UNIV OH DEPT OF AEROSPACE ENGINEERING AND ENGINEERING...
The development of materials for high temperature thermoelectric energy conversion devices was investigated. The development of new criteria for the selection of materials which is based on understanding of the fundamental principles governing the behavior of high temperature thermoelectric materials is discussed. The synthesis and characterization of promising new materials and the growth of single crystals to eliminate possible problems associated with grain boundaries and other defects in...
Topics: NASA Technical Reports Server (NTRS), CRYSTAL GROWTH, POLYCRYSTALS, REFRACTORY MATERIALS,...
Given here are the proceedings of the 3rd Space Exploration Initiative (SEI) Technical Interchange. Topics covered include the First Lunar Outpost (FLO), the Lunar Resource Mapper, lunar rovers, lunar habitat concepts, lunar shelter construction analysis, thermoelectric nuclear power systems for SEI, cryogenic storage, a space network for lunar communications, the moon as a solar power satellite, and off-the-shelf avionics for future SEI missions.
Topics: NASA Technical Reports Server (NTRS), CONFERENCES, HABITATS, LUNAR BASES, LUNAR COMMUNICATION,...
A device for generating power to run an electronic component. The device includes a heat-conducting substrate (composed, e.g., of diamond or another high thermal conductivity material) disposed in thermal contact with a high temperature region. During operation, heat flows from the high temperature region into the heat-conducting substrate, from which the heat flows into the electrical power generator. A thermoelectric material (e.g., a BiTe alloy-based film or other thermoelectric material) is...
Topics: NASA Technical Reports Server (NTRS), THERMOELECTRIC POWER GENERATION, THERMOELECTRICITY,...
Traditional silicon germanium high temperature thermoelectrics have potential for improvements in figure of merit via nano-structuring with a silicide phase. A second phase of nano-sized silicides can theoretically reduce the lattice component of thermal conductivity without significantly reducing the electrical conductivity. However, experimentally achieving such improvements in line with the theory is complicated by factors such as control of silicide size during sintering, dopant...
Topics: NASA Technical Reports Server (NTRS), SILICON, GERMANIUM, THERMOELECTRICITY, TUNGSTEN, SILICIDES,...
In order to provide a complete description of a materials thermoelectric power factor, in addition to the measured nominal value, an uncertainty interval is required. The uncertainty may contain sources of measurement error including systematic bias error and precision error of a statistical nature. The work focuses specifically on the popular ZEM-3 (Ulvac Technologies) measurement system, but the methods apply to any measurement system. The analysis accounts for sources of systematic error...
Topics: NASA Technical Reports Server (NTRS), THERMOELECTRICITY, SYSTEMATIC ERRORS, ELECTRICAL RESISTIVITY,...
This paper describes thermal performance of a loop heat pipe (LHP) with two evaporators and two condensers in ambient testing. Each evaporator has an outer diameter of 15mm and a length of 76mm, and has an integral compensation chamber (CC). An aluminum mass of 500 grams is attached to each evaporator to simulate the instrument mass. A thermoelectric cooler (TEC) is installed on each CC to provide heating as well as cooling for CC temperature control. A flow regulator is installed in the...
Topics: NASA Technical Reports Server (NTRS), TEMPERATURE EFFECTS, TEMPERATURE CONTROL, HEAT PIPES,...
This paper presents a comparison of reactor and power conversion design options for 50 kWe class lunar and Mars surface power applications with scaling from 25 to 200 kWe. Design concepts and integration approaches are provided for three reactor-converter combinations: gas-cooled Brayton, liquid-metal Stirling, and liquid-metal thermoelectric. The study examines the mass and performance of low temperature, stainless steel based reactors and higher temperature refractory reactors. The preferred...
Topics: NASA Technical Reports Server (NTRS), FISSION, MARS SURFACE, LUNAR SURFACE, BRAYTON CYCLE,...
The apparatus would include a solar photovoltaic panel mounted on the roof and a panellike assembly mounted in a window opening. The window-mounted assembly would include a stack of thermoelectric devices sandwiched between two heat sinks. A fan would circulate interior air over one heat sink. Another fan would circulate exterior air over the other heat sink. The fans and the thermoelectric devices would be powered by the solar photovoltaic panel. By means of a double-pole, double-throw switch,...
Topics: NASA Technical Reports Server (NTRS), AUTOMOBILES, HEATERS, HEATING EQUIPMENT, PHOTOVOLTAIC CELLS,...
A document presents a study of why materials of composition (Ag1 ySbTe2)0.05 (PbTe)0.95 [0< or = y < or = 1] were previously reported to have values of the thermoelectric figure of merit [ZT (where Z = alpha(sup 2)/rk, alpha is the Seebeck coefficient, r is electrical resistivity, k is thermal conductivity, and T is absolute temperature)] ranging from <1 to >2. In the study, samples of (AgSbTe2)0.05(PbTe)0.95, (Ag0.67SbTe2)0.05 (PbTe)0.95, and...
Topics: NASA Technical Reports Server (NTRS), THERMOELECTRICITY, MICROANALYSIS, ELECTRICAL RESISTIVITY,...
Electronic heat-transfer devices of a proposed type would exploit some of the quantum-wire-like, pseudo-superconducting properties of single-wall carbon nanotubes or, optionally, room-temperature-superconducting polymers (RTSPs). The devices are denoted thermo-electron ballistic (TEB) coolers or heaters because one of the properties that they exploit is the totally or nearly ballistic (dissipation or scattering free) transport of electrons. This property is observed in RTSPs and carbon...
Topics: NASA Technical Reports Server (NTRS), CARBON NANOTUBES, COOLERS, HEAT TRANSFER, HEATERS,...
The Thermal Control Subsystem (TCS) is a key part of the Advanced Plant Habitat (APH) for the International Space Station (ISS). The purpose of this subsystem is to provide thermal control, mainly cooling, to the other APH subsystems. One of these subsystems, the Environmental Control Subsystem (ECS), controls the temperature and humidity of the growth chamber (GC) air to optimize the growth of plants in the habitat. The TCS provides thermal control to the ECS with three cold plates, which use...
Topics: NASA Technical Reports Server (NTRS), COMPUTATIONAL FLUID DYNAMICS, TEMPERATURE CONTROL, EUROPEAN...
As an application to thermos transducer, bio nano process was developed. Distance controlled nanoparticles (NPs) array was investigated using a simple spin coating process. It was found that the separation distance of NPs was controlled at the nanoscale by using Poly-Ethylene Glycols (PEGs).
Topics: DTIC Archive, NARA INST OF SCIENCE AND TECHNOLOGY IKOMA (JAPAN), *NANOMATERIALS, *SPIN COATINGS,...
This report summarizes performance characteristics of candidate power sources planned particularly for use by indigenous forces of friendly, underdeveloped nations. Older types of power sources, such as heat engines, hydroelectric and magnetohydrodynamic, are suggested for continued research and development. Newer concepts, such as fuel cells, thermoelectric, thermionic, and solar, are investigated for special applications. A table which summarizes in detail the status of technologic...
Topics: DTIC Archive, BOOZ-ALLEN APPLIED RESEARCH BETHESDA MD, *ELECTRIC POWER PRODUCTION, *ELECTRIC POWER...
Progress in Thermoelectricity continues on schedule. A gratifying number of materials improvements have appeared both in government sponsored and industry sponsored work. Some of the results are still proprietary such as the material that appears to have a Z that approaches 1 x 10(exp -3) at 1800 deg C. Others have been announced such as the Bell Laboratory work that produced Z of 5 x 10(exp -3) at 80 deg K. Some of the announcements (including some of the data in this issue concerning...
Topics: DTIC Archive, Davisson, J. W., NAVAL RESEARCH LAB WASHINGTON DC, *THERMOELECTRIC POWER GENERATION,...
Partial contents: Nanocrystalline Ceramics by Solid State Thermolysis of Metalorganic Polymers; Trends in Ceramic Materials Development into the Third Millennium; SHS of Dense in situ Composites via Pressure Assisted Thermal Explosion: experiment and modeling; Forewood; Contaminants, Additives and Dopants in Modern Materials Science; Inorganic Nanotubes and Inorganic Fullerane-like Materials from Layered Compounds: synthesis, properties and applications; Kinetics and Thermodynamics of SHS...
Topics: DTIC Archive, TECHNION - ISRAEL INST OF TECH HAIFA DEPT OF MATERIALS ENGINEERING, *COMPOSITE...
Studies are being made of the semiconducting properties of single crystals of PbTe. Prolonged heating of the Pb in a Vycor vessel before adding the Te apparently aided in the removal of oxides. The excess Pb excluded during growth appeared as a free-Pb cap on the end of the crystal. The crystal was cleaved into slices about 1/8 in. thick to measure the thermoelectric effect. The top slice was n type; the others were p type. A p-n juncture was found. Tesistivity (rho) measurements were made over...
Topics: DTIC Archive, ILLINOIS UNIV AT URBANA ELECTRICAL ENGINEERING RESEARCH LAB, *SEMICONDUCTORS,...
The factors involved in the forming of point contact tunnel diodes by the application of brief electrical overloads are studied. As a test of the theory, a diode fabricated from N-doped germanium and an aluminum cat whisker is used through the paper. After a brief review of the thermal and electrical conductivities of heavily doped germanium at elevated temperatures, an evaluation is made of the critical breakdown voltage (the applied voltage below which no forming of any type occurs), assuming...
Topics: DTIC Archive, Lory, H J, JOHNS HOPKINS UNIV BALTIMORE MD CARLYLE BARTON LAB, *ELECTRIC CONTACTS,...
