Journal of Research of the National Bureau of Standards
A pressure-temperature (P-T) section of the phase equilibrium diagram for Nb2O5 has been determined. Four single phase regions, H-Nb2O5, B-Nb2O5, and two L-Nb2O5 areas, were characterized by x-ray powder diffraction data. The superstructure of L-Nb2O5 was indexed on the basis of similarities to the known superstructures of L-Ta2O5 and confirmed with single crystal electron diffraction data. The correct unit cell is orthorhombic with a = 6.168, b = 29.312 , c = 3.938 �, with the b axis 8 times the subcell (8 X 3.664 �).
J. Res. Nat. Bur. Stand. Sec. A: Phys. Ch., Vol. 77A, No. 6, p. 705
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