Journal of Research of the National Bureau of Standards
The phase-equilibrium diagram for the system Nb2O5 - B2O3 was determined experimentally using the quenching technique and examining the samples by optical microscopy and x-ray powder diffractometry. The system contains one binary compound of approximate composition 3Nb2O5 � B2O3, which melts incongruently at about 1150 �C to H - Nb2O5 and B2O3-rich liquid. A large region of liquid immiscibility extends, at 1352 �C, from 10 mole percent Nb2O5 to 65.7 mole percent Nb2O5. The theoretically calculated extent of immiscibility is in reasonable agreement with the experimentally determined value.
J. Res. Nat. Bur. Stand. Sec. A: Phys. Ch., Vol. 70A, No. 1, p. 11
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