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. 1966 Jan-Feb;70A(1):5-10.
doi: 10.6028/jres.070A.002.

Phase Equilibria in the System Niobium Pentoxide-Germanium Dioxide

Ernest M Levin

Phase Equilibria in the System Niobium Pentoxide-Germanium Dioxide

Ernest M Levin. J Res Natl Bur Stand A Phys Chem. 1966 Jan-Feb.

Abstract

The phase equilibrium diagram for the system Nb2O5-GeO2 has been determined experimentally, using the quenching technique and examining the samples by optical microscopy and x-ray powder diffractometry. The system contains one compound, 9Nb2O5·GeO2, which melts incongruently at 1420 °C. A eutectic between this compound and GeO2 is located at about 97 mol percent GeO2 and 1090 °C. The system does not show liquid immiscibility, and it is concluded that the ionic field strength limit for two-liquid separation in the series of glass formers occurs with the Nb+5 cation.

Keywords: Germanium dioxide; immiscibility; niobium pentoxide; phase equilibria.

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Figures

Figure 1.
Figure 1.
Phase equilibrium diagram for the system Nb2O5–GeO2. ● –No melting; ◐ –partial melting; ○ –complete melting. H–Nb2O5–High-temperature form of Nb2O5. H–GeO2–Quartz form of GeO2.
See this image and copyright information in PMC

References

    1. Levin E. M., Robbins C. R., and McMurdie H. F., Phase Diagrams for Ceramists, The American Ceramic Society, Inc., 601 pp., 2064 figs., Columbus, Ohio.
    1. Ibrahim M. and Bright N. F. H., J. Am. Ceram. Soc. 45, [5], 221–222 (1962).
    1. Waring J. L. and Roth R. S., J. Res. NBS 69A (Phys. and Chem.) No. 2, 119–129(1965). - PMC - PubMed
    1. Levin E. M., J. Am. Ceram. Soc. 48, [9] 491–492 (1965).
    1. Levin E. M., Robbins C. R., and Waring J. L., J. Am. Ceram. Soc. 44 [2], 87–91 (1961).
    2. Levin E. M. and McDaniel C. L., J. Am. Ceram. Soc. 45 [8],355–360 (1962).

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