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November 1, 1973Journal of Research of the National Bureau of Standards Section A Physics and Chemistry

Temperature-pressure phase relationships in niobium pentoxide

J.L. Waring R.S. Roth H.S. Parker

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Abstract

A press ure-te mperature (P-T) section of th e phase equilibrium diagram for Nb,O, has bee n determined.Four sin gle phase regions, H-Nb,O" B-N b20" and two L-Nb20, areas, were characteri zed by x-ray powder diffracti on data.The superstru cture of L-Nb,O, w! indexed on the basis of similarities to the known superstructures of L-Ta,O, and confirmed with single crystal electron diffraction data_The correct unit cell is orthorhombic with a=6 .168,b =29.3 12 , c=3.938 A, with the b axis 8 times the subcell (8 x 3.664 A).

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Waring et al. (1973) studied this question.

synapsesocial.com/papers/6a71633678a11c550e0b7494 https://doi.org/10.6028/jres.077a.042

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