Temperature-pressure phase relationships in niobium pentoxide

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!\s indexed on the basis of similarities to the known superstructures of L-Ta,O, and confirmed with single crystal electron diffraction data_