Pressure-induced amorphization and reduction of T-Nb2O5

George C. Serghiou, Robert R. Winters, William S. Hammack

Research output: Contribution to journalArticlepeer-review

Abstract

Energy dispersive x-ray diffraction measurements show that the T phase of Nb2O5 becomes x-ray amorphous at a pressure of 19.2 GPa at 300 K. This pressure-induced amorphization is novel since the oxide is simultaneously reduced as it becomes amorphous. The amorphization occurs because the pressure-induced reduction T-Nb2O5→crystalline Nb12O29 is kinetically impeded. A consideration of the ambient pressure atomic mechanism of the oxidation of NbOx compounds (x<2.5) suggests that the pressure-induced amorphous state is formed by oxygen defects in the T-Nb2O5 lattice.

Original languageEnglish (US)
Pages (from-to)3311-3314
Number of pages4
JournalPhysical review letters
Volume68
Issue number22
DOIs
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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