A study of tantalum pentoxide Ta2O5 structures up to 28 GPa

Elissaios Stavrou, Joseph M. Zaug, Sorin Bastea, Martin Kunz

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Abstract

Tantalum pentoxide Ta2O5 with the orthorhombic L-Ta2O5 structure has been experimentally studied up to 28.3 GPa (at ambient temperature) using synchrotron angle-dispersive powder X-ray diffraction (XRD). The ambient pressure phase remains stable up to 25 GPa where with increased pressure a crystalline to amorphous phase transition occurs. A detailed equation of state (EOS), including pressure dependent lattice parameters, is reported. The results of this study were compared with a previous high-pressure XRD study by Li et al. A clear discrepancy between the ambient-pressure crystal structures and, consequently, the reported EOSs between the two studies was revealed. The origin of this discrepancy is attributed to two different crystal structures used to index the XRD patterns.

Original languageEnglish
Article number175901
JournalJournal of Applied Physics
Volume121
Issue number17
DOIs
StatePublished - 7 May 2017
Externally publishedYes

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