A study of tantalum pentoxide Ta2O5 structures up to 28 GPa

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

doi:10.1063/1.4982708

A study of tantalum pentoxide Ta₂O₅ structures up to 28 GPa

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

Research output: Contribution to journal › Article › peer-review

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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 language	English
Article number	175901
Journal	Journal of Applied Physics
Volume	121
Issue number	17
DOIs	https://doi.org/10.1063/1.4982708
State	Published - 7 May 2017
Externally published	Yes

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title = "A study of tantalum pentoxide Ta2O5 structures up to 28 GPa",

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.",

author = "Elissaios Stavrou and Zaug, {Joseph M.} and Sorin Bastea and Martin Kunz",

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T1 - A study of tantalum pentoxide Ta2O5 structures up to 28 GPa

AU - Stavrou, Elissaios

AU - Zaug, Joseph M.

AU - Bastea, Sorin

AU - Kunz, Martin

PY - 2017/5/7

Y1 - 2017/5/7

N2 - 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.

AB - 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.

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JO - Journal of Applied Physics

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A study of tantalum pentoxide Ta₂O₅ structures up to 28 GPa

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