Phase transformations in the high-temperature form of pure and TiO 2-stabilized Ta2O5

Geoff L. Brennecka, David A. Payne, Pankaj Sarin, J. M. Zuo, Waltraud M. Kriven, Holger Hellwig

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Abstract

The high-temperature forms of undoped tantalum pentoxide (H-100Ta 2O5) and TiO2-modified Ta2O 5 (H-92Ta2O5-8TiO2) were investigated by in situ synchrotron X-ray diffraction and Raman scattering measurements. Two unquenchable and reversible phase transformations were observed in pure H-Ta2O5, while only one was detected for TiO2-stabilized H-Ta2O5. Diffraction studies were consistent with displasive transformations, but hot-stage Raman spectroscopy indicated the existence of transient intermediate forms during the transformations. Use of complementary techniques enabled the reinterpretation of phase transformations in light of a newly proposed crystal structure model for H-Ta2O5,1 and emphasized the structural contributions of the oxygen sublattice.

Original languageEnglish (US)
Pages (from-to)2947-2953
Number of pages7
JournalJournal of the American Ceramic Society
Volume90
Issue number9
DOIs
StatePublished - Sep 1 2007

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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