Pressure-induced order–disorder transitions in pyrochlore RE2Ti2O7 (RE=Y, Gd)

Structural evolution of pyrochlore titanates Y2Ti2O7 and Gd2Ti2O7 at high pressure was investigated with Raman spectroscopy and XRD. Pressure-induced order-disorder transitions were found in titanate pyrochlores. The cations and anions in Y2Ti2O7 began to be disordered at pressures > 50 GPa and t...

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Published inMaterials letters Vol. 60; no. 21-22; pp. 2773 - 2776
Main Authors Zhang, F X, Manoun, B, Saxena, S K
Format Journal Article
LanguageEnglish
Published 01.09.2006
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Summary:Structural evolution of pyrochlore titanates Y2Ti2O7 and Gd2Ti2O7 at high pressure was investigated with Raman spectroscopy and XRD. Pressure-induced order-disorder transitions were found in titanate pyrochlores. The cations and anions in Y2Ti2O7 began to be disordered at pressures > 50 GPa and the structure changed from pyrochlore (Fd-3m) to defect fluorite structure (Fm-3m) A4O7. This transition was not stable in Gd2Ti2O7, and amorphisation proceeded at pressure > 32 GPa. 30 refs.
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ISSN:0167-577X
DOI:10.1016/j.matlet.2006.01.095