Prediction of a high-pressure phase transition in Al(2)O(3)

A study predicts a phase transition at high pressure (90 GPa) from the corundum structure to the Rh2O3(II) structure using first-principles calculations with the linearized, augmented plane-wave (LAPW) method. The results show that free Al2O3 in the deep lower mantle is unlikely to be in the form of...

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Bibliographic Details
Published inThe American mineralogist Vol. 79; no. 7-8; p. 789
Main Authors Marton, Frederic C, Cohen, Ronald E
Format Journal Article
LanguageEnglish
Published Washington Walter de Gruyter GmbH 01.08.1994
Subjects
High pressure
Lower mantle
Minerals
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Summary:A study predicts a phase transition at high pressure (90 GPa) from the corundum structure to the Rh2O3(II) structure using first-principles calculations with the linearized, augmented plane-wave (LAPW) method. The results show that free Al2O3 in the deep lower mantle is unlikely to be in the form of corundum, although Al2O3 is probably not sufficiently abundant to give an observable signal in seismological data at the depth of a phase transition.
ISSN:0003-004X
1945-3027