Polymorphs of alumina predicted by first principles: Putting pressure on the ruby pressure scale

Kendall T. Thomson, Renata M. Wentzcovitch, Mark S T Bukowinski

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

Fully optimized quantum mechanical calculations indicate that Al2O3 transforms from the corundum structure to the as yet unobserved Rh2O3 (II) structure at about 78 gigapascals, and it further transforms to Pbnm- perovskite structure at 223 gigapascals. The predicted x-ray spectrum of the Rh2O3 (II) structure is similar to that of the corundum structure, suggesting that the Rh2O3 (II) structure could go undetected in high- pressure x-ray measurements. It is therefore possible that the ruby (Cr3+- doped corundum) fluorescence pressure scale is sensitive to the thermal history of the ruby chips in a given experiment.

Original languageEnglish (US)
Pages (from-to)1880-1882
Number of pages3
JournalScience
Volume274
Issue number5294
DOIs
StatePublished - Dec 13 1996

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