Affiliation:
1. Department of Geology and Geophysics, University of California, Berkeley, CA 94720–4767, USA.
Abstract
X-ray diffraction measurements indicate that ruby (Cr
3+
doped α-Al
2
O
3
) transforms to the Rh
2
O
3
(II) structure when heated to temperatures exceeding ∼1000 kelvin at pressures above ∼100 gigapascals, in agreement with predictions from ab initio quantum mechanical calculations. The high-pressure phase did not quench upon decompression to ambient pressure, and the occurrence of this phase transformation may affect interpretations of static (diamond-anvil cell) and dynamic (shock-wave) experiments at ultra-high pressures.
Publisher
American Association for the Advancement of Science (AAAS)
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