Transformation in Garnet from Orthorhombic Perovskite to LiNbO 3 Phase on Release of Pressure
- 24 January 1997
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 275 (5299) , 513-515
- https://doi.org/10.1126/science.275.5299.513
Abstract
High-pressure in situ x-ray diffraction and transmission electron microscopy on quenched samples show that natural garnet transforms to orthorhombic perovskite (and minor coexisting phases) containing increasing amounts of aluminum with increasing pressure. This suggests that the perovskite is the dominant host mineral for aluminum in Earth's lower mantle. Orthorhombic perovskite is quenched from ∼35 gigapascals but, because of the increased aluminum content, transforms to the LiNbO 3 structure upon quenching from ∼60 gigapascals.Keywords
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