Transformation in Garnet from Orthorhombic Perovskite to LiNbO 3 Phase on Release of Pressure-Reference-Cited by-同舟云学术

Transformation in Garnet from Orthorhombic Perovskite to LiNbO 3 Phase on Release of Pressure

Published:1997-01-24 Issue:5299 Volume:275 Page:513-515
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Funamori Nobumasa¹,Yagi Takehiko¹,Miyajima Nobuyoshi²,Fujino Kiyoshi²

Affiliation:

1. N. Funamori and T. Yagi, Institute for Solid State Physics, University of Tokyo, Minato-ku 106, Japan.

2. N. Miyajima and K. Fujino, Department of Earth and Planetary Sciences, Hokkaido University, Sapporo 060, Japan.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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