Spontaneous strain below the I\bar 1 - P\bar 1 transition in anorthite at pressure期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Spontaneous strain below the I\bar 1 - P\bar 1 transition in anorthite at pressure

Authors:	R J Angel S A T Redfern N L Ross

Institution:	1. Geophysical Laboratory, Carnegie Institution of Washington, 2801 Upton St., NW, 20008, Washington, DC, USA 3. Department of Earth Sciences, University of Cambridge, Downing Street, CB2 3EQ, Cambridge, England

Abstract:	The phase transition between the $P\bar 1$ and $I\bar 1$ phases of anorthite has been studied at elevated pressure by single-crystal X-ray diffraction in a diamond-anvil cell. The phase transition is shown to be first-order in character for both end-member anorthite (CaAl₂Si₂O₈) and for an anorthite with a small amount of albite component (NaAlSi₃O₈) in solid solution. Reversals of the transition across the phase boundary at three other compositions show that the transition pressure (P _Tr) increases with increasing albite content. This behaviour is compared with that observed at elevated temperatures, and is analysed in terms of Landau theory.

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