High-pressure behavior of anorthite; compression and amorphization

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doi: 10.1029/97JB00398
Authors:Daniel, Isabelle; Gillet, Philippe; McMillan, Paul F.; Wolf, George; Verhelst, Mary A.
Author Affiliations:Primary:
École Normale Supérieure de Lyon and Université Claude Bernard Lyon I, Laboratoire de Sciences de la Terre, Villeurbanne, France
Arizona State University, United States
Volume Title:Journal of Geophysical Research
Source:Journal of Geophysical Research, 102(B5), p.10,313-10,325. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0148-0227
Publication Date:1997
Note:In English. 86 refs.; illus., incl. 3 tables
Summary:Detailed studies of the high-P behaviour of anorthite between ambient P and 30 GPa under static conditions, using in situ Raman spectroscopy and energy-dispersive XRD, show three transitions with increasing P. Above 16 GPa, anorthite is fully amorphous. However, only samples pressurized to >><[dollar]I> 22 GPa remain amorphous on recovery to ambient conditions. The high-P behaviour of anorthite is highly sensitive to deviatoric stresses. Calculations show that the free energies of the crystalline and amorphous materials are equal at ∼ 30 GPa. [R.H.N.]
Subjects:Amorphous materials; Anorthite; Compression; Crystal structure; Feldspar group; Framework silicates; High pressure; Hydrostatic pressure; Plagioclase; Polymorphism; Pressure; Raman spectra; Silicates; Spectra; Symmetry; Thermodynamic properties; Transformations; X-ray diffraction data; Amorphization
Abstract Numbers:98M/356
Record ID:1997056251
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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