Novel pressure‐induced phase transformations in hydrous layered materials
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- Cliff T. Johnston
- ESEI Purdue University West Lafayette IN USA
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- Shan‐Li Wang
- ESEI Purdue University West Lafayette IN USA
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- David L. Bish
- Geology and Geochemistry Los Alamos National Laboratory Los Alamos NM USA
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- Przemyslaw Dera
- Geophysical Laboratory Carnegie Institution of Washington Washington, D.C. USA
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- Stephen F. Agnew
- Archimedes Technology Group, Inc. San Diego CA USA
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- John W. Kenney
- Chemical Physics Laboratory Concordia University Irvine CA USA
抄録
<jats:p>High‐pressure Raman and X‐ray diffraction data on single crystals of hydrous layer‐structure minerals, dickite and gibbsite, reveal structural phase transitions occurring between 2.0 and 2.5 GPa. In the case of dickite, this is the first documented occurrence of a pressure‐induced phase transformation in a 1:1 phyllosilicate. Above the transition the structure of individual 1:1 layers remains unchanged, whereas the stacking of individual layers and the interlayer topology change significantly. Similar to dickite, single‐crystal Raman spectra of gibbsite show large perturbations in the <jats:italic>v</jats:italic>(OH) region and suggest that the interlayer OH groups play a critical role in the phase transformation.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 29 (16), 2002-08-15
American Geophysical Union (AGU)