Novel pressure-induced phase transformations in hydrous layered materials

被引:46
作者
Johnston, CT [1 ]
Wang, SL
Bish, DL
Dera, P
Agnew, SF
Kenney, JW
机构
[1] Purdue Univ, ESEI, W Lafayette, IN 47907 USA
[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[3] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
[4] Archimedes Technol Grp Inc, San Diego, CA 92121 USA
[5] Concordia Univ, Chem Phys Lab, Irvine, CA 92612 USA
关键词
D O I
10.1029/2002GL015402
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
[1] 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 v(OH) region and suggest that the interlayer OH groups play a critical role in the phase transformation.
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页数:4
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