Novel pressure-induced phase transformations in hydrous layered materials

Details Novel pressure-induced phase transformations in hydrous layered materials Novel pressure-induced phase transformations in hydrous layered materials

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29p..17j&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 16, pp. 17-1, CiteID 1770, DOI 10.1029/2002GL015402

Physics

2

Mineralogy, Petrology, And Mineral Physics: Crystal Chemistry, Mineral Physics: High-Pressure Behavior, Mineral Physics: Optical, Infrared, And Raman Spectroscopy, Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction

Scientific paper

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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