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American Mineralogist; October 2007; v. 92; no. 10; p. 1616-1623; DOI: 10.2138/am.2007.2457
© 2007 Mineralogical Society of America
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High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet

Michail N. Taran1,*, Fabrizio Nestola2, Haruo Ohashi3, Monika Koch-Müller4, Tonci Balic-Zunic5 and Lars Arnskov Olsen5

1 Institute of Geochemistry, Mineralogy and Ore Formation, National Academy of Sciences of Ukraine, Paladin Avenue 34, 03680 Kyiv-142, Ukraine
2 Dipartimento di Geoscienze, Università di Padova, Corso Garibaldi 37, I-35137 Padova, Italy
3 HASHI Institute for Silicate Science, Nishinakanobu 1-9-25, Shinagawa, Tokyo 142-0054, Japan
4 GeoForschungsZentrum, Sektion 4.1, Telegrafenberg, 14473 Potsdam, Germany
5 Geological Institute, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, Denmark

Correspondence: * E-mail: taran{at}igmr.relc.com

The pressure-induced behavior of spin-allowed dd-bands of VIIICo2+ in the absorption spectra of synthetic Co3Al2Si3O12 garnet was studied from 10–4 to 13 GPa. The plots of the peak energy vs. pressure for the three sharpest well resolved bands at ca. 5160, 17680, and 18740 cm–1 display small but discernible breaks in linear relations between 4 and 5 GPa. Data from single-crystal X-ray diffraction likewise show discontinuities in trends of CoO8 polyhedral volume and distortion, and Co-O and Si-O bond distances over this pressure range. These effects are related to a pressure-induced phase transition from the ß- to {alpha}-isostructural polymorph of Co3Al2Si3O12.

Key Words: High-pressure optical spectroscopy • high-pressure X-ray diffraction • cobalt-bearing garnet • phase transitions






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