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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

Online
ISSN
1945-3027
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Volume 92, Issue 10

Issues

High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet

Michail N. Taran
  • Corresponding author
  • Institute of Geochemistry, Mineralogy and Ore Formation, National Academy of Sciences of Ukraine, Paladin Avenue 34, 03680 Kyiv-142, Ukraine
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/ Fabrizio Nestola / Haruo Ohashi / Monika Koch-Müller / Tonci Balic-Zunic
  • Geological Institute, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, Denmark
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/ Lars Arnskov Olsen
  • Geological Institute, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, Denmark
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Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2007.2457

Abstract

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, 17 680, and 18 740 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 β- to α-isostructural polymorph of Co3Al2Si3O12.

Keywords: High-pressure optical spectroscopy; high-pressure X-ray diffraction; cobalt-bearing garnet; phase transitions

About the article

Received: 2006-09-21

Accepted: 2007-06-03

Published Online: 2015-04-01

Published in Print: 2007-10-01


Citation Information: American Mineralogist, Volume 92, Issue 10, Pages 1616–1623, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2007.2457.

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