High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet
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High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet. / N. Taran, Michail; Nestola, Fabrizio; Ohashi, Haruo; Koch-Müller, Monika; Balic Zunic, Tonci; Olsen, Lars Arnskov.
In: American Mineralogist, Vol. 92, 2007, p. 1616–1623.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - High-pressure optical spectroscopy and X-ray diffraction studies on synthetic cobalt aluminum silicate garnet
AU - N. Taran, Michail
AU - Nestola, Fabrizio
AU - Ohashi, Haruo
AU - Koch-Müller, Monika
AU - Balic Zunic, Tonci
AU - Olsen, Lars Arnskov
PY - 2007
Y1 - 2007
N2 - 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. Datafromsingle-crystalX-raydiffractionData 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 a-isostructural polymorph of Co3Al2Si3O12.
AB - 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. Datafromsingle-crystalX-raydiffractionData 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 a-isostructural polymorph of Co3Al2Si3O12.
KW - Faculty of Science
KW - High-pressure optical spectroscopy
KW - phase transitions
KW - cobalt-bearing garnet
KW - high-pressure X-ray diffraction
M3 - Journal article
VL - 92
SP - 1616
EP - 1623
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
ER -
ID: 1614366