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

Michail N. Taran; Fabrizio Nestola; Haruo Ohashi; Monika Koch-Müller; Tonci Balic Zunic; Lars Arnskov Olsen

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

Michail N. Taran, Fabrizio Nestola, Haruo Ohashi, Monika Koch-Müller, Tonci Balic Zunic, Lars Arnskov Olsen

7 Citations (Scopus)

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. 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.

Original language	English
Journal	American Mineralogist
Volume	92
Pages (from-to)	1616–1623
ISSN	0003-004X
Publication status	Published - 2007

Keywords

Faculty of Science
High-pressure optical spectroscopy
phase transitions
cobalt-bearing garnet
high-pressure X-ray diffraction

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@article{b58c7db09e5e11dcbee902004c4f4f50,

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

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. 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.",

keywords = "Faculty of Science, High-pressure optical spectroscopy, phase transitions, cobalt-bearing garnet, high-pressure X-ray diffraction",

author = "{N. Taran}, Michail and Fabrizio Nestola and Haruo Ohashi and Monika Koch-M{\"u}ller and {Balic Zunic}, Tonci and Olsen, {Lars Arnskov}",

year = "2007",

language = "English",

volume = "92",

pages = "1616–1623",

journal = "American Mineralogist",

issn = "0003-004X",

publisher = "Mineralogical Society of America",

}

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

SN - 0003-004X

VL - 92

SP - 1616

EP - 1623

JO - American Mineralogist

JF - American Mineralogist

ER -

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

Abstract

Keywords

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