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Ti(III) in synthetic pyrope; a single-crystal electron paramagnetic resonance study

Helmut Rager, Charles A. Geiger and Andreas Stahl
Ti(III) in synthetic pyrope; a single-crystal electron paramagnetic resonance study
European Journal of Mineralogy (August 2003) 15 (4): 697-699

Abstract

Electron paramagnetic resonance measurements were undertaken on a synthetic Ti-bearing pyrope single crystal of approximate composition Mg (sub 3.01(2)) Al (sub 1.93(2)) Ti (sub 0.04(1)) Si (sub 3.00(2)) O (sub 12) in order to further (Geiger et al., 2000) characterize the oxidation state of titanium. The crystal was synthesized hydrothermally at high pressure and temperature and starting with Ti (sub 2) O (sub 3) . The angular dependence of the observed EPR spectrum can uniquely be interpreted as being due to an electron centre with spin 1/2 on a site of 3 point symmetry. It is proposed, based on the composition of the pyrope and its known structure, that the EPR spectrum results from a small concentration of Ti(III) on the octahedral 16a site. Based on previously published optical absorption measurements and microprobe analysis, most of the octahedral Ti should be in the oxidation state (IV).


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 4
Title: Ti(III) in synthetic pyrope; a single-crystal electron paramagnetic resonance study
Affiliation: Universitaet Marburg, Fachbereich Geowissenschaften, Marburg, Federal Republic of Germany
Pages: 697-699
Published: 200308
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 14
Accession Number: 2003-070560
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Universitaet Kiel, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200321
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