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European Journal of Mineralogy; July, August 2003; v. 15; no. 4; p. 697-699; DOI: 10.1127/0935-1221/2003/0015-0697
© 2003 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Ti(III) in Msynthetic pyrope

: A single-crystal electron paramagnetic resonance study Helmut RAGER1, Charles A. GEIGER2 and Andreas STAHL2

1 Fachbereich Geowissenschaften, Universität Marburg, Hans-Meerwein-Str., D-35032 Marburg, Germany
2 Institut für Geowissenschaften, Universität Kiel, Olshausenstr. 40, D-24098 Kiel, Germany

Corresponding author, e-mail: rager{at}mailer.uni-marburg.de

Electron paramagnetic resonance measurements were undertaken on a synthetic Ti-bearing pyrope single crystal of approximate composition Mg3.01(2)Al1.93(2)Ti0.04(1)Si3.00(2)O12 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 Ti2O3. 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).

Key-words: synthetic pyrope, titanium, EPR..




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[Abstract] [Full Text] [PDF]


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