X-ray single-crystal and optical spectroscopic study of chromian pumpellyite from Sarany, Urals, Russia
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概要
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The crystal structure of a chromian pumpellyite K0.03Na0.07Ca7.82Mn2+0.01Mg1.95Fe3+0.05V3+0.01Cr3+3.77Al6.52Ti0.02Si11.82O42.06(OH)13.94 (Z = 1) from Sarany in the Russian Urals was studied using optical spectroscopy and single-crystal X-ray diffraction methods. Five discrete peaks were observed in an optical spectrum. Of these, three at 392(υ2), 574(υ1) and 726 nm were attributed to Cr3+; one at 456 nm to Fe3+; and a peak at 291 nm is related to M-O charge transfer. The crystal field parameters determined here (B, C and 10Dq) give 94% ionic character of Cr-O bonds and a mean VIM-O distance of 1.954 Å. The crystal structure of chromian pumpellyite with a = 8.809(3), b = 5.9330(9), c = 19.137(1) Å, β = 97.606(2)° at 90 K, and a = 8.807(6), b = 5.943(4), c = 19.18(1) Å, β = 97.44(2)° at 293 K was refined using 1297 unique reflections measured at 90 K, converging at R = 2.3%. Site occupancies of the main constituent elements at the two independent octahedral X and Y sites are X = 0.49Mg + 0.308Cr + 0.202Al and Y = 0.742Al + 0.258Cr. Although Cr3+ ions occupy both the X and Y sites, the site preference of chromium for the X site is stronger than that for the Y site, as indicated by the distribution coefficient of chromium between the X and Y sites, KD = (Cr/Al)X/(Cr/Al)Y, of 4.39. The substitution of Cr3+ for Al in the Y site directly results in structural changes, whereas that in the X site is not effective for structural change.
- 2010-08-01
著者
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NAGASHIMA Mariko
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern
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AKASAKA Masahide
Department of Geoscience, Faculty of Science and Engineering, Shimane University
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IKEDA Ko
Department of Advanced Materials Science and Engineering, Yamaguchi University
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KYONO Atsushi
Division of Earth Evolution Sciences, Graduate School of Life and Environmental Sciences, University
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MAKINO Kuniaki
Department of Geology, Shinshu University
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Kyono Atsushi
Division Of Earth Evolution Sciences Graduate School Of Life And Environmental Sciences University O
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Makino Kuniaki
Dep. Of Geological Sciences Fac. Of Sci. Shinshu Univ.
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Makino Kuniaki
Department Of Geological Sciences Faculty Of Science Shinshu University
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Akasaka Masahide
Department Of Materials Creation And Circulation Technology Graduate School Of Science And Engineeri
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Akasaka Masahide
Department Of Geoscience Faculty Of Science And Engineering Shimane University
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Ikeda Ko
Department Of Advanced Materials Science And Engineering Yamaguchi University
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Nagashima Mariko
Mineralogical Crystallography Inst. Of Geological Sciences Univ. Of Bern
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