X-ray single-crystal and optical spectroscopic study of chromian pumpellyite from Sarany, Urals, Russia
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- NAGASHIMA Mariko
- Mineralogical Crystallography, Institute of Geological Sciences, University of Bern Department of Materials Creation and Circulation Technology, Graduate School of Science and Engineering, Shimane University
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- AKASAKA Masahide
- Department of Materials Creation and Circulation Technology, Graduate School 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 of Tsukuba
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- MAKINO Kuniaki
- Department of Geology, Shinshu University
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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.
収録刊行物
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- Journal of Mineralogical and Petrological Sciences
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Journal of Mineralogical and Petrological Sciences 105 (4), 187-193, 2010
一般社団法人 日本鉱物科学会
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詳細情報
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- CRID
- 1390282681522041216
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- NII論文ID
- 10026643831
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- NII書誌ID
- AA11460926
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- ISSN
- 13493825
- 13456296
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- CiNii Articles
- KAKEN
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- 使用不可