Distribution of Fe^<3+> in a synthetic (Ca, Na)_2 (Mg, Fe^<3+>) Si_2O_7-melilite : ^<57>Fe Mossbauer and X-ray Rietveld studies
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概要
- 論文の詳細を見る
Crystal structure and the 57Fe Mössbauer spectrum of synthetic (Ca1.53Na0.47)(Mg0.52Fe3+0.49)Si1.99O7-melilite have been investigated to confirm the location of Fe3+ at the T1 site, and to evaluate the effect of an incommensurate structure on 57Fe Mössbauer hyperfine parameters. A conventional Rietveld refinement with occupancies of Ca(W), Na(W), Mg(T1), Fe3+(T1) and Si(T2) fixed to 0.765, 0.235, 0.515, 0.485 and 2.00, respectively, converged well with an Rwp (R-weighted pattern) of 13.14% and a goodness-of-fit of 1.337, indicating exclusive Fe3+ distribution at the T1 site. However, the Mössbauer spectrum consists of two doublets with an isomer shift of 0.19 mm/s and quadrupole splitting of 0.75 and 1.04 mm/s, which can be attributed to Fe3+ at the T1 site. There are two sorts of T1 site with distinguishable distortion in the synthetic Na-Fe3+-melilite, which might be attributed to the existence of an incommensurate phase at room temperature.
- 日本鉱物科学会の論文
- 2005-12-01
著者
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AKASAKA Masahide
Department of Geoscience, Faculty of Science and Engineering, Shimane University
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MAKINO Kuniaki
Department of Geology, Shinshu University
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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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Nagashima Mariko
Department Of Materials Creation And Circulation Technology Interdisciplinary Graduate School Of Sci
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Nagashima Mariko
Department Of Materials Creation And Circulation Technology Graduate School Of Science And Engineeri
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Nagashima Mariko
Mineralogical Crystallography Inst. Of Geological Sciences Univ. Of Bern
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Nagashima Mariko
Department Of Earth Science Graduate School Of Science And Engineering Yamaguchi University
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