| Crystal Chemistry of Iron in Non-Metamict Chevkinite-（Ce） ：Valence State and Site Occupation Proportions |
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| 引用本文： | 杨主明,李禾,刘密兰,Franz Pertlik. Crystal Chemistry of Iron in Non-Metamict Chevkinite-（Ce） ：Valence State and Site Occupation Proportions[J]. 中国稀土学报(英文版), 2007, 25(2): 238-242. DOI: 10.1016/S1002-0721(07)60080-5 |
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| 作者姓名： | 杨主明 李禾 刘密兰 Franz Pertlik |
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| 作者单位： | Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences，Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences，Analysis Test Center Jilin University，Institute of Mineralogy and Crystallography University of Vienna Geozentre Althanstrasse 14 A-1090 Vienna Austria，Beijing 100029 China，Beijing 100029 China，Changchun 130021 China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （40572029）Acknowledgements： We thank Prof. Dr Evgueni Semenov for presenting the sample of metamict chevkinite-（Ce） from the Ilmen Mountains, Urals, Russia. We are grateful to Prof. Li Zhe for his help on the experimental preparation. |
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| 摘 要： | Chevkiniteis one of the commonrare earth acces-sory minerals found in a wide occurrence of paragene-sis . About80analyses of samples in the chevkinitegroup have beenreportedto contain FeO(assuming∑Fe as FeO) rangingfrom7.11%to16·88%[1].How-ever ,in mine…
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| 关 键 词： | 非蜕晶质 硅钛酸铈钇矿型 铈离子 晶体化学 价态 键长 取代位 |
| 文章编号： | 1002-0721（2007）02-0238-05 |
| 收稿时间： | 2006-06-16 |
| 修稿时间： | 2006-08-15 |
Crystal Chemistry of Iron in Non-Metamict Chevkinite-(Ce): Valence State and Site Occupation Proportions |
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| Zhuming , He Li, Milan Liu,Pertlik Franz. Crystal Chemistry of Iron in Non-Metamict Chevkinite-(Ce): Valence State and Site Occupation Proportions[J]. Journal of Rare Earths, 2007, 25(2): 238-242. DOI: 10.1016/S1002-0721(07)60080-5 |
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| Authors: | Zhuming He Li Milan Liu Pertlik Franz |
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| Affiliation: | aKey Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;bAnalysis Test Center, Jilin University, Changchun 130021, China;cInstitute of Mineralogy and Crystallography, University of Vienna, Geozentre, Althanstrasse 14, A-1090 Vienna, Austria |
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| Abstract: | The ideal formula for chevkinite can be expressed as A4BC2D2Si4O22. It is important to determine the valence state and site occupation proportions for Fe among the B, C, and D octahedral sites as it may help to identify different species in the chevkinite group. Non-metamict chevkinite-(Ce) from Mianxi alkali feldspar-granite, Sichuan Province, China, was investigated using Mössbauer spectroscopy. The Fe3+/ΣFe ratio was 39.2%. A significant increase of Fe3+ occured during metamictization and annealing for chevkinite-group minerals. In metamict samples Fe tended to lower coordination. According to the correlation between bond length and isomer shift (IS), the quadrupole doublets with IS = 1.10 and 0.94 mm·s−1 can be assigned to Fe2+ in the B and C octahedral sites, respectively. Based on the correlation between octahedral distortion and quadrupole splitting (QS), the quadrupole doublets with QS = 0.86 and 0.77 mm·s−1 can be assigned to Fe3+ in the C and D sites, respectively. The simplified formula can be revised as: Ce4Fe2+ (Ti, Fe2+, Fe3+)2(Ti, Fe3+)2Si4(O, OH)22. It indicated that the non-metamict chevkinite-(Ce) belonged to Fe2+ end member of the chevkinite group because Fe2+ was the predominant component in the B site. |
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| Keywords: | Chevkinite-(Ce), Mö ssbauer spectroscopy valence state bond length rare earths |
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