Natural specimen of triple solid solution ettringite–thaumasite–chromate-ettringite
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- 作者：V. A. Drebushchak ; Yu V. Seryotkin…
- 关键词：Chromate species ; Ettringite group ; Solid solution ; Structure refinement ; TG
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2013
- 出版时间：November 2013
- 年：2013
- 卷：114
- 期：2
- 页码：777-783
- 全文大小：410KB
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Yu V. Seryotkin (1) (2)
Svetlana N. Kokh (1)
Ella V. Sokol (1)
1. Institute of Geology and Mineralogy SB RAS, Pr. Ak. Koptyuga 3, 630090, Novosibirsk, Russia
2. Novosibirsk State University, Ul. Pirogova 2, 630090, Novosibirsk, Russia - ISSN：1572-8943
文摘
Three natural minerals of ettringite group were investigated by TG to refine their chemical composition. Two samples are ettringite Ca5.97Mg0.01Sr0.02Al1.99Cr0.01(SO4)3(OH)12·23.7H2O and bentorite Ca5.99Mg0.01Cr1.95Al0.01Si0.03(SO4)2.82·(CO3)0.20(OH)12·19.4H2O, but the third one Ca5.99Na0.01Al1.38Si0.62(SO4)2.49·(CrO4)0.36·(CO3)0.46(OH)12·15.8H2O has found to be a solid solution among ettringite, thaumasite, and chromate-ettringite, not registered yet as a new mineral species. Similar phase is well known in concrete formed with Cr6+ admixture, but is found for the first time as a natural compound. X-ray single-crystal investigation allowed us to refine the structure and support substitution (SO4)2?/sup>???CrO4)2?/sup> in natural minerals of ettringite group.