Thermodynamics of arsenates, selenites, and sulfates in the oxidation zone of sulfide ores. X. thermal stability and dehydration features of synthetic analogs of the cobaltomenite–ahlfeldite solid solution series
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- 作者：M. V. Charykova ; E. L. Fokina ; V. G. Krivovichev…
- 刊名：Geology of Ore Deposits
- 出版年：2015
- 出版时间：December 2015
- 年：2015
- 卷：57
- 期：7
- 页码：570-578
- 全文大小：1,552 KB
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E. L. Fokina (1)
V. G. Krivovichev (1)
O. S. Yakovenko (1)
E. V. Klimova (1)
V. V. Semenova (1)
1. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia - 刊物主题：Mineral Resources;
- 出版者：Springer US
- ISSN：1555-6476
文摘
The aim of this study is the experimental investigation of the synthetic analogs of cobaltomenite, CoSeO3 • 2H2O, ahlfeldite, NiSeO3 • 2H2O, members of the cobaltomenite–ahlfeldite solid solution series (Ni x Co1–x )SeO3 • 2H2O, and singularities of their dehydration and dissociation. The intermediate members of the cobaltomenite (CoSeO3 • 2H2O)–ahlfeldite (NiSeO3 • 2H2O) series have been synthesized and studied with a combination of X-ray diffraction, scanning electron microscopy, and the simultaneous application of thermogravimetry (TG) and differential scanning calorimetry (DSC) within the temperature range from 25 to 640°C. The complete solid solution series corresponds to the monoclinic space group P21/n. Unit-cell dimensions decrease in all crystallographic directions as the amount of Ni increases. The angle β increases from 98.82(1) (cobaltomenite) to 99.05(1)° (ahlfeldite). It has been established that CoSeO3 • 2H2O and NiSeO3 • 2H2O dehydrate at 120–340°C through two stages apparently corresponding, to the formation of intermediate hydrated species CoSeO3 • H2O and NiSeO3 • 1/3H2O. The reaction enthalpies for each dehydration stage of CoSeO3 • 2H2O and NiSeO3 • 2H2O have been determined. Changes of the unit-cell dimensions and dehydration temperatures are rationalized in terms of the Co and Ni site occupancy in the structure of the cobaltomenite–ahlfeldite solid-solution series members.