Pressure-induced structural phase transition and dehydration for gypsum investigated by Raman spectroscopy and electrical conductivity

被引：13
作者：
Yang, Linfei [1 ,2 ]
Dai, Lidong [1 ]
Li, Heping [1 ]
Hu, Haiying [1 ]
Zhuang, Yukai [1 ,2 ]
Liu, Kaixiang [1 ,2 ]
Pu, Chang [1 ,2 ]
Hong, Meiling [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Guizhou, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
CHEMICAL PHYSICS LETTERS | 2018年 / 706卷
关键词：
Gypsum; Dehydration; Raman spectroscopy; Electrical conductivity; Phase diagram; High pressure; HIGH-TEMPERATURE;
D O I：
10.1016/j.cplett.2018.06.007
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The structural phase transition and dehydration for gypsum were investigated by Raman spectroscopy and electrical conductivity up to similar to 12.2 GPa and similar to 723 K. A similar to 5.8 GPa of phase transition was verified at atmospheric temperature. The variations in the sulfate and hydroxyl Raman shifts and a change in electrical conductivity marked the onset of dehydration. At similar to 2.5 GPa, gypsum transformed into bassanite at similar to 523 K, and then completely dehydrated to c-anhydrite at similar to 673 K. And furthermore, the gypsumbassanite and bassanite-anhydrite dehydration boundaries were obtained: P (GPa) = -23.708 + 0.050 T (K) and P (GPa) = -4.907 + 0.011 T (K), respectively. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：151 / 157
页数：7
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