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High-pressure investigations on the isostructural phase transition and metallization in realgar with diamond anvil cells TEXT SIZE: A A A
The high-pressure structural, vibrational and electrical properties for realgar were investigated by in-situ Raman scattering and electrical conductivity experiments combined with first-principle calculations up to similar to 30.8 GPa. It was verified that realgar underwent an isostructural phase transition at similar to 6.3 GPa and a metallization at a higher pressure of similar to 23.5 GPa. The isostructural phase transition was well evidenced by the obvious variations of Raman peaks, electrical conductivity, crystal parameters and the As-S bond length. The phase transition of metallization was in closely associated with the closure of bandgap rather than caused by the structural phase transition. And furthermore, the metallic realgar exhibited a relatively low compressibility with the unit cell volume V-0 = 718.1.4 angstrom(3) and bulk modulus B-0 = 36.1 GPa.
 

Publication name

 GEOSCIENCE FRONTIERS Volume: 12 Issue: 2 Pages: 1031-1037 DOI: 10.1016/j.gsf.2020.05.017 Published: MAR 2021

Author(s)

 Yang, Linfei; Dai, Lidong; Li, Heping; Hu, Haiying; Hong, Meiling; Zhang, Xinyu; Liu, Pengfei

Corresponding author(s) 

 DAI Lidong 
 dailidong@vip.gyig.ac.cn   
 Chinese Acad Sci, Inst Geochem, Key Lab High Temp & High Pressure Study Earths In, Guiyang 550081, Guizhou, Peoples R China.

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