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Pressure-induced phase transitions, amorphization and alloying in Sb2S3
Cheng Hu1, Yixuan Xu1,2, Yu Gong1
1Multidiscipline Research Center, Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, China. hucheng@ihep.ac.cn.
Physical Chemistry Chemical Physics : PCCP
|April 13, 2022
Summary
Antimony trisulfide (Sb2S3) exhibits complex pressure-induced phase transitions and amorphization. Its unique behavior under pressure suggests potential as a high-pressure thermoelectric material.
Area of Science:
- Materials Science
- Solid State Physics
- Geophysics
Background:
- Sesquichalcogenides are extensively studied for pressure-induced phase transitions.
- Puzzles remain regarding the behavior of binary semiconductors like antimony trisulfide (Sb2S3) under pressure.
Purpose of the Study:
- To investigate the complex phase transitions, amorphization, and alloying behaviors of antimony trisulfide (Sb2S3) under high pressure.
- To understand the influence of pressure-transmitting media on these phenomena.
Main Methods:
- In situ high-pressure angle-dispersive X-ray diffraction.
- Raman spectroscopy.
- Electrical resistance measurements.
Main Results:
- Sb2S3 undergoes two phase transitions before forming a high-density amorphous state (HDA).
- The pressure-transmitting medium significantly affects the observed transitions.
- An irreversible process occurs upon decompression, yielding a low-density amorphous state (LDA).
- Recompressing LDA unexpectedly forms a site-disordered Sb-S alloy.
Conclusions:
- High pressure destroys the Sb3+ lone electron pair activity in Sb2S3.
- This pressure-induced modification suggests Sb2S3's potential as a thermoelectric material under high-pressure conditions.
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