Pressure induced Ag{sub 2}Te polymorphs in conjunction with topological non trivial to metal transition
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
- Department of Geosciences, University of New York at Stony Brook (United States)
- Department of Physics, Beijing Institute of Technology, Beijing (China)
- High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154 (United States)
Silver telluride (Ag{sub 2}Te) is well known as superionic conductor and topological insulator with polymorphs. Pressure induced three phase transitions in Ag{sub 2}Te have been reported in previous. Here, we experimentally identified high pressure phase above 13 GPa of Ag{sub 2}Te by using high pressure synchrotron x ray diffraction method in combination with evolutionary crystal structure prediction, showing it crystallizes into a monoclinic structure of space group C2/m with lattice parameters a = 6.081Å, b = 5.744Å, c = 6.797 Å, β = 105.53°. The electronic properties measurements of Ag{sub 2}Te reveal that the topologically non-trivial semiconducting phase I and semimetallic phase II previously predicated by theory transformed into bulk metals for high pressure phases in consistent with the first principles calculations.
- OSTI ID:
- 22611436
- Journal Information:
- AIP Advances, Vol. 6, Issue 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2158-3226
- Country of Publication:
- United States
- Language:
- English
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