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As2Te3 transforms from a monoclinic phase α into another monoclinic phase γ under high pressure, with two isostructural phase transitions in phase α at ∼5.09 and ∼13.2 GPa. The pressure-induced structural phase transitions result in the transformation from the original insulator across a semimetal into a metal in As2Te3 upon compression.
In this study, first-principle calculations, in situ angle-dispersive X-ray diffraction, and in situ electrical resistance measurements were performed on arsenic telluride (As2Te3) under high pressure. Structural phase transitions and metallized phenomena were observed from the calculated and experimental results. Upon compression, α-As2Te3 transforms into phases α′ and α″ at ∼5.09 and ∼13.2 GPa, respectively, with two isostructural phase transitions. From 13.2 GPa, As2Te3 starts to transform into phase γ, with one first-order monoclinic to monoclinic crystal structural phase transition. According to the first-principle calculations and electrical resistance measurements, the structural phase transitions in the compression process induce the transformation from an insulator (phase α) across a semimetal (phase α′) into a metal (phases α″ and γ). The evolution of the structure and transport property upon compression on As2Te3 is helpful for understanding the properties of other A2B3-type compounds under high pressure.
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