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Meeting Materials Science & Technology 2020
Symposium Thermodynamics of Materials in Extreme Environments
Presentation Title Pressure-induced Anomalous Phase Transition Behavior in Layered Tellurene
Author(s) Arunima K. Singh, Han Li, Kedi Wu, Sijie Yang, Tara Boland, Bin Chen, Sefaattin Tongay
On-Site Speaker (Planned) Arunima K. Singh
Abstract Scope Recent studies have demonstrated that tellurene is a van der Waals two-dimensional material with potential optoelectronic and thermoelectric applications as a result of its pseudo-one-dimensional structure. Using density-functional theory simulations and experimental characterization of high quality single crystalline Te nanoribbons we find that Te undergoes a pressure-dependent phase transition with a large pressure hysteresis and with multiple competing phases [1]. During compression, a phase transition from the trigonal to the orthorhombic phase occurs at 6.5 GPa and is sudden. In contrast, a gradual phase transition occurs during decompression, where its orthorhombic and trigonal phases co-exist between 6.9 to 3.4 GPa. Grüneisen parameter calculations further confirm the presence of co-existing phases and suggest hysteretic phase change behavior. [1] Nanoscale 11, no. 42 (2019): 20245-20251.


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