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Title: Preference for a pressure-induced 3D structure after 1T-HfSe2

Journal Article · · Materials Today Physics

Extensive crystal structure prediction searches provide evidence of two 3D structures with orthorhombic (Immm) and monoclinic (C2/m) space groups as reasonable candidates for the first pressure-induced phase of 1T-HfSe2. Our candidates are compared with two recent proposals that keep the 2D nature of the ambient conditions phase and display hexagonal (P63/mmc) and monoclinic (C2/m) symmetry, although the latter has a different structure than our proposed C2/m phase. Both of these 2D-like structures are discarded based on simple thermodynamic and kinetic arguments that can be extended to explain the pressure-induced polymorphic sequence of other transition metal dichalcogenides. The computed observables of our orthorhombic phase are fully consistent with the experimental structural and Raman data observed at low and high-pressure.

Research Organization:
Univ. of Illinois, Chicago, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003975
OSTI ID:
1994207
Journal Information:
Materials Today Physics, Vol. 36; ISSN 2542-5293
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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