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Title: Shear-Induced Isostructural Phase Transition and Metallization of Layered Tungsten Disulfide under Nonhydrostatic Compression

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1]
  1. Washington State Univ., Pullman, WA (United States). Dept. of Chemistry and Inst. of Schock Physics

Pressure-induced structural and electronic transformations of tungsten disulfide (WS2) have been studied to 60 GPa, in both hydrostatic and non-hydrostatic conditions, using four-probe electrical resistance measurements, micro-Raman spectroscopy and synchrotron x-ray diffraction. Our results show the evidence for an isostructural phase transition from hexagonal 2Hc phase to hexagonal 2Ha phase, which accompanies the metallization at ~37 GPa. This isostructural transition occurs displacively over a large pressure range between 15 and 45 GPa and is driven by the presence of strong shear stress developed in the layer structure of WS2 under non-hydrostatic compression. Interestingly, this transition is absent in hydrostatic conditions using He pressure medium, underscoring its strong dependence on the state of stress. We also attribute the absence to the incorporation of He atoms between the layers, mitigating the development of shear stress. We also conjecture a possibility of magnetic ordering in WS2 that may occur at low temperature near the metallization.

Research Organization:
Carnegie Inst. of Washington, Pullman, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
NA0002006; NA0001974; FG02-99ER45775; 1203834; HDTRA1-12-01-0020
OSTI ID:
1379180
Journal Information:
Journal of Physical Chemistry. C, Vol. 120, Issue 9; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (6)

Pressure-Dependent Strong Photoluminescence of Excitons Bound to Defects in WS 2 Quantum Dots journal June 2018
High-pressure, high-temperature molecular doping of nanodiamond journal May 2019
Hydrostaticity of pressure-transmitting media for high pressure infrared spectroscopy journal September 2019
Pressure-induced metallization in MoSe 2 under different pressure conditions journal January 2019
Characterization of the pressure-induced phase transition of metallization for MoTe 2 under hydrostatic and non-hydrostatic conditions journal June 2019
First-principles study of the thermodynamic and vibrational properties of ReS 2 under pressure journal December 2019

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