We report high pressure x-ray diffraction and systematic Raman measurements on a sample, which is mechanically exfoliated from a single crystal. A few new Bragg peaks are observed to emerge above 6 GPa indicating a structural transition from distorted 1T to distorted 1T in a triclinic structure. The same is corroborated by the appearance of new Raman modes in the same pressure range. Softening of the Raman modes corresponding to Re atom vibrations is observed in the distorted 1T phase in the pressure range of 15–25 GPa. In the same pressure range, the anomalous change in the volume is found to be induced by the lattice expansion. The volume expansion is related to the sliding of layers leading to octahedral distortion and an increase in octahedral volume. The sample is found to be very incompressible above 25 GPa with respect to below 15 GPa data. The same is also reflected in the Raman mode shifts with pressure.
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28 August 2020
Research Article|
August 31 2020
Pressure induced lattice expansion and phonon softening in layered ReS2
Special Collection:
Beyond Graphene: Low Symmetry and Anisotropic 2D Materials
Pinku Saha
;
Pinku Saha
1
National Centre for High Pressure Studies, Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur, 741246 Nadia, West Bengal, India
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Bishnupada Ghosh;
Bishnupada Ghosh
1
National Centre for High Pressure Studies, Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur, 741246 Nadia, West Bengal, India
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Aritra Mazumder;
Aritra Mazumder
1
National Centre for High Pressure Studies, Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur, 741246 Nadia, West Bengal, India
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Konstantin Glazyrin;
Konstantin Glazyrin
2
Photon Science, Deutsches Elektronen Synchrotron
, 22607 Hamburg, Germany
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Goutam Dev Mukherjee
Goutam Dev Mukherjee
a)
1
National Centre for High Pressure Studies, Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata
, Mohanpur Campus, Mohanpur, 741246 Nadia, West Bengal, India
a)Author to whom correspondence should be addressed: goutamdev@iiserkol.ac.in
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a)Author to whom correspondence should be addressed: goutamdev@iiserkol.ac.in
Note: This paper is part of the Special Topic on Beyond Graphene: Low Symmetry and Anisotropic 2D Materials.
J. Appl. Phys. 128, 085904 (2020)
Article history
Received:
May 19 2020
Accepted:
August 15 2020
Citation
Pinku Saha, Bishnupada Ghosh, Aritra Mazumder, Konstantin Glazyrin, Goutam Dev Mukherjee; Pressure induced lattice expansion and phonon softening in layered ReS2. J. Appl. Phys. 28 August 2020; 128 (8): 085904. https://doi.org/10.1063/5.0014347
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