Pressure induced lattice expansion and phonon softening in layered ReS2

被引：16

作者：

Saha, Pinku ^{[1
]}

Ghosh, Bishnupada ^{[1
]}

Mazumder, Aritra ^{[1
]}

Glazyrin, Konstantin ^{[2
]}

Mukherjee, Goutam Dev ^{[1
]}

机构：

[1] Indian Inst Sci Educ & Res Kolkata, Natl Ctr High Pressure Studies, Dept Phys Sci, Mohanpur Campus, Nadia 741246, W Bengal, India

[2] DESY, Photon Sci, D-22607 Hamburg, Germany

来源：

JOURNAL OF APPLIED PHYSICS | 2020年 / 128卷 / 08期

关键词：

X-RAY-DIFFRACTION; TRANSITION; RHENIUM;

D O I：

10.1063/5.0014347

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report high pressure x-ray diffraction and systematic Raman measurements on a ReS 2 sample, which is mechanically exfoliated from a single crystal. A few new Bragg peaks are observed to emerge above 6GPa 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 15-25GPa. 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 25GPa with respect to below 15GPa data. The same is also reflected in the Raman mode shifts with pressure.

引用

页数：10

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