Anomalous structural phase transition properties in ReSe2 and Au-doped ReSe2

Abstract

The high pressure induced phase transition in rhenium diselenides (ReSe(2)) and gold-doped rhenium diselenides (Au-ReSe(2)) at ambient temperature have been investigated using angular-dispersive x-ray diffraction (ADXRD) under high pressure up to around 10.50 and 9.98 GPa, respectively. In situ ADXRD measurements found that the phase transition pressures of ReSe(2) and Au-ReSe(2) began at 9.98 and 8.52 GPa, respectively. Compressibilities analysis shows the relationship of along c-axis > along a-axis > along b-axis. The linear compressibility of the pressure dependence of α, β, and γ of ReSe(2) shows that a phase transition can be related to a counterclockwise rotational trend of the selenium atoms around the chain of Re(4) atoms during the decrease of the c-axis distance by a combination of stresses due to the bending effect of α and stretching effect of β. The cause of the reduction of the phase transition pressure of Au-ReSe(2) is attributed mainly to a structural distortion as evidenced by the observation of a weak clockwise rotational trend of Se atoms around the chain of Re(4) atoms in the pressure range 3.99-4.99 GPa which subsequently reversed to counterclockwise rotation under higher pressure.

Pressure-induced metallization and superconducting phase in ReS 2

“…In the previous work, Hou et al [36] have explored the high-pressure structures of ReS 2 up to 51 GPa using synchrotron x-ray diffraction (XRD), they found an indication of the occurrence of a new high-pressure phase at 11 GPa. Kao et al [37] also found a transition in ReSe 2 at the pressure of 10.5 GPa. However, both of them did not resolve the crystal structure of the high-pressure phases.…”

Pressure dependence of direct optical transitions in ReS2 and ReSe2

“…3 One of the most direct ways to probe interlayer interaction is by performing highpressure measurements which allow to directly modulate the interlayer distance. In this regard, high-pressure XRD measurements revealed that ReX2 exhibits the largest compressibility amongst all TMDCs, 30,31 and highpressure Raman measurements on ReS2 showed a twofold decreased pressure coefficient of the out-of-plane A1g phonon mode with respect to other TMDCs. 3 spite the fundamental properties of this crystal system being relatively well known at ambient pressure, high-pressure optical measurements would provide highly valuable information in order to evaluate the degree of electronic interlayer coupling in ReX2.…”

Highly Anisotropic Sb2Se3 Nanosheets: Gentle Exfoliation from the Bulk Precursors Possessing 1D Crystal Structure

“…[2c] Hall measurement indicated a hole mobility ratio of 1.8 between x ‐ and y ‐direction in few‐layered black phosphors, and infrared spectroscopy study revealed anisotropic in‐plane optical photoconductivity from 2 to 5 µm . Beside black phosphorous, ReSe 2 is another representative anisotropic 2D material, which crystallizes in the low symmetry triclinic system and consists of Re 4 diamond shaped chains in the plane . Consequently, electron transport anisotropy ratio of 3.1 was reported for mechanically exfoliated ReSe 2 nanosheets.…”

“…Angle‐resolved polarized Raman spectroscopy is a powerful tool to diagnose crystal orientation and anisotropic behavior of materials, which has been previously used in anisotropic 2D nanosheets including ReSe 2 [4c] and black phosphorus . Here we thus performed linearly polarized Raman measurements on our 2D Sb 2 Se 3 nanosheets.…”