Temperature Dependent Structural Evolution of WSe2: A Synchrotron X-ray Diffraction Study

被引:24
作者
Mathew, Sinu [1 ,2 ]
Abraham, Aben Regi [2 ]
Chintalapati, Sandhya [3 ]
Sarkar, Soumya [1 ]
Joseph, Boby [4 ]
Venkatesan, Thirumalai [1 ,5 ]
机构
[1] Natl Univ Singapore, NUSNNI NanoCore, Singapore 117411, Singapore
[2] Mahatma Gandhi Univ, SB Coll, Dept Phys, Kottayam 686101, Kerala, India
[3] Tata Inst Fundamental Res, Ctr Interdisciplinary Sci, Hyderabad 500107, India
[4] Elettra Sincrotrone, Str Statale 14 Km 1635 Area Sci Pk, I-34149 Trieste, Italy
[5] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore
来源
CONDENSED MATTER | 2020年 / 5卷 / 04期
关键词
two-dimensional systems; transition metal dichalcogenides; WSe2; X-ray powder diffraction; Debye temperature; TRANSITION-METAL DICHALCOGENIDES; THERMAL-EXPANSION; 2H-MOS2; SPECTRA; 2H-WSE2; MOSE2;
D O I
10.3390/condmat5040076
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
A thorough investigation of the structural parameters of micromechanically exfoliated multilayer WSe2 flakes was undertaken between 400 K to 110 K. Crystal structure of WSe2 remains in the trigonal prismatic structure in this temperature range, however, with a clear difference in the temperature dependence of the in-plane a, and the out-of-plane c, lattice parameters. The linear coefficients of thermal expansion of a and c are 5.132 x 10(-6)/K and 8.105 x 10(-6)/K, respectively. The temperature dependence of the unit-cell volume is analyzed using zero-pressure equation-of-state which yielded the Debye temperature of the WSe2 to be 160 K. Following the temperature dependence of the W-Se and W-W bond distances, a nonlinear behavior is observed in the former in contrast to a rather regular behavior of the later. This significant difference in the temperature dependence of the a and c lattice parameters can have consequences in the macroscopic physical properties of the system. A good correlation between the temperature dependence of the W-Se bond distance and Raman E2g1 mode has been observed.
引用
收藏
页码:1 / 9
页数:9
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