Assessing structure of Mg3Bi2−Sb (0 ≤ x ≤ 2) at pressures below 40 GPa

Weiwei,Dong1,2; Wei,Xu1,3; Zhiying,Guo1; Weishu,Liu4; Yu,Pan5; Satishkumar,Kulkarni6; Xiaodong,Li1; Konstantin,Glazyrin2

2023-11

10.1016/j.jmat.2023.10.004

Journal of Materiomics   影响因子和分区

2352-8478

2352-8486

MgBiSb (0 ≤ x ≤ 2) have gained significant attention due to their potential in thermoelectric (TE) applications. However, there has been much debating regarding their structural properties and phase diagram as a function of pressure, which is crucial for understanding of their TE properties. Here, we investigate a unified phase diagram of Mg(Bi,Sb) materials up to 40 GPa at room temperature using high-pressure X-ray diffraction. Two high-pressure phases with the structural transition succession of P3¯m1 → C2/m → P2/n are observed, which is valid for all MgBiSb (0 ≤ x ≤ 2) compounds. We further explore the low-pressure phase P3¯m1 and report that alloying does not change the quasi-isotropic compression of the unit lattice parameters nor has effect on the anisotropic bond compressibility, as recently reported for the end-members. Our study presents a comprehensive picture of MgBiSb as a function of pressure and chemical composition providing a solid foundation for the future experimental and theoretical studies searching for the most efficient TE compound in Mg(Bi,Sb).

High-pressure Mg3Bi2–xSbx (0 ≤ x ≤ 2) Structural evolution Thermoelectric

SCI

英语

其他

Elsevier BV

2-s2.0-85180492318

人工提交

1.Beijing Synchrotron Radiation Facility (BSRF), Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
2.Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
3.International Centre for Material Science Superstripes, RICMASS, Via dei Sabelli 119A, 00185, Rome, Italy
4.Department of Materials Science and Engineering, Southern University of Science and Technology, 518055, Shenzhen, China
5.Max-Planck-Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany
6.Centre for X-ray and Nanoscience CXNS, Deutsches Elektronen Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany

Weiwei,Dong,Wei,Xu,Zhiying,Guo,et al. Assessing structure of Mg3Bi2−Sb (0 ≤ x ≤ 2) at pressures below 40 GPa[J]. Journal of Materiomics,2023,10(4):837-844.

Weiwei,Dong.,Wei,Xu.,Zhiying,Guo.,Weishu,Liu.,Yu,Pan.,...&Konstantin,Glazyrin.(2023).Assessing structure of Mg3Bi2−Sb (0 ≤ x ≤ 2) at pressures below 40 GPa.Journal of Materiomics,10(4),837-844.

Weiwei,Dong,et al."Assessing structure of Mg3Bi2−Sb (0 ≤ x ≤ 2) at pressures below 40 GPa".Journal of Materiomics 10.4(2023):837-844.