Maldistribution of Chemical Bond Strength Inducing Exceptional Anisotropy of Thermal Conductivity in Non-Layered Materials

Yang Hua; Wei Bai; Shengnan Dai; Rongjie He; Pengfei Nan; Liang Sun; Jiong Yang; Bo Sun; Binghui Ge; Chong Xiao; Yi Xie

doi:10.1002/anie.202303081

Maldistribution of Chemical Bond Strength Inducing Exceptional Anisotropy of Thermal Conductivity in Non-Layered Materials

Angew Chem Int Ed Engl. 2023 Jul 3;62(27):e202303081. doi: 10.1002/anie.202303081. Epub 2023 May 19.

Authors

Yang Hua¹, Wei Bai^{1

2}, Shengnan Dai³, Rongjie He⁴, Pengfei Nan⁵, Liang Sun¹, Jiong Yang³, Bo Sun^{4

6}, Binghui Ge⁵, Chong Xiao^{1

2

7}, Yi Xie^{1

2}

Affiliations

¹ Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 230026, Hefei, Anhui, P. R. China.
² Institute of Energy, Hefei Comprehensive National Science Center, 230031, Hefei, Anhui, P. R. China.
³ Materials Genome Institute, Shanghai University, 200444, Shanghai, P. R. China.
⁴ Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, 518055, Shenzhen, Guangdong, P. R. China.
⁵ Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University, 230601, Hefei, Anhui, P. R. China.
⁶ Institute of Material Research, Tsinghua Shenzhen International Graduate School, Guangdong Provincial Key Laboratory of Thermal Management Engineering and Materials, Tsinghua University, 518055, Shenzhen, Guangdong, P. R. China.
⁷ Dalian National Laboratory for Clean Energy, Chinese Academy of Science, 116023, Dalian, Liaoning, P. R. China.

PMID: 37140479
DOI: 10.1002/anie.202303081

Abstract

Currently, the efforts to find materials with high κ anisotropy ratios mainly focus on layered materials, however, the limited quantity and lower workability comparing to non-layered ones boost the exploration of non-layered materials with high κ anisotropy ratios. Here, taking PbSnS₃ , a typical non-layered orthorhombic compound, as an example, we propose that maldistribution of chemical bond strength can lead to large anisotropy of κ in non-layered materials. Our result reveals that the maldistribution of Pb-S bonds lead to obvious collective vibrations of dioctahedron chain units, resulting in an anisotropy ratio up to 7.1 at 200 K and 5.5 at 300 K, respectively, which is one of the highest ever reported in non-layered materials and even surpasses many classical layered materials such as Bi₂ Te₃ and SnSe. Our findings can not only broaden the horizon for exploring high anisotropic κ materials but also provide new opportunities for the application of thermal management.

Keywords: Anisotropy; Non-Layered Materials; Thermal Conductivity.

Abstract

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