Journal of Inorganic Materials ›› 2021, Vol. 36 ›› Issue (3): 313-318.DOI: 10.15541/jim20200184

Special Issue: 【虚拟专辑】热电材料(2020~2021) 【能源环境】热电材料

• RESEARCH LETTERS • Previous Articles     Next Articles

Mechanical Property of SnSe Single Crystal Prepared via Vertical Bridgman Method

JIN Min1(), BAI Xudong1,2, ZHAO Su1, ZHANG Rulin1, CHEN Yuqi1, ZHOU Lina1   

  1. 1. College of Materials, Shanghai Dianji University, Shanghai 201306, China
    2. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2020-04-07 Revised:2020-06-07 Published:2021-03-20 Online:2020-07-21
  • About author:JIN Min(1982-), male, professor. E-mail:
  • Supported by:
    Shanghai Natural Science Foundation(19ZR1419900)


Ⅳ-Ⅵ SnSe single crystal is an attractive thermoelectric (TE) material due to its outstanding TE behavior and environment friendly charactistic. In this work, an effective way for SnSe single crystal growth was explored, and the mechanical property of the as-prepared product was investigated. Undoped SnSe single crystal with accurate stoichiometric ratio was successfully grown via a vertical Bridgman method. The as-grown SnSe single crystal has standard orthorhombic Pnma space group at room temperature. It is easy to cleave along (100) plane because of its weak link between adjacent Sn-Se layers. Microindentation test reveals that SnSe single crystal is a very soft material as its average Vickers microhardness HV is only 53 MPa under 0.01-0.05 kg applied loads. However, it displays excellent fracture toughness due to strong heteropolar bonds between Sn and Se atoms inside (100) plane. The friction coefficient COF on (100) is increased from 0.09 to 0.8 as the scratch load is added from 5 to 300 mN. This work is of great significance to provide the mechanical property of SnSe single crystal.

Key words: SnSe single crystal, vertical Bridgman method, mechanical property

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