无机材料学报 ›› 2023, Vol. 38 ›› Issue (3): 270-279.DOI: 10.15541/jim20220356 CSTR: 32189.14.10.15541/jim20220356

所属专题: 【能源环境】热电材料(202409) 【信息功能】大尺寸功能晶体(202409)

• 综述 • 上一篇    下一篇

Zintl相Mg3X2(X=Sb, Bi)基晶体生长及热电性能研究进展

林思琪1,2,3(), 李艾燃4, 付晨光4, 李荣斌1, 金敏1,3()   

  1. 1.上海电机学院 材料学院, 上海 201306
    2.同济大学 材料科学与工程学院, 上海201804
    3.山东大学 晶体材料国家重点实验室, 济南 250100
    4.浙江大学 材料科学与工程学院, 杭州 310027
  • 收稿日期:2022-06-24 修回日期:2022-08-09 出版日期:2023-03-20 网络出版日期:2022-10-28
  • 通讯作者: 金 敏, 教授. E-mail: jmaish@aliyun.com
  • 作者简介:林思琪(1992-), 女, 博士, 副教授. E-mail: linsiqi0811@163.com
  • 基金资助:
    国家自然科学基金(52001231);国家自然科学基金(52272006);上海市教委曙光计划

Crystal Growth and Thermoelectric Properties of Zintl Phase Mg3X2 (X=Sb, Bi) Based Materials: a Review

LIN Siqi1,2,3(), LI Airan4, FU Chenguang4, LI Rongbing1, JIN Min1,3()   

  1. 1. College of Materials, Shanghai Dianji University, Shanghai 201306, China
    2. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
    3. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
    4. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2022-06-24 Revised:2022-08-09 Published:2023-03-20 Online:2022-10-28
  • Contact: JIN Min, professor. E-mail: jmaish@aliyun.com
  • About author:LIN Siqi (1992-), female, PhD, associate professor. E-mail: linsiqi0811@163.com
  • Supported by:
    National Natural Science Foundation of China(52001231);National Natural Science Foundation of China(52272006);Shuguang Program of Shanghai Education Development Foundation and Shanghai Municipal Education Commission

摘要:

Zintl相Mg3X2(X= Sb, Bi)基热电材料以其无毒性、价格低及性能高等优点而备受关注。与多晶相比, Mg3X2晶体在揭示材料本征热电性能、各向异性性质及电声输运调控策略等方面极具研究价值。本文系统归纳与总结近年Mg3X2基晶体的生长及热电性能发展现状。针对Mg3X2晶体生长过程中Mg元素易挥发和活泼金属性的难点, 多种技术如合适的温度冷却法、定向凝固法、助熔剂法、助熔剂坩埚下降法等被开发运用于生长Mg3X2晶体, 其中助熔剂坩埚下降法在获得大尺寸块状晶体方面更有竞争力。n型和p型Mg3Sb2晶体都呈现出各向异性的热电性能。调控晶体生长速度、Mg元素自补偿含量、杂质元素掺杂与固溶含量等手段, 都会影响Mg3X2晶体的电学性能和热学性能。目前p型和n型Mg3Sb2基晶体的最高ZT值可分别达到0.68和0.82。本文综述了Zintl相Mg3X2基晶体生长与热电性能的研究进展, 发现助熔剂坩埚下降法是制备大尺寸Mg3X2基晶体的关键, 通过元素掺杂及固溶方法调控载流子浓度和能带结构可以进一步提高Mg3X2基晶体性能。该生长方法和研究思路对将来Mg3X2基晶体制备与热电性能深入研究具有重要指导意义。

关键词: Zintl相, Mg3X2, 晶体生长, 热电性能, 综述

Abstract:

Zintl phase Mg3X2 (X=Sb, Bi) based thermoelectric materials have attracted much attention because of their non-toxic, low cost and high performance. Compared with polycrystalline materials, the Mg3X2 crystals are of great value in revealing material’s intrinsic and anisotropic thermoelectric properties, as well as providing effective strategies for enhancing electrical and thermal transport properties. Therefore, the recent progress of single crystal growth and thermoelectric properties for Mg3X2 crystals are systematically summarizes in this paper. Due to the volatility and causticity of Mg element, several different methods such as slow cooling method, directional solidification method, flux method, and flux Bridgman method are widely used for synthesizing Mg3X2 crystals, in which the flux Bridgman method is more competitive to prepare large size bulk crystals. Researchers found that both n-type and p-type Mg3Sb2 crystals show an anisotropy thermoelectric transport property. The crystal growth rate, the concentration of self-doped Mg element, the concentration of impurity doping or alloying elements have a great impact on both electrical and thermal transport properties for Mg3Sb2 crystals. So far, the p-type and n-type Mg3Sb2 crystals with ZT value of 0.68 and 0.82 are achieved, respectively. This paper reviews the recent progress of growth and thermoelectrics properties of Zintl phase Mg3X2-based crystals, revealing that the flux Bridgman method is the most effective method to produce large-sized Mg3X2-based crystals. Tuning chemical composition of Mg3X2-based crystal by doping and forming solid solution for optimal carrier concentration and band structure engineering is expected to further improve the thermoelectric performance of Mg3X2-based crystal. The above-mentioned growth method and research strategies provide a significant guidance for the in-depth understanding of the Mg3X2-based crystal in the future.

Key words: Zintl phase, Mg3X2, crystal growth, thermoelectric property, review

中图分类号: