
人工晶体学报 ›› 2026, Vol. 55 ›› Issue (8): 1290-1296.DOI: 10.16553/j.cnki.issn1000-985x.2026.0056
尹伟1,2(
), 张亚龙1, 杨顺铠1, 钱鸿福1, 马小强3, 马小红3, 李萍1,2(
)
收稿日期:2026-04-03
出版日期:2026-08-20
发布日期:2026-08-26
通信作者:
李萍,副教授。E-mail:1659681147@qq.com作者简介:尹伟(1990—),男,四川省人,副教授。E-mail:2016066@xjit.edu.cn
基金资助:
YIN Wei1,2(
), ZHANG Yalong1, YANG Shunkai1, QIAN Hongfu1, MA Xiaoqiang3, MA Xiaohong3, LI Ping1,2(
)
Received:2026-04-03
Online:2026-08-20
Published:2026-08-26
摘要: 本文采用半经典玻尔兹曼输运理论和第一性原理对两种反钙钛矿化合物Sr3XO(X=Sb,Bi)的热输运性质进行了深入研究。弹性常数和声子谱结果表明,Sr3SbO和Sr3BiO具有力学和动力学稳定性,其熔融温度分别为1 062.4和1 030.5 K。两种化合物能够在室温和高温条件下保持较低的晶格热导率(κL),300 K时,Sr3SbO和Sr3BiO的κL分别为1.472和3.122 W·m-1·K-1,尤其Sr3SbO的κL比经典热电材料PbTe(2.3 W·m-1·K-1)更低;700 K时,Sr3SbO和Sr3BiO的κL分别为0.671和1.343 W·m-1·K-1。相比Sr3BiO,Sr3SbO具有更强的非谐性。同时,本文还对两种化合物的热容、声子群速度和声子寿命进行了对比研究。本研究揭示了导致两种化合物低晶格热导率的微观机制,为后续设计具有低热导率的新型功能材料提供了理论依据。
中图分类号:
尹伟, 张亚龙, 杨顺铠, 钱鸿福, 马小强, 马小红, 李萍. 第一性原理研究反钙钛矿Sr3XO(X=Sb, Bi)化合物的声子热输运性质[J]. 人工晶体学报, 2026, 55(8): 1290-1296.
YIN Wei, ZHANG Yalong, YANG Shunkai, QIAN Hongfu, MA Xiaoqiang, MA Xiaohong, LI Ping. First-Principles Study on Phonon Thermal Transport Properties of Anti-Perovskite Sr3XO (X = Sb, Bi) Compounds[J]. Journal of Synthetic Crystals, 2026, 55(8): 1290-1296.
| System | C11/GPa | C12/GPa | C44/GPa | Tm/K |
|---|---|---|---|---|
Sr3SbO Sr3BiO | 86.2 80.8 | 31.1 27.2 | 28.1 27.4 | 1 062.4±300 1 030.5±300 |
表1 Sr3XO (X = Sb, Bi)的弹性常数(Cij )和熔融温度(Tm)
Table 1 Elastic constants (Cij ) and melting temperature (Tm) of Sr3XO (X = Sb, Bi)
| System | C11/GPa | C12/GPa | C44/GPa | Tm/K |
|---|---|---|---|---|
Sr3SbO Sr3BiO | 86.2 80.8 | 31.1 27.2 | 28.1 27.4 | 1 062.4±300 1 030.5±300 |
图3 κL作为温度的函数(a),累积κL作为声子平均自由程(MFP)(b)和声子频率的函数(c)
Fig.3 κL as a function of temperature (a), cumulative κL as a function of phonon mean free path (MFP) (b) and phonon frequency (c)
图4 (a)Sr3XO(X=Sb, Bi)化合物中Sb和Bi原子的原子位移参数随温度的变化;(b)Sr3XO(X=Sb, Bi)化合物中Sb和Bi原子的势能与位移的函数关系
Fig.4 (a) Temperature dependence of atomic displacement parameters of Sb and Bi atoms in Sr3XO (X=Sb, Bi) compounds; (b) potential energy as a function of displacement for Sb and Bi atoms in Sr3XO (X=Sb, Bi) compounds
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