非谐性
热电材料
材料科学
热导率
陶瓷
氧化物
热电效应
声子
声子散射
功勋
钙钛矿(结构)
纳米技术
凝聚态物理
工程物理
光电子学
热力学
化学
物理
复合材料
冶金
结晶学
作者
Ritwik Banerjee,Sabitabrata Chatterjee,M. Ranjan,Tathagata Bhattacharya,Soham Mukherjee,Subhra Sourav Jana,Akansha Dwivedi,Tanmoy Maiti
标识
DOI:10.1021/acssuschemeng.0c03849
摘要
Although SrTiO3-based perovskites showed a lot of promise as n-type thermoelectric (TE) materials, they demonstrated a low figure of merit value primarily because of their high lattice thermal conductivity (kl). Researchers found it difficult to reduce kl, as a popular route like nanostructuring did not work well with these perovskites possessing low phonon mean free paths. Here, we put forward a novel strategy of designing high-entropy perovskite (HEP) oxides having five transition metals in the B site to induce more anharmonicity causing enhanced multiphonon scattering in order to decrease kl. Using detailed thermodynamic calculations, we designed and synthesized a highly dense Sr(Ti0.2Fe0.2Mo0.2Nb0.2Cr0.2)O3 HEP ceramic. An ultralow thermal conductivity of 0.7 W/mK at 1100 K was achieved in this n-type rare-earth-free HEP oxide TE material. The concept of designing HEPs to achieve ultralow thermal conductivity potentially opens up a new avenue for enhancing TE performance of environmentally benign bulk oxides for high-temperature TE power generation.
科研通智能强力驱动
Strongly Powered by AbleSci AI