期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 46, 页码 17022-17032出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c03849
关键词
high entropy; perovskites; oxides; thermoelectric; low thermal conductivity
资金
- Science and Engineering Research Board, DST (SERB-DST), India [IMP/20 l8/000955]
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 (k(1)). Researchers found it difficult to reduce k(1), 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 Iq. Using detailed thermodynamic calculations, we designed and synthesized a highly dense Sr(Ti0.2Fe0.2Mo0.2Nb0.2Cr0.2)O-3 HEP ceramic. An ultralow 2 thermal conductivity of 0.7 W/mK at 1100 K was achieved in this n-type rare-earth-free REP 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.
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