Relationship between thermoelectric properties and infrared emissivity of Gd-doped SrO(SrTiO3)2

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-11-26 DOI:10.1016/j.jeurceramsoc.2024.117112

Yaqian Du, Jianbo Li, Jun Wang

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引用次数: 0

Abstract

Compared with perovskite SrTiO₃, SrO(SrTiO₃)₂ exhibits lower thermal conductivity, while maintaining a high Seebeck coefficient, making it a promising material for photothermoelectric conversion. However, the relationship between its infrared and thermoelectric properties remains unexplored. This study examines the effect of Gd doping on these properties of SrO(SrTiO₃)₂. Increased Gd doping induces a gradual transformation of SrO(SrTiO₃)₂-based into a SrTiO₃-based material, resulting in a composite comprising three phases and a notable reduction in thermal conductivity. At 973 K, the thermal conductivity decreases to a minimum of 1.4 W m⁻¹ K⁻¹, which is 23 % lower than undoped SrO(SrTiO₃)₂ and 51 % lower than SrTiO₃. Like SrTiO₃, SrO(SrTiO₃)₂ absorbs infrared radiation in the 8–14 μm range. Although the highest ZT value reaches only 0.06 at 973 K, it shows a positive correlation with infrared emissivity. These findings are valuable for advancing the application of thermoelectric effects and the development of high-performance infrared materials.

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掺钆 SrO（SrTiO3）2 的热电性能与红外发射率之间的关系

与包晶 SrTiO3 相比，SrO(SrTiO3)2 具有较低的热导率，同时保持较高的塞贝克系数，因此是一种很有前途的光热转换材料。然而，它的红外特性与热电特性之间的关系仍有待探索。本研究探讨了掺杂钆对 SrO（SrTiO3）2 这些特性的影响。掺杂钆量的增加会促使以 SrO（SrTiO3）2 为基础的材料逐渐转变为以 SrTiO3 为基础的材料，从而形成由三相组成的复合材料，并显著降低热导率。在 973 K 时，热导率最低降至 1.4 W m-1 K-1，比未掺杂的 SrO（SrTiO3）2 低 23%，比 SrTiO3 低 51%。与 SrTiO3 一样，SrO(SrTiO3)2 也会吸收 8-14 μm 范围内的红外辐射。虽然最高 ZT 值在 973 K 时仅为 0.06，但它与红外线发射率呈正相关。这些发现对于推动热电效应的应用和高性能红外材料的开发具有重要价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.