Enhanced power factor in CaMnO3-based thermoelectric ceramics via co-doping

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-04-29 DOI:10.1016/j.materresbull.2025.113529

P. Amirkhizi , M.A. Torres , M. Depriester , M. Hedayati , A. Sotelo , M.A. Madre , A.V. Kovalevsky , Sh. Rasekh

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Abstract

Nb-doped Ca_0.97Y_0.01La_0.01Yb_0.01Mn_1-xNb_xO₃ materials were prepared to assess their thermoelectric properties. Samples were obtained by sintering at 1583 K for 12 h involving planetary milled precursors. XRD analysis indicated primarily thermoelectric phase with minor CaMn₂O₄. Microstructural observations revealed decreasing grain size with increasing Nb content. However, electrical resistivity decreases for the samples with Nb-content up to 0.03, which can be associated with the increase of the charge carrier concentration. The lowest value at 1073 K (9.2mΩcm) is among the best reported in the literature. Seebeck coefficient decreased with Nb-doping, and the best PF value at 1073 K has been determined for 0.01Nb samples (∼0.48mW/K²m). Assuming the thermal conductivity at 1073 K similar to that at 473 K, the calculated ZT values are among the typically reported in this family. These results highlight the promise of CaMnO₃-based materials for integration in thermoelectric modules working under steady-state mode, where the high PF values are of great importance.

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通过共掺杂提高camno3基热电陶瓷的功率因数

制备了掺杂nb的Ca0.97Y0.01La0.01Yb0.01Mn1-xNbxO3材料，并对其热电性能进行了评价。样品在1583 K下烧结12 h，采用行星研磨前驱体。XRD分析表明主要为热电相，CaMn2O4含量较少。显微组织观察表明，随着铌含量的增加，晶粒尺寸减小。当铌含量达到0.03时，样品的电阻率下降，这可能与载流子浓度的增加有关。最低值为1073 K （9.2mΩcm）是文献中报道的最好的值之一。塞贝克系数随nb掺杂而降低，对于0.01Nb样品（~ 0.48mW/K2m），在1073 K时确定了最佳PF值。假设1073 K时的导热系数与473 K时相似，计算出的ZT值属于该族中典型的报告。这些结果突出了基于camno3的材料集成在稳态模式下工作的热电模块中的前景，其中高PF值非常重要。

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

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.