激光浮区制备供体取代钛酸锶基复合材料的高热电性能

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-04-03 DOI:10.1016/j.jallcom.2025.180106

Diogo Lopes , Miguel A. Vieira , Nuno M. Ferreira , Vladimir V. Shvartsman , Oscar J. Dura , Francisco Q. Batista , Andrei N. Salak , Sergey Mikhalev , Florinda Costa , Andrei V. Kovalevsky

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引用次数: 0

摘要

氧化物热电材料由丰富的环保材料制成，可以承受高温梯度，这使得它们在高温废热收集方面非常有前途。最近热电材料家族效率的进步是由复合方法驱动的，促进了材料之间的协同效应，并通过先进的加工技术进一步增强。因此，本研究探索了氧化物基热电复合材料的设计，包括在激光浮动区（LFZ）加工的驱动下，在复合相之间重新分配共同取代阳离子。以Sr0.97Ti0.8Nb0.2O3 / 0.15Ti0.95Nb0.05O2为标称成分的铌取代钛酸锶/金红石复合材料，在不同的拉拔速率（50、100和200 mm/h）下经LFZ加工，然后在高还原条件下进行热处理。与传统的固态路线相比，所获得的样品显示出钙钛矿和金红石相之间不均匀的铌分布，这是由LFZ加工固有的强烈非平衡条件形成的。调整拉出速率可以在一定程度上控制两相的铌掺入。在塞贝克系数增强的驱动下，lfz处理和热处理后的样品表现出较高的功率因数，在473 ~ 1173 K下分别达到1350 ~ 820 μW·K-2·m-1。在1173 K下，以100 mm/h的速度加工并进行热处理的复合材料样品的ZT达到了0.52。这种性能归功于高功率因数和低导热系数（在1173 K时约为2 W·m-1·K-1），这是由相和成分的不均匀性以及LFZ工艺引入的残余孔隙度所实现的。LFZ技术提供了相当大的优化潜力，并已被证明是设计陶瓷复合热电材料的有力工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

High thermoelectric performance in donor-substituted strontium titanate-based composites processed by laser floating zone

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High thermoelectric performance in donor-substituted strontium titanate-based composites processed by laser floating zone

Oxide thermoelectrics, made from abundant, eco-friendly materials, can withstand high-temperature gradients, making them highly promising for high-temperature waste heat harvesting. Recent advancements in the efficiency of thermoelectric material families have been driven by composite approaches, fostering synergistic effects between materials, further enhanced by advanced processing techniques. Accordingly, this study explores the design of oxide-based thermoelectric composites, involving the redistribution of a common substituting cation between composite phases, driven by laser floating zone (LFZ) processing. Niobium substituted strontium titanate/rutile composite material with a nominal composition Sr_0.97Ti_0.8Nb_0.2O₃ / 0.15Ti_0.95Nb_0.05O₂ was processed by LFZ at various pulling rates (50, 100, and 200 mm/h), followed by post-thermal treatment under highly reducing conditions. The obtained samples showed inhomogeneous niobium distribution between perovskite and rutile phases shaped by strongly non-equilibrium conditions inherent to the LFZ processing, in contrast to the conventional solid-state route. Adjusting the pulling rate enabled a certain degree of control over niobium incorporation into both phases. Primarily driven by an enhanced Seebeck coefficient, the LFZ-processed and thermally treated samples demonstrated high power factors, reaching 1350–820 μW·K⁻²·m⁻¹ at 473–1173 K, respectively. An appealing ZT of 0.52 at 1173 K was achieved for the composite sample processed at 100 mm/h and subjected to thermal treatment. This performance is attributed to a combination of a high power factor and low thermal conductivity (∼2 W·m⁻¹·K⁻¹ at 1173 K), enabled by phase and compositional inhomogeneities, as well as residual porosity introduced by LFZ processing. The LFZ technique offers considerable potential for optimisation and has proven to be a powerful tool for designing ceramic composite thermoelectric materials.

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.