溶胶-凝胶自燃烧技术合成la掺杂a位SrTiO3陶瓷的热电性能

Q2 Engineering

Materials Research Innovations Pub Date : 2023-04-03 DOI:10.1080/14328917.2023.2196479

P. Nunocha, T. Bongkarn, A. Harnwunggmoung, S. Tanusilp, T. Suriwong

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引用次数: 1

摘要

采用溶胶-凝胶自燃烧法制备了Sr(1 - x)La x TiO3 (SLTO)纳米粉体(x = 0、0.01、0.05、0.07和0.10)。采用火花等离子烧结(SPS)法制备了大块陶瓷样品。未掺杂SLTO纳米粉体的XRD谱图显示为纯相，la掺杂SLTO样品中检测到杂质相(TiO2)。而SPS法制备样品后，杂质相消失。所有样品的塞贝克系数(S)均为负，电导率(σ)和负电导率(S)均随温度升高而增大，在800 K时达到最大值。导热系数(κ)随温度升高和La含量的增加而降低。x = 0.01的SLTO在800k时σ、负S、功率因数(s2 σ)和无因次优值(ZT)最大。

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Thermoelectric properties of La-doped A-site SrTiO3 ceramics synthesised by the sol-gel auto-combustion technique

ABSTRACT Sr(1– x )La x TiO3 (SLTO) nanopowder (x = 0, 0.01, 0.05, 0.07, and 0.10) were effectively synthesised by the sol-gel auto-combustion process. Bulk ceramics samples were produced by spark plasma sintering (SPS) in an Ar atmosphere. The XRD pattern of the undoped SLTO nanopowder showed the pure phase and the impurity phase (TiO2) was detected in the La-doped SLTO samples. However, the impurity phase disappeared after producing the bulk samples with the SPS process. All the samples exhibited a negative Seebeck coefficient (S). The electrical conductivity (σ) and negative Sof all the SLTO samples increased with increasing temperature and reached a maximum value at 800 K. The thermal conductivity (κ) decreased with increasing temperature and increasing La content. The SLTO with x = 0.01 showed the largest σ, negative S, power factor (S 2 σ) and dimensionless figure of merit (ZT) at 800 K.

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来源期刊

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

CiteScore

5.20

自引率

0.00%

发文量

审稿时长

2.8 months

期刊介绍： Materials Research Innovations covers all areas of materials research with a particular interest in synthesis, processing, and properties from the nanoscale to the microscale to the bulk. Coverage includes all classes of material – ceramics, metals, and polymers; semiconductors and other functional materials; organic and inorganic materials – alone or in combination as composites. Innovation in composition and processing to impart special properties to bulk materials and coatings, and for innovative applications in technology, represents a strong focus. The journal attempts to balance enduring themes of science and engineering with the innovation provided by such areas of research activity.