High-temperature thermoelectric characterization of filled strontium barium niobates: power factors and carrier concentrations

IF 1.2 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Materials Research Pub Date : 2017-03-01 DOI:10.1557/JMR.2017.18

J. H. Chan, Jonathan A. Bock, Hanzheng Guo, S. Trolier-McKinstry, C. Randall

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引用次数: 9

Abstract

Thermoelectric properties of oxygen-deficient filled strontium barium niobates (SBN, Sr_xBa_6− x Nb_10O_30−δ) in the composition range from the barium end member to a Sr:Ba ratio of 80:20 were investigated. The electrical conductivity, Seebeck coefficients, and power factors for ceramic samples annealed at 1300–1310 °C for 30 h under forming gas (∼10^−16 pO_2 atm) were evaluated from ∼350 to 970 K. The conduction mechanism in the filled SBNs was found to be similar to that of the heavily-reduced unfilled SBNs reported in literature. However, relative to the unfilled counterparts heat-treated at 10^−16 atm pO_2, larger power factors were observed in the filled SBNs. The thermoelectric performance of these filled SBNs was composition-sensitive; lower Sr contents showed higher electrical conductivities, and power factors. Electron diffraction and Hall experiments suggest that both mobility and carrier concentration are enhanced with decreasing Sr. For ceramic samples, the highest power factors achievable were found for low Sr, heavily-reduced filled compositions.

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填充铌酸锶钡的高温热电特性:功率因数和载流子浓度

研究了富氧填充铌酸锶钡(SBN, Sr_xBa_6−x Nb_10O_30−δ)在钡端元至Sr:Ba比为80:20的组成范围内的热电性能。在形成气体(~ 10^−16 pO_2 atm)下，在1300-1310°C下退火30 h的陶瓷样品的电导率、塞贝克系数和功率因数在~ 350至970 K范围内进行了评估。填充的sbn的传导机制与文献报道的重还原的未填充sbn相似。然而，相对于在10^−16 atm pO_2下热处理的未填充的sbn，在填充的sbn中观察到更大的功率因数。这些填充的sbn热电性能是组分敏感的;Sr含量越低，电导率和功率因数越高。电子衍射和霍尔实验表明，迁移率和载流子浓度都随着锶的降低而增强。对于陶瓷样品来说，低锶、重还原填充成分的功率因数最高。

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

International Journal of Materials Research 工程技术-冶金工程

CiteScore

1.30

自引率

12.50%

发文量

119

审稿时长

6.4 months

期刊介绍： The International Journal of Materials Research (IJMR) publishes original high quality experimental and theoretical papers and reviews on basic and applied research in the field of materials science and engineering, with focus on synthesis, processing, constitution, and properties of all classes of materials. Particular emphasis is placed on microstructural design, phase relations, computational thermodynamics, and kinetics at the nano to macro scale. Contributions may also focus on progress in advanced characterization techniques. All articles are subject to thorough, independent peer review.