Thermoelectric efficiency of reduced SrTiO 3 ceramics modified with la and Nb

Takashi Teranishi; Yusuke Ishikawa; Hidetaka Hayashi; Akira Kishimoto; Misaki Katayama; Yasuhiro Inada

doi:10.1111/jace.12379

Thermoelectric efficiency of reduced SrTiO ₃ ceramics modified with la and Nb

Takashi Teranishi, Yusuke Ishikawa, Hidetaka Hayashi, Akira Kishimoto, Misaki Katayama, Yasuhiro Inada

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

Ceramics of La_xSr_1-xNb_yTi _1-yO₃ (LSNT) were synthesized under various reducing atmospheres. Covering the specimens with graphite carbon felt under an Ar-gas flow during sintering drastically enhanced the electrical conductivity, σ. Ti K-edge absorption spectra indicated the presence of Ti³⁺ for heavily reduced specimens. The increase in conductivity was attributed to the 3d band of Ti³⁺. The maximum value for the figure of merit, ZT, was obtained for strontium titanate ceramics modified with both 5 mol% La and 5 mol% Nb, namely 5/5-LSNT, exhibiting a ZT value of ~0.221 at 473 K. This high ZT value was almost 1.5 × larger than that of the conventional 10 mol% La-doped sample, 10/0-LSNT (ZT~0.144), and was mainly attributed to the larger Seebeck coefficient of the material.

Original language	English
Pages (from-to)	2852-2856
Number of pages	5
Journal	Journal of the American Ceramic Society
Volume	96
Issue number	9
DOIs	https://doi.org/10.1111/jace.12379
Publication status	Published - Sept 2013

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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title = "Thermoelectric efficiency of reduced SrTiO 3 ceramics modified with la and Nb",

abstract = "Ceramics of LaxSr1-xNbyTi 1-yO3 (LSNT) were synthesized under various reducing atmospheres. Covering the specimens with graphite carbon felt under an Ar-gas flow during sintering drastically enhanced the electrical conductivity, σ. Ti K-edge absorption spectra indicated the presence of Ti3+ for heavily reduced specimens. The increase in conductivity was attributed to the 3d band of Ti3+. The maximum value for the figure of merit, ZT, was obtained for strontium titanate ceramics modified with both 5 mol% La and 5 mol% Nb, namely 5/5-LSNT, exhibiting a ZT value of ~0.221 at 473 K. This high ZT value was almost 1.5 × larger than that of the conventional 10 mol% La-doped sample, 10/0-LSNT (ZT~0.144), and was mainly attributed to the larger Seebeck coefficient of the material.",

author = "Takashi Teranishi and Yusuke Ishikawa and Hidetaka Hayashi and Akira Kishimoto and Misaki Katayama and Yasuhiro Inada",

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T1 - Thermoelectric efficiency of reduced SrTiO 3 ceramics modified with la and Nb

AU - Teranishi, Takashi

AU - Ishikawa, Yusuke

AU - Hayashi, Hidetaka

AU - Kishimoto, Akira

AU - Katayama, Misaki

AU - Inada, Yasuhiro

PY - 2013/9

Y1 - 2013/9

N2 - Ceramics of LaxSr1-xNbyTi 1-yO3 (LSNT) were synthesized under various reducing atmospheres. Covering the specimens with graphite carbon felt under an Ar-gas flow during sintering drastically enhanced the electrical conductivity, σ. Ti K-edge absorption spectra indicated the presence of Ti3+ for heavily reduced specimens. The increase in conductivity was attributed to the 3d band of Ti3+. The maximum value for the figure of merit, ZT, was obtained for strontium titanate ceramics modified with both 5 mol% La and 5 mol% Nb, namely 5/5-LSNT, exhibiting a ZT value of ~0.221 at 473 K. This high ZT value was almost 1.5 × larger than that of the conventional 10 mol% La-doped sample, 10/0-LSNT (ZT~0.144), and was mainly attributed to the larger Seebeck coefficient of the material.

AB - Ceramics of LaxSr1-xNbyTi 1-yO3 (LSNT) were synthesized under various reducing atmospheres. Covering the specimens with graphite carbon felt under an Ar-gas flow during sintering drastically enhanced the electrical conductivity, σ. Ti K-edge absorption spectra indicated the presence of Ti3+ for heavily reduced specimens. The increase in conductivity was attributed to the 3d band of Ti3+. The maximum value for the figure of merit, ZT, was obtained for strontium titanate ceramics modified with both 5 mol% La and 5 mol% Nb, namely 5/5-LSNT, exhibiting a ZT value of ~0.221 at 473 K. This high ZT value was almost 1.5 × larger than that of the conventional 10 mol% La-doped sample, 10/0-LSNT (ZT~0.144), and was mainly attributed to the larger Seebeck coefficient of the material.

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Thermoelectric efficiency of reduced SrTiO ₃ ceramics modified with la and Nb

Abstract

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