Thermoelectric Efficiency of Reduced SrTiO3 Ceramics Modified with La and Nb. Issue 9 (11th May 2013)

• Record Type: Journal Article
• Authors: Teranishi, Takashi; Ishikawa, Yusuke; Hayashi, Hidetaka; Kishimoto, Akira; Katayama, Misaki; Inada, Yasuhiro; Zhou, X.‐D.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 9(2013)
• Page Start: 2852
• Page End: 2856
• Publication Date: 2013-05-11
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12379
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12379-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Ceramics of La_{<italic>x</italic>}Sr_{1−<italic>x</italic>}Nb_{<italic>y</italic>}Ti_{1−<italic>y</italic>}O₃ (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 <italic>3d</italic> band of Ti³⁺. The maximum value for the figure of merit, <italic>ZT</italic>, was obtained for strontium titanate ceramics modified with both 5 mol% La and 5 mol% Nb, namely 5/5‐LSNT, exhibiting a <italic>ZT</italic> value of ~0.221 at 473 K. This high <italic>ZT</italic> value was almost 1.5 × larger than that of the conventional 10 mol% La‐doped sample, 10/0‐LSNT (<italic>ZT</italic>~0.144), and was mainly attributed to the larger Seebeck coefficient of the material.</p> </abstract>