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Structure and Thermoelectric Properties of Me-Substituted In4Sn3O12, Me=Y and Ti

✍ Scribed by W. Pitschke; J. Werner; G. Behr; K. Koumoto

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 261 KB
Volume: 153
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.2000.8781

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✦ Synopsis

Me-substituted In 4 Sn 3 O 12 , Me ‫؍‬ Y and Ti, have been prepared by high-temperature solid state reaction and subsequent quenching. The structure of these compounds was analyzed using the Rietveld method. Y substitution causes an enlargement of the lattice constant whereas Ti substitution diminishes the size of the unit cell. The thermoelectric transport properties of Me-substituted In 4 Sn 3 O 12؊ were investigated over a temperature range of 300 to 1273 K. The electrical conductivity, , decreases with increasing substitution level, whereas the absolute value of the Seebeck coef5cient, S, increases. Highly Ti-substituted compounds at high temperatures exhibited maximum values of the power factor S 2 for thermoelectric power generation of 1.9 10 ؊4 W K ؊2 m ؊1 during annealing under an argon atmosphere containing less than 10 ppm oxygen. Relatively low thermal conductivities of the sintered pellets of the compounds, ca. 1.3 W m ؊1 K ؊1 at 1273 K, lead to the largest value of the thermoelectric 5gure of merit Z ‫؍‬ S 2 / ‫؍‬ 1.5 10 ؊4 K ؊1 as the maximum value at 1273 K.

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