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Influence of Reaction-Sintering and Calcination Conditions on Thermoelectric Properties of Sm-doped Calcium Manganate CaMnO3
S. Bresch1, B. Mieller1, F. Delorme2, C. Chen2, M. Bektas3, R. Moos3, T. Rabe1
1 Advanced Technical Ceramics Division, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 44 – 46, D-12203 Berlin, Germany
2 Université de Tours, CNRS, CEA, INSA CVL, GREMAN UMR 7347, IUT de Blois, 15 rue de la chocolaterie, CS 2903, 41029 Blois Cedex, France
3 Department of Functional Materials, University of Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
received February 28, 2018, received in revised form June 18, 2018, accepted June 27, 2018
Vol. 9, No. 3, Pages 289-300 DOI: 10.4416/JCST2018-00017
Abstract
A wide range of solid-state synthesis routes for calcium manganate is reported in the literature, but there is no systematic study about the influence of the solid-state synthesis conditions on thermoelectric properties. Therefore, this study examined the influence of calcination temperature and calcination cycles on the Seebeck coefficient, electrical conductivity, and thermal conductivity. Higher calcination temperatures and repeated calcination cycles minimized the driving force for sintering of the synthesized powder, leading to smaller shrinkage and lower densities of the sintered specimens. As the electrical conductivity increased monotonously with increasing density, a higher energy input during calcination caused deterioration of electrical conductivity. Phase composition and Seebeck coefficient of sintered calcium manganate were not influenced by the calcination procedure. The highest thermoelectric properties with the highest power factors and figures of merit were obtained by means of reaction-sintering of uncalcined powder.
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Keywords
Thermoelectric oxides, calcination, solid-state-synthesis, power factor, reaction-sintering
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