Low temperature synthesis of calcium cobaltites in a solid state reaction |
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Authors: | Pawe? Smaczyński Ma?gorzata Sopicka-Lizer Karolina Koz?owska Julian Plewa |
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Affiliation: | (1) Department of Materials Science, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, Poland;(2) University of Applied Sciences, Stegerwaldstrasse 39, 48565 Steinfurt, Germany |
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Abstract: | This paper presents synthesis of calcium cobaltites of the nominal composition of Ca3Co4O9 prepared by the solid state reaction. The reaction between CaCO3 and Co3O4 was investigated at 700–900 °C during 20 h and at 800 °C during 2–30 h. Mass changes, phase composition and Co+3, Co+4 content were examined. Stability of the calcined specimens was tested by DTA/TG. It was found that two phases: Ca3Co4O9 and Ca3Co2O6 were present as a result of calcinations above 800 °C. On the other hand, the temperature of 750 °C was too low for calcium
cobaltites to be synthesized. Mono-phase material with Ca3Co4O9 phase was obtained after calcinations at 800 °C but non-stoichiometry of the compound and its relation to the calcinations
time were found. Once synthesized, the compound was stable up to 900 °C. |
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Keywords: | Calcination Powders— solid state reaction Calcium cobaltites DTA/TG |
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