INFLUENCE OF THE PREPARATION METHOD ON THE MICROSTRUCTURE AND PHYSICOCHEMICAL PROPERTIES OF THE (Ca,Bi)3Co4O9+δ COBALTITES
Научная публикация
INFLUENCE OF THE PREPARATION METHOD ON THE MICROSTRUCTURE   AND PHYSICOCHEMICAL PROPERTIES OF THE (Ca,Bi)3Co4O9+δ COBALTITES
Автор(ы): I. V. Matsukevich, A. I. Klyndyuk
УДК: UDC 536.413:537.31/.32:54–31:54.052:666.654
Год издания: 2012
Дата загрузки: 14.05.2014
Загрузил(а): Цылина И. А.

Описание:
The ceramic samples of the (Ca,Bi)3Co4O9+δ were prepared using solid-state reactions and citrate methods. The influence of the preparation method on the crystal and microstructural, physicochemical and functional characteristics of these materials was studied. The temperature-time processing regimes of the (Ca,Вi)3Co4O9+δ ceramics were selected. It is found that Ca2.8Bi0.2Co4O9+δ solid solution, which was prepared by a citrate method, demonstrated the maximal value of the power factor (240 μW/(m · K2) at 1,100 K) among the ceramics prepared. It is shown that citrate method has significant advantages in comparison with the solid-state reactions one because it allows to reduce energy consumption during the synthesis and at the same time to prepare more dense, fine-grained, and electrically conducting ce- ramics with a lower linear thermal expansion coefficient and higher power factor.

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Chemistry and Technology of Inorganic Materials and Substances