THERMOELECTRIC PROPERTIES OF (Na,M)xCoO2(M= Li, K, Cs)CERAMICS
Научная публикация
THERMOELECTRIC PROPERTIES OF (Na,M)xCoO2(M= Li, K, Cs)CERAMICS
Автор(ы): N. S. Krasutskaya, Ye. A. Chizhova, T. S. Busel', A. I. Klyndyuk
УДК: 54-31+536.413+537.31/.32+666.654
Год издания: 2013
Дата загрузки: 05.02.2015
Загрузил(а): Рогова О. А.

Описание:
The (Na,M)xCoO2(M= Li, K, Cs; x= 0.55; 0.89) ceramics was synthesized, and its phase composition, thermal expansion, electrical conductivity and thermo-EMF were investigated. The materials obtained were polyphase ones and theyconsisted of sodium cobaltite (-NaxCoO2), Co3O4and of other alkaline metals cobaltites (LiCoO2, KCoO2, Cs2CoO3). The temperature dependences of electrical conductivity of the (Na,M)0.55CoO2(M= K, Cs) and (Na,M)0.89CoO2samples had semiconducting character, but (Na,Li)0.55CoO2ones had metallic character. The materials studied were p-type conductors, which thermo-EMF and power factor (P) values rose at temperature increasing, and values of linear thermal expansion coefficient varied within (11.1–14.9) · 10 –6 K –1 . Inserting into Na0.55CoO2ceramics the lithium or potassium oxides increased its power factor; thus, for Na0.28K0.27CoO2compound P1100= 361 W m –1 K –2 , which was 85% higher than for Na0.55CoO2.

Использование электронных материалов, размещенных на данном сайте, осуществляется на договорной основе. Разрешается использовать ресурсы в единичном экземпляре и исключительно в личных целях.



ChemistryTechnology of Inorganic Substances