Synthesis of ceramic materials based on Ca-Co-O system by citric acid method

prezentace, poster

angličtina

Cobaltite ceramics represent an important category of thermoelectric materials. A huge point of interest, especially in high-temperature and energetic applications is dedicated them due to their feasible thermoelectric performance (i.e. maximum power factor, low thermal conductivity and electrical resistivity). The synthesis of Ca3Co4O9 phase and its processing is discussed within this work. As a major way of synthesis, the citric acid wet method was chosen. In order to prepare the single-phase product, the different reaction conditions were applied. The influence of raw materials input, a various molar ratio of EDTA to citric acid, the different stoichiometry of the starting materials or the effect of the firing conditions was observed. The simultaneous differential thermal and thermogravimetric analysis (TG-DTA), X-Ray diffraction analysis and scanning electron microscopy were performed to characterize the synthetized powders. Prepared samples were ball-milled with organic binder additive and un-axially pressed to pellets. The sintering conditions were studied by heating microscopy. Final products were examined by means of phase composition, microstructure and electrical properties.

Cobaltites,Thermoelectric materials,Citric acid method

ŽÁKOVÁ, K.; BARTONÍČKOVÁ, E.; GALVÁNKOVÁ, L.; ŠVEC, J.

14. 6. 2019

Turín

747

747

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