Journals Information
Universal Journal of Materials Science Vol. 7(4), pp. 43 - 53
DOI: 10.13189/ujms.2019.070401
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Thermoelectric Properties of Inhomogeneous Ceramics Based on the Layered Calcium Cobaltate
Andrei Klyndyuk 1,*, Ekaterina Chizhova 1, Irina Matsukevich 2, Ekaterina Tugova 3
1 Department of Physical, Colloid and Analytical Chemistry, Belarusian State Technological University, Belarus Republic
2 Laboratory of Magnesium Compounds, The Institute of General and Inorganic Chemistry of National Academy of Sciences of Belarus, Belarus Republic
3 Laboratory of New Inorganic Materials, Ioffe Physical-Technical Institute of Russian Academy of Sciences, Russian Federation
ABSTRACT
The effect of cationic composition and sintering conditions on the electrotransport and thermoelectric properties of Ca3CoxO
(x = 3.8, 4.0, and 4.2) had been investigated. It had been found that increase of cobalt oxide content in the samples increase their electrical conductivity, creation of phase inhomogeneity improves their thermo-EMF coefficient, and sintering above temperature of peritectoid decomposition increase their apparent density, which, in the whole, improves thermoelectric properties of ceramics based on the layered calcium cobaltate Ca3Co4O. So, power factor values of phase inhomogeneous ceramics Ca3Co4.2O, sintered in air below and above temperature of peritectoid decomposition of Ca3Co4O, at 800℃ were equal 255 and 273 
respectively, which was 2.1 and 2.4 times larger than for the Ca3Co4O. It had been also found that sintering of phase inhomogeneous ceramics both in oxidizing or reducing atmospheres resulted in improving of its functional properties. So, power factor values of Ca3Co3.8O (sintered in oxygen at 970℃) and Ca3Co4.2O (sintered in nitrogen at 920℃) at 800℃ were equal 422 and 378 respectively, which was 3.5 and 3.1 times larger than for the Ca3Co4O.
KEYWORDS
Layered Calcium Cobaltate, Phase Inhomogeneity, Thermoelectrics, Sintering Conditions, Electrical Conductivity, Thermo-EMF, Power Factor
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Andrei Klyndyuk , Ekaterina Chizhova , Irina Matsukevich , Ekaterina Tugova , "Thermoelectric Properties of Inhomogeneous Ceramics Based on the Layered Calcium Cobaltate," Universal Journal of Materials Science, Vol. 7, No. 4, pp. 43 - 53, 2019. DOI: 10.13189/ujms.2019.070401.
(b). APA Format:
Andrei Klyndyuk , Ekaterina Chizhova , Irina Matsukevich , Ekaterina Tugova (2019). Thermoelectric Properties of Inhomogeneous Ceramics Based on the Layered Calcium Cobaltate. Universal Journal of Materials Science, 7(4), 43 - 53. DOI: 10.13189/ujms.2019.070401.