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Thermoelectric Properties of Ca_3Co_4O_9-Based Ceramics Doped with Fe and/or Y

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Fedotov A., Fedotov A., Mazanik A., Svito I., Saad A., Troyanchuk I., Bushinski M., Fedotova V., Zukowski P., Koltunowicz T.

Acta Physica Polonica A

2014

vol. 125

issue 6

1344-1347

We describe here structure and temperature dependences of conductivity σ(T), the Seebeck coefficient α(T), thermal conductivity λ(T) and figure-of-merit ZT(T) in Ca_3Co_4O_9 ceramics, doped with Fe and Y, depending on compacting pressure (0.2 or 6 MPa) and temperature (300 < T < 700 K). It is shown that introduction of iron and yttrium to ceramics does not alter the crystalline structure of the material. Increasing the pressure in the compacting process before the additional diffusion annealing leads to a smaller-grained structure and increase σ and λ due to reducing of the synthesized samples porosity. The Seebeck coefficients of nanocomposite ceramics Ca_3Co_{3.9}Fe_{0.1}O_9 and (Ca_{2.9}Y_{0.1})(Co_{3.9}Fe_{0.1})O_9 have linear dependences on temperature is not changed after increase of compacting pressure. Electrical-to-heat conductivity ratio (σ/λ) for the samples compacted at high (6 GPa) pressure increases not more than 20-30% in comparison with ones compacted at low (0.2 GPa) pressure, whereby ZT is increased more than 50%. The main reason for this effect is samples porosity reduction with the compacting pressure increase.

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1 Acta Physica Polonica A

1 2014

1 Bushinski M.

1 Fedotov A.

1 Fedotova V.

1 Koltunowicz T.

1 Mazanik A.

1 Saad A.

1 Svito I.

1 Troyanchuk I.

1 Zukowski P.

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Thermoelectric Properties of Ca_3Co_4O_9-Based Ceramics Doped with Fe and/or Y