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

• Authors: A. Fedotov , A. Fedotov , A. Mazanik , I. Svito , A. Saad , I. Troyanchuk , M. Bushinski , V. Fedotova , P. Zukowski , T. Koltunowicz
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

46.25.Hf; 62.20.D-; 82.45.Xy

Discipline

• 62.20.D-: Elasticity(for materials treatment effects on elastic properties, see 81.40.Jj)
• 46.25.Hf: Thermoelasticity and electromagnetic elasticity (electroelasticity, magnetoelasticity)
• 82.45.Xy: Ceramics in electrochemistry(see also 81.05.Je Ceramics and refractories, and 81.05.Mh Cermets, ceramic and refractory composites in specific materials)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 6
• Pages: 1344-1347

Dates

published

2014-06

Contributors

author

A. Fedotov

• Belarusian State University, Independence av. 4, 220030 Minsk, Belarus

author

A. Fedotov

• Belarusian State University, Independence av. 4, 220030 Minsk, Belarus

author

A. Mazanik

• Belarusian State University, Independence av. 4, 220030 Minsk, Belarus

author

I. Svito

• Belarusian State University, Independence av. 4, 220030 Minsk, Belarus

author

A. Saad

• Al-Balqa Applied University, P.O. Box 4545, Amman 11953, Jordan

author

I. Troyanchuk

• Scientific-Practical Materials Research Center of NASB, 220072 Minsk, Belarus

author

M. Bushinski

• Scientific-Practical Materials Research Center of NASB, 220072 Minsk, Belarus

author

V. Fedotova

• Scientific-Practical Materials Research Center of NASB, 220072 Minsk, Belarus

author

P. Zukowski

• Department of Electrical Devices and High Voltages Technologies, Lublin University of Technology Nadbystrzycka 38a, 20-618 Lublin, Poland

author

T. Koltunowicz

• Department of Electrical Devices and High Voltages Technologies, Lublin University of Technology Nadbystrzycka 38a, 20-618 Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.125.1344