Effect of the Addition of Copper Particles on the Thermoelectric Properties of the Ca3Co4O9 + δ Ceramics Produced by Two-Step Sintering

Klyndyuk, A. I.; Чижова, Е. А.; Latypov, R. Sh.; Shevchenko, S. V.; Kononovich, V. M.

doi:10.1134/s0036023622020073

Cited by 11 publications

(3 citation statements)

References 34 publications

(50 reference statements)

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“…where L is Lorentz number (L = 2.45 × 10 -8 W × Ω × K -2 ). The values of power factor (P) and figure of merit (ZT) of the Na 0.55 Co 0.9 M 0.1 O 2 layered oxides were calculated as P = S 2 /ρ (10) and ZT = (P × T)/λ. (11)…”

Section: Methodsmentioning

confidence: 99%

“…Traditional thermoelectrics on the base of layered chalcogenides of bismuth and tellurium possess several drawbacks since they contain toxic, rare, and expensive components, are unstable in the air at high temperatures due to oxidation by atmospheric oxygen, etc. Nevertheless, such drawbacks are absent for oxide thermoelectrics [9][10][11][12][13]. One of the well-known representatives of thermoelectrics is layered sodium cobaltite first characterized by Terasaki et al [14].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the reflexes of the impurity phase, Co 3 O 4 , were identified in their powder diffractograms. P = S 2 /ρ (10) and…”

mentioning

confidence: 99%

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Enhanced Thermoelectric Performance of Na0.55CoO2 Ceramics Doped by Transition and Heavy Metal Oxides

Krasutskaya,

Klyndyuk,

Evseeva

et al. 2024

Solids

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Using the solid-state reactions method Na0.55(Co,M)O2 (M = Cr, Ni, Zn, W, and Bi) ceramics were prepared and their crystal structure, microstructure, electrophysical, thermophysical, and thermoelectric properties were studied. Doping of Na0.55CoO2 by transition or heavy metal oxides led to the increase in the grain size of ceramics, a decrease in electrical resistivity and thermal diffusivity values, and a sharp increase in the Seebeck coefficient, which resulted in essential enhancement of their thermoelectric properties. The largest power factor (1.04 mW/(m·K2) at 1073 K) and figure of merit (0.702 at 1073 K) among the studied samples possessed the Na0.55Co0.9Bi0.1O2 compound, which also demonstrated the highest values of the Seebeck coefficient (666 μV/K at 1073 K). The obtained results show that the doping of layered sodium cobaltite by different metal oxides allows for improving its stability, microstructure, and functional properties, which proves the effectiveness of the doping strategy for developing new thermoelectric oxides with enhanced thermoelectric performance.

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Section: Methodsmentioning

confidence: 99%