Thermoelectric properties of Ca3Co4O9–Co3O4 composites

Delorme, Fabian; Díaz-Chao, P.; Guilmeau, Emmanuel; Giovannelli, Fabien

doi:10.1016/j.ceramint.2015.04.091

Cited by 63 publications

(37 citation statements)

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“…The thermoelectric performance of a material can be assessed by the figure were not considered as potential thermoelectric materials before the discovery of large Seebeck coefficient and power factor in the metallic oxide Na x CoO 2 in 1997 [1]. Several other p-type layered cobalt oxides with high thermoelectric properties have been developed [2][3][4][5][6][7][8][9][10][11].…”

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Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

et al. 2018

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Abstract:In this work, we synthesized cubic perovskite ceramics of the whole La 1-x Sr x CoO 3 (0 ≤ x ≤ 1) solid solution for the first time. Synthesis was carried out by solid state reaction and conventional sintering to reach dense ceramics. For x > 0.8, it was necessary to substitute 3% cobalt by silicon to stabilize the cubic perovskite structure. Electrical conductivity increased with Sr content to reach 3×10 5 S·m -1 at 330 K for x = 0.3. However, the optimum electrical properties have been found for x = 0.05 at 330 K with PF max = 3.11×10 -4 W·m -1 ·K -2 . Indeed, the Seebeck coefficient was decreasing when x increased to reach values close to 0 for x ≥ 0.3. Thermal conductivity was low at low temperature (≈ 2.5 Wm -1 ·K -1 ) and increased up to 6.5 W·m -1 ·K -1 when temperature increased. As the highest power factor was reached at low temperature as well as the lowest thermal conductivity, La 1-x Sr x CoO 3 compounds with low x values appeared as very promising thermoelectric materials around room temperature, on the contrary to layered cobalt oxides. For high x values, Seebeck coefficient values close to zero made these materials unsuitable for thermoelectric applications.

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Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

et al. 2018

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“…The identification of this phase is very typical in the available literature [23], while it is not appearing in the AT samples probably due to the higher homogeneity and lower grain sizes of the precursors mixture. Other possibilities to avoid the Ca 3 Co 2 O 6 phase presence is the addition of Co 3 O 4 [24], which enhances the reaction to produce the Ca 3 Co 4 O 9 one. The presence of Ca 3 Co 2 O 6 phase in CS samples can be explained taking into account that the Ca 3 Co 4 O 9 phase formation is limited by the oxygen diffusion into the sample, and it is much slower when the grain sizes are larger.…”

Section: Resultsmentioning

confidence: 99%

Fast preparation route to high-performances textured Sr-doped Ca3Co4O9 thermoelectric materials through precursor powder modification

Torres

Garcia²,

Urrutibeascoa

et al. 2018

Sci. China Mater.

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“…However, their TE performances are lower than those determined in intermetallic materials. Consequently, most of the works published in this eld are dealing with the improvement of their TE performances through many different ways [7][8][9][10][11][12][13].…”

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confidence: 99%

Effect of B4C addition on mechanical and electrical properties of Ca3Co4O9

Amaveda¹,

Mora²,

Durá³

et al. 2020

Preprint

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B4C added Ca3Co4O9 in different proportions (0, 0.1, 0.25, 0.5, and 0.75 wt.%) have been fabricated using solid-state method. Powder XRD patterns have shown that only Ca3Co4O9 phase can be identified in all the samples. Microstructural observations have allowed determining that B4C compound has been superficially oxidized, producing liquid B2O3 phase during sintering, which has reacted with the Ca3Co4O9 grains to produce bridges between them. In spite of the increase of porosity, these bridges led to an important raise (more than two times) of mechanical properties. On the other hand, while B4C addition has not significantly influenced S values, it has decreased electrical resistivity, thermal conductivity, and thermal expansion. Consequently, ZT values have been also increased, reaching 0.24 in 0.25 wt.% B4C containing samples, which is very close to the best values reported in the literature for Ca3Co4O9 compounds, and two times higher than the obtained in pure materials in this work.

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Thermoelectric properties of Ca3Co4O9–Co3O4 composites

Cited by 63 publications

References 49 publications

Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

Synthesis, sintering, and thermoelectric properties of the solid solution La1–xSr x CoO3±δ (0 ≤ x ≤ 1)

Fast preparation route to high-performances textured Sr-doped Ca3Co4O9 thermoelectric materials through precursor powder modification

Effect of B4C addition on mechanical and electrical properties of Ca3Co4O9

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