Effect of Ca substitution by Fe on the thermoelectric properties of Ca3Co4O9 ceramics

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

doi:10.1007/s10832-018-0109-2

Cited by 23 publications

(23 citation statements)

References 49 publications

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“…3. In the graph, it can be observed that all samples show semiconducting-like behavior in the whole measured temperature range, in agreement with previous works [16,27]; however, it is much less evident for M1 samples. Moreover, in spite of their higher content in Ca 3 Co 2 O 6 secondary phase, M1 samples display the lowest electrical resistivity among all samples, while S1 ones possess the highest ones.…”

Section: Resultssupporting

confidence: 91%

“…Moreover, the S values are increased when the temperature is raised, with very similar behavior for P1, and P2 samples, confirming that the substrate influences the properties of sintered coatings, and that the amount of solid in the initial suspension has a negligible effect on the S values. When evaluating the maximum S values at 800 ºC (212 V/K) measured in P1 samples, they are higher than the measured in sintered materials (180-190 V/K) [13,27], and highly textured materials through hot-pressing (170 V/K) [13], or SPS (165 V/K) [29].…”

Section: Resultsmentioning

confidence: 80%

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Effect of substrate on the microstructure and thermoelectric performances of Sr-doped Ca3Co4O9 thick films

Torres

Mora

Amaveda

et al. 2019

Ceramics International

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Ca 3 Co 4 O 9 thermoelectric materials in form of thick films are very promising in practical applications due to their low costs and relatively high performance. In this work, two different suspensions have been used to produce different coatings on Al 2 O 3 polycrystalline substrates with theoretical green thickness of 360 and 2000 µm. Moreover, the effect of substrate has also been investigated using Al 2 O 3 monocrystalline substrates and a 360 µm green thickness. Sintering procedure at 900 ºC for 24 h has drastically decreased coating thickness. XRD performed on the coatings surface has shown the formation of small amounts of Ca 3 Co 2 O 6 secondary phase on the polycrystalline substrates, while it was more abundant, and accompanied by Ca 2 Co 2 O 5 on the monocrystalline substrates. In spite of the higher secondary phases content, monocrystalline substrates produced a slight grain orientation which led to the highest thermoelectric properties between the samples (0.38 mW/K 2 m at 800 ºC), and very close to the best reported values in the literature.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 80%

Effect of substrate on the microstructure and thermoelectric performances of Sr-doped Ca3Co4O9 thick films

Torres

Mora

Amaveda

et al. 2019

Ceramics International

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“…Among them, CaMnO 3 can be synthesized in atmospheric condition and shows brilliant TE properties, which makes the CaMnO 3 a forthcoming competitor as an N‐type oxide TE material. (Ca 1 − x Sr x ) 3 Co 4 O 9 polycrystalline has been fabricated by using spark plasma sintering method to substitute Ca by Sr, and the result demonstrated that the ZT achieves 0.22 at 1000 K for the composition (Ca 0.995 Sr 0.005 ) 3 Co 4 O 9 . However, the fabrication of modules based on oxide materials has only recently begun to emerge, and there exist very few reports concerning the performance of these materials …”

Section: Development Of Thermoelectric Materialsmentioning

confidence: 99%

A comprehensive review of solar thermoelectric cooling systems

Sârbu

Dorca

2017

Int J Energy Res

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Summary The negative environmental impacts of burning fossil fuels have forced the energy research community seriously to consider renewable sources, such as naturally available solar energy. This paper provides an overview of solar thermoelectric (TE) cooling systems. Thus, this review presents the details referring to TE cooling parameters and formulations of the performance indicators and focuses on the development of TE cooling systems in recent decade with particular attention on advances in materials and modeling and design approaches. Additionally, the TE cooling applications have been also reviewed in aspects of electronic cooling, domestic refrigeration, air conditioning, and power generation. Finally, the possibility of solar TE cooling technologies application in “nearly zero” energy buildings is briefly discussed, and some future research directions are included. This research shows that TE cooling systems have advantages over conventional cooling devices, including compact in size, light in weight, high reliability, no mechanical moving parts, no working fluid, being powered by direct current, and easily switching between cooling and heating modes.

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“…The physical properties found in these materials are varied, including the change in the spin states of cobalt ions, insulator-metal phase transitions as well as various types of orbital, charge, and electric ordering. In this regard, cobalt perovskite oxides are considered as promising thermoelectric materials since the discovery of large S and PF in the metallic oxide Na x CoO 2 in 1997 [6] as many other cobalt oxides such as Ca 3 Co 4 O 9 [7][8][9][10][11], [Sr 2 O 2 ] q CoO 2 [12], Bi 2 Sr 2 Co 2 O y -like [13][14][15], and more recently Ba 2 Co 9 O 14 [16,17] or Na-doped CoO [18].…”

Section: Introductionmentioning

confidence: 99%

Ba substitution for enhancement of the thermoelectric properties of LaCoO3 ceramics (0⩽x⩽0.75)

et al. 2019

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In the present work, dense perovskite ceramics were successfully prepared from a series of La 1−x Ba x CoO 3 solid solutions in the range of substitution 0 ≤ x ≤ 0.75 using solid state reaction and conventional sintering. Structural properties of La 1−x Ba x CoO 3 were systematically investigated and thermoelectric properties were measured in the temperature range of 330-1000 K. The results show that the thermoelectric properties of Ba-substituted LaCoO 3 depend on x. Indeed, at 330 K, electrical conductivity presents an optimum value for x = 0.25 with a value of σ max ≈ 2.2×10 5 S•m-1 whereas the Seebeck coefficient decreases when x and/or the temperature increases. The Ba-substituted LaCoO 3 samples exhibit p-type semiconducting behaviour. The best power factor value found is 3.4×10-4 W•m-1 •K-2 at 330 K for x = 0.075, which is 10% higher than the optimum value measured in La 1-x Sr x CoO 3 for x = 0.05. The thermal diffusivity and thermal conductivity increase with increasing temperature and Ba concentration. La 1−x Ba x CoO 3 shows a maximum figure of merit (ZT = 0.048) for x = 0.05 at 330 K, 25% higher than the best value in La 1-x Sr x CoO 3 compounds.

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Effect of Ca substitution by Fe on the thermoelectric properties of Ca3Co4O9 ceramics

Cited by 23 publications

References 49 publications

Effect of substrate on the microstructure and thermoelectric performances of Sr-doped Ca3Co4O9 thick films

Effect of substrate on the microstructure and thermoelectric performances of Sr-doped Ca3Co4O9 thick films

A comprehensive review of solar thermoelectric cooling systems

Ba substitution for enhancement of the thermoelectric properties of LaCoO3 ceramics (0⩽x⩽0.75)

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