Sintering behavior, microstructure and thermoelectric properties of calcium cobaltite thick films for transversal thermoelectric multilayer generators

Schulz, T.; Reimann, Timmy; Bochmann, A.; Vogel, Andre C.; Capraro, Beate; Mieller, Björn; Teichert, S.; Töpfer, J.

doi:10.1016/j.jeurceramsoc.2017.11.017

Cited by 21 publications

(26 citation statements)

References 29 publications

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“…On the other hand, they are close to the reported for bulk textured materials produced by hot uniaxial pressing or spark plasma sintering (SPS), 6.9, and 7 mΩ·cm, respectively . Furthermore, they are higher than the obtained in multilayer materials prepared through tape casting and processed by hot pressing (5.9 mΩ·cm) …”

Section: Resultssupporting

confidence: 80%

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Enhancement of electrical conductivity of Ca_2.93Sr_0.07Co₄O₉ thick films via hot uniaxial pressing

Mora

Amaveda

Torres

et al. 2019

Int J Applied Ceramic Tech

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Sr-doped Ca 3 Co 4 O 9 thermoelectric thick films have been prepared by dip-coating technique, followed by sintering and hot uniaxial pressing. XRD patterns are very similar in both types of samples, with only differences in the relative intensity of peaks, pointing out to a better grain orientation in hot-pressed films. Moreover, SEM observation showed a drastic decrease in the hot-pressed films thickness. Electrical resistivity is decreased in textured materials due to the higher grain orientation and density, confirmed through Hall measurements. On the other hand, Seebeck coefficient is maintained practically unchanged. Power factor at 800°C is much higher in textured materials (0.44 mW/K 2 m) than determined in sintered films (0.30 mW/ K 2 m), and in the order of the best typically reported in the literature (0.43 mW/K 2 m). K E Y W O R D S ceramics, electrical properties, microstructure, oxides, thermoelectrics, thick films How to cite this article: Mora M, Amaveda H, Torres MA, Madre MA, Marinel S, Sotelo A. Enhancement of electrical conductivity of Ca 2.93 Sr 0.07 Co 4 O 9 thick films via hot uniaxial pressing. Int J Appl Ceram Technol.

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Section: Resultssupporting

confidence: 80%

“…Moreover, they can be textured to exploit their crystal anisotropy, which is reflected in the anisotropy of electrical and thermal properties . Furthermore, they can be produced in the form of thick films, decreasing the raw materials needs, and allowing automatic production.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of electrical conductivity of Ca_2.93Sr_0.07Co₄O₉ thick films via hot uniaxial pressing

Mora

Amaveda

Torres

et al. 2019

Int J Applied Ceramic Tech

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“…Other possibility to further reduce the costs associated to the fabrication processes is the use of thick films which, besides their low costs, offer the possibility of automatic large scale production. Moreover, the production technology of thick films is well-known, while their reliability has been proved for long time in hybrid circuits and silicon solar cells [18] and, more recently, in thermoelectric materials [19,20].…”

Section: Introductionmentioning

confidence: 99%

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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“…Casting a slurry composed of anisotropic particles and organic binders by the doctor-blade method into a tape is a well-known technique to texture materials. [15][16][17] The effect can be enforced by implementing a fraction of large anisotropic grains (>10 µm), known as templated grain growth. 18 The tape-cast specimens by Schulz et al 16 showed anisotropic microstructure and high porosity (45%).…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17] The effect can be enforced by implementing a fraction of large anisotropic grains (>10 µm), known as templated grain growth. 18 The tape-cast specimens by Schulz et al 16 showed anisotropic microstructure and high porosity (45%). Due to the latter, electrical conductivity and PF were not improved compared with the dry-pressed reference (300 MPa).…”

Section: Introductionmentioning

confidence: 99%

Influence of pressure and dwell time on pressure‐assisted sintering of calcium cobaltite

et al. 2020

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Sintering behavior, microstructure and thermoelectric properties of calcium cobaltite thick films for transversal thermoelectric multilayer generators

Cited by 21 publications

References 29 publications

Enhancement of electrical conductivity of Ca_2.93Sr_0.07Co₄O₉ thick films via hot uniaxial pressing

Enhancement of electrical conductivity of Ca_2.93Sr_0.07Co₄O₉ thick films via hot uniaxial pressing

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

Influence of pressure and dwell time on pressure‐assisted sintering of calcium cobaltite

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Sintering behavior, microstructure and thermoelectric properties of calcium cobaltite thick films for transversal thermoelectric multilayer generators

Cited by 21 publications

References 29 publications

Enhancement of electrical conductivity of Ca2.93Sr0.07Co4O9 thick films via hot uniaxial pressing

Enhancement of electrical conductivity of Ca2.93Sr0.07Co4O9 thick films via hot uniaxial pressing

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

Influence of pressure and dwell time on pressure‐assisted sintering of calcium cobaltite

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Enhancement of electrical conductivity of Ca_2.93Sr_0.07Co₄O₉ thick films via hot uniaxial pressing

Enhancement of electrical conductivity of Ca_2.93Sr_0.07Co₄O₉ thick films via hot uniaxial pressing