Texture, mechanical and thermoelectric properties of Ca3Co4O9 ceramics

Kenfaui, Driss; Chateigner, D.; Gomina, Moussa; Noudem, Jacques

doi:10.1016/j.jallcom.2009.10.048

Cited by 103 publications

(67 citation statements)

References 29 publications

(40 reference statements)

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“…E was two times larger for ceramics consolidated by SPS and reached 205.2 ± 5.6 GPa. This value is about 6 and 2.5 times larger than those reported for Bi 2 Te 3 30 and Ca 3 Co 4 O 9 ceramics, 23 respectively.…”

Section: Resultscontrasting

confidence: 53%

“…After the indentation load was removed, load-displacement (load-penetration depth) data were used to calculate the nanohardness, nH, and the elastic modulus (Young's modulus), E. Both properties were evaluated according to the formulae reported elsewhere. 23 The strength, r R , of the ceramics was measured using three-point bending tests. The tested bars were cut from the different samples with almost the same dimensions: thickness w % 2 mm and width B % 3 mm.…”

Section: Methodsmentioning

confidence: 99%

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Granular and Lamellar Thermoelectric Oxides Consolidated by Spark Plasma Sintering

Noudem

Kenfaui

Chateigner

et al. 2011

Journal of Elec Materi

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Using the spark plasma sintering (SPS) technique, dense nanostructured Ca 0.95 Sm 0.05 MnO 3 (n-type) and textured Ca 3 Co 4 O 9 (p-type) ceramics were prepared. Nanoceramic powders of doped n-type were synthesized using two routes: coprecipitation and solid-state reaction. The SPS method has been used to control the samples' densification and grain growth. Microstructural investigations reveal that the SPS technique results in high bulk density and homogeneous morphology for Ca 0.95 Sm 0.05 MnO 3 , and grain alignment for Ca 3 Co 4 O 9 . The thermoelectric and mechanical properties were investigated, showing a dependence on the starting grain size and being governed by the SPS conditions.

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Section: Resultscontrasting

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Granular and Lamellar Thermoelectric Oxides Consolidated by Spark Plasma Sintering

Noudem

Kenfaui

Chateigner

et al. 2011

Journal of Elec Materi

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“…This value is in relatively good agreement with earlier reports [3][4][5]. Kenfaui et al [21,22] fabricated Ca 3 Co 4 O 9 ceramics using solid-state reaction method and different sintering techniques such as conventional sintering (CS), hot pressing (HP), spark plasma sintering techniques (SPS). They have obtained the bulk density of 2.82 g/cm 3 (CS), 4.45 g/cm 3 (HP), 4.59 g/cm 3 (SPS), which corresponds to 60%, 95% and 98% of the theoretical density, respectively.…”

Section: Methodssupporting

confidence: 91%

High temperature thermoelectric properties of co-doped Ca3−xAgxCo3.95Fe0.05O9+δ (0≤x≤0.3)

Bhaskar

Yang

2015

Ceramics International

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“…Thermoelectric oxides, as a representative class of thermoelectric materials, have attracted increasing attention due to their outstanding advantages such as highly thermal and chemical stability and low toxicity compared to the intermetallic alloys. Recently, many kinds of thermoelectric oxides with highly thermoelectric performance have been reported, including NaCo 2 O 4 , Ca 3 Co 4 O 9−ı , Ca 2 Co 2 O 5 , Bi 2 Sr 2 Co 2 O y , TiSr 2 Co 2 O y , SrTiO 3 , CaMnO 3 , and so on [2][3][4][5][6]. Among them, the calcium cobalt oxide Ca 3 Co 4 O 9−ı is regarded as one of the promising candidates for thermoelectric application.…”

Section: Introductionmentioning

confidence: 99%