Improvement of the thermoelectric properties of [Bi1.68Ca2O4−δ]RS[CoO2]1.69 cobaltite by chimie douce methods

Muguerra, H.; Rivas‐Murias, B.; Traianidis, Maria; Henrist, Catherine; Vertruyen, Bénédicte; Cloots, Rudi

doi:10.1016/j.jssc.2010.03.030

Cited by 12 publications

(5 citation statements)

References 41 publications

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“…Therefore, a comparison between the c-axis lattice parameter of the films and single crystals is justified. This lattice parameter is very sensitive to the chemical composition23242526, and then it is helpful to further refine the stoichiometry obtained from EDS. By combining these two methods,the final stoichiometry of the films was estimated as: [Ca 2 CoO 3 ][CoO 2 ] 1.62 , [Sr 2 CoO 3 ][CoO 2 ] 1.8 , [Bi 1.68 Ca 2 O 4 ][CoO 2 ] 1.69 , [Bi 1.74 Sr 2 O 4 ][CoO 2 ] 1.82 , and [Bi 2 Ba 1.8 Co 0.2 O 4 ][CoO 2 ] 2 .…”

Section: Resultsmentioning

confidence: 99%

High quality thin films of thermoelectric misfit cobalt oxides prepared by a chemical solution method

Rivas‐Murias

Vila-Fungueiriño

Rivadulla

2015

Sci Rep

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Misfit cobaltates ([Bi/Ba/Sr/Ca/CoO]nRS[CoO2]q) constitute the most promising family of thermoelectric oxides for high temperature energy harvesting. However, their complex structure and chemical composition makes extremely challenging their deposition by high-vacuum physical techniques. Therefore, many of them have not been prepared as thin films until now. Here we report the synthesis of high-quality epitaxial thin films of the most representative members of this family of compounds by a water-based chemical solution deposition method. The films show an exceptional crystalline quality, with an electrical conductivity and thermopower comparable to single crystals. These properties are linked to the epitaxial matching of the rock-salt layers of the structure to the substrate, producing clean interfaces free of amorphous phases. This is an important step forward for the integration of these materials with complementary n-type thermoelectric oxides in multilayer nanostructures.

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Section: Resultsmentioning

confidence: 99%

High quality thin films of thermoelectric misfit cobalt oxides prepared by a chemical solution method

Rivas‐Murias

Vila-Fungueiriño

Rivadulla

2015

Sci Rep

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“…Taking into account that the synthesis does not modify appreciably the density of the samples, the narrower particle size distribution of the spray-drying method should explain this feature [26]. Indeed, homogeneous small grains allow a better electrical connectivity between grains and more homogeneous grain boundaries [27].…”

Section: Thermoelectric Propertiesmentioning

confidence: 99%

Thermoelectric properties of n-type Ca1−xDyxMn1−yNbyO3−δ compounds (x=0, 0.02, 0.1 and y=0, 0.02) prepared by spray-drying method

Muguerra

Rivas‐Murias

Traianidis

et al. 2011

Journal of Alloys and Compounds

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“…To improve functional (thermoelectric) properties of ceramic materials based on these layered compounds one can use solution method synthesis instead of traditional solid-state reactions method [15,17], special methods of thermal treatment and sintering of ceramics [17], as well as chemical substitution of different ions in their structure [6,11,12,14].…”

Section: Introductionmentioning

confidence: 99%

“…x M x Co 2 O 8-δ (M = Sc 3+ , Y 3+ , or La 3+ ) ceramics at room temperature were less than 10 S/cm [19]. Such values of electrical conductivity of ceramics are insufficiently large to use it in TEGs, but they can be improved using special methods of synthesis [15,17] or sintering of ceramics [17] as well as by means of addition of noble metals powders (in particular, Ag) to the ceramics [18].…”

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confidence: 99%

Thermoelectric Ceramics Based on the Layered Cobaltates of Bismuth and Alkaline-Earth Metals

Klyndyuk¹,

Чижова²,

Krasutskaya³

2017

ujms

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Using solid-state reactions method the ceramic samples of (Bi,Pb) 2 Ba 2 (Co,M) 2 O y , (Bi,Pb) 2 Sr 2 (Co,M) 1.8 O y , and (Bi,Pb) 2 Ca 2 (Co,M) 1.7 O y (M = Mn, Zn) solid solutions had been prepared, their lattice constants had been determined and their thermal expansion, electrical conductivity and thermo-EMF had been measured, and their power factor had been calculated. Effect of the bismuth substitution by lead and cobalt substitution by manganese and zinc in the layered cobaltates of bismuth and alkaline-earth metals (AEM) on the crystal structure and physicochemical and functional properties of their derivatives was analyzed. It was found that cobaltates studied are p-type conductors, which linear thermal expansion coefficient (LTEC) values varied within (9.68-13.2)•10-6 K-1. Power factor values for the samples studied unmonotonously changed when temperature increased and at 1000 K were maximal for Bi 2 Ba 2 Co 2 O y , Bi 2 Sr 2 Co 1.7 Mn 0.1 O y , and Bi 2 Ca 2 Co 1.7 O y compounds − 12.1, 10.1, and 10.6µW/(m⋅K 2) respectively.

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Improvement of the thermoelectric properties of [Bi1.68Ca2O4−δ]RS[CoO2]1.69 cobaltite by chimie douce methods

Cited by 12 publications

References 41 publications

High quality thin films of thermoelectric misfit cobalt oxides prepared by a chemical solution method

High quality thin films of thermoelectric misfit cobalt oxides prepared by a chemical solution method

Thermoelectric properties of n-type Ca1−xDyxMn1−yNbyO3−δ compounds (x=0, 0.02, 0.1 and y=0, 0.02) prepared by spray-drying method

Thermoelectric Ceramics Based on the Layered Cobaltates of Bismuth and Alkaline-Earth Metals

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