Relation between Seebeck Coefficient and Lattice Parameters of (Ca2−y Sr y CoO3) x CoO2

Kwon, O-Jong; Jo, Wook; Yoon, Sejin; Shin, Dongmin; You, Hojun; Choi, Kyeongdal; J, Kim; Park, Chan

doi:10.1007/s11664-012-1983-z

Cited by 8 publications

(3 citation statements)

References 13 publications

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“…Anyway, these variations are small enough to assume that density values practically have no effect on the electrical behaviour of the samples. µV/K) is slightly higher than those reported elsewhere for Sr-doped samples (~ 130 µV/K) at the same temperature [36]. The maximum measured Seebeck coefficient value (~ 220 µV/K) at 800 ºC corresponds to the 0.07 Sr-doped samples, around 10 % higher than the obtained for the undoped ones.…”

Section: Resultscontrasting

confidence: 60%

“…The maximum increase is obtained for the 0.07 Sr-doped samples (~ 33 % higher than the undoped ones). The highest PF value obtained at 800 ºC (around 0.30 mW/K 2 .m) for the 0.07 Sr-doped samples is about 15 % higher than the highest values reported for Sr-doped samples prepared using the conventional solid state method (~ 0.26 mW/K 2 .m) [36] and relatively close to the values obtained in samples sintered and textured by spark plasma sintering (~ 0.32 mW/K 2 .m) [37].…”

Section: Resultsmentioning

confidence: 55%

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Effect of Sr substitution for Ca on the Ca3Co4O9 thermoelectric properties

Constantinescu¹,

Rasekh²,

Torres

et al. 2013

Journal of Alloys and Compounds

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Ca 3-x Sr x Co 4 O 9 polycrystalline thermoelectric ceramics with small amounts of Sr have been synthesized by the classical solid state method. Microstructural characterizations have shown that all the Sr has been incorporated into the Ca 3 Co 4 O 9 and Ca 3 Co 2 O 6 structures and no Sr-based secondary phases have been produced. Apparent density measurements have shown that samples slightly increase their density until 0.05 Sr content, decreasing for higher contents. Electrical resistivity decreases and Seebeck coefficient slightly raises when Sr content increases until 0.07 Sr addition. The improvement in both parameters leads to higher power factor values than the usually obtained in samples prepared by the conventional solid state routes and close to those obtained in textured materials.

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Section: Resultscontrasting

confidence: 60%

Section: Resultsmentioning

confidence: 55%

Effect of Sr substitution for Ca on the Ca3Co4O9 thermoelectric properties

Constantinescu¹,

Rasekh²,

Torres

et al. 2013

Journal of Alloys and Compounds

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“…Other authors ,− employ a modified Heikes formula, in which the Seebeck coefficient is given as α = prefix− k normalB e .25em ln ( β x 1 − x ) Here, x is the concentration of holes (corresponding to Co 4+ ) and β = g 3 / g 4 is the ratio of the local degeneracy of the electronic configuration of Co 3+ and Co 4+ . This modified version of Heikes’ formula is the high-temperature limit calculated from the Hubbard model.…”

Section: Introductionmentioning

confidence: 99%

Electronic Transport Properties of [Ca₂CoO_3−δ]_q[CoO₂]

et al. 2014

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This work was carried out within the project "Thermoelectric Oxides for High Temperature Waste Heat Recovery" (THERMEL), funded by the RENERGI programme of the Norwegian Research Council. Firstly, I would like to thank my supervisors, Terje Finstad and Truls Norby, for allowing me to work independently and develop my own ideas, but providing interest, advice, and guidance, whenever I got lost on the way. I am also grateful for the privilege to work in the social, helpful, and inspiring environment of the FASE group. Thanks to all previous and present members for making this a nice place to work and-of course-for uncounted coffee breaks, foosball matches, and social gatherings. Especially, I thank Harald Fjeld, for being a great office mate, patient teacher of (defect) chemistry, and omniscient lab-encyclopedia. It is safe to say that this thesis would have looked different without you! A big thank you also to our cohabitants from the structural physics group, especially Ole-Bjørn Karlsen and Kjetil Valset, for providing practical assistance and help. Simone Casolo deserves my deep respect for patiently enduring my endless questions around his DFT results. My stay in the group of Sean Li in Sydney was pleasant, interesting, and scientifically productive. I'd like to thank all the people I met there, who helped making me feel at home at the other side of the world within only three months. I am also happy to have met Leyre Sagarna and Christophe Heinrich on conferences, sharing the experience and struggles of being a PhD-student and resulting in minicollaborations. Further, I am deeply indebted to my parents and family for almost three decades of unconditional support and advice. Finally, I thank my friends and especially Tina for simply being there. Oslo, March 2014 Matthias Schrade iii Here, α is the Seebeck coefficient, ρ the electrical resistivity, and κ the thermal conductivity. The index n (or p) indicates the n-type (or p-type) leg. The effective figure of merit Z is usually close to the average of the individual figures of merit z of the p-and n-materials. Thus, the by far most reported number in thermoelectric

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