Thermoelectric Properties (Resistivity and Thermopower) in (Bi1.5Pb0.5Ca2−MCo2O8− (M=Sc3+, Y3+, or La3+)

Iguchi, E.; Katoh, S.; Nakatsugawa, Hiroshi; Munakata, Fumio

doi:10.1006/jssc.2002.9664

Cited by 2 publications

(2 citation statements)

References 30 publications

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“…8. The largest ZT value belongs to the B sample (x=0.05) as 0.0125 at 300 K, which is slightly higher than the reported values for melt quenched samples (0.010) [39].…”

Section: Resultscontrasting

confidence: 60%

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Özçelik¹,

Depçi̇²,

Gül³

et al. 2022

Phys. Scr.

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The effect of K substitution for Ca in Bi2Ca2-xKxCo2Oy (x= 0.0, 0.05,0.075, 0.10, and 0.125) thermoelectric ceramics, produced via laser floating zone (LFZ) method, have been systematically investigated. XRD patterns are quite similar for all samples and main peaks in the patterns correspond to reflection planes of the thermoelectric phase together with small amount of secondary phases. SEM micrographs revealed well oriented grains along the growth direction, and the presence of three different contrasts, associated through EDS to different phases, namely, black (Co oxide), white (Bi poor phase) and grey (Bi2Ca2Co1.7Oy TE phase). It was also seen that the amount of secondary phases diminishes with K-increase. The room-temperature resistivity values sharply decrease from 0.75 mΩ.m for the undoped sample to 0.44 mΩ.m for the 0.05 K-doped one, increasing for higher doping. Seebeck coefficient also decreases from 190 μV/K in the pristine sample, to 160 μV/K in all the K-doped ones, at 390 K. Thermal conductivity increases with temperature up to around 250 K, decreasing at higher temperatures. Thermal conductivity at 390 K decreases from 1.1 W/K-m in the pristine sample to lower values by K-doping, reaching the minimum, 0.9 W/K-m, in the 0.125 K-doped one. As a result, the highest ZT value of has been determined in 0.05 K-doped sample, around 0.021 at 390 K.

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“…8. The largest ZT value belongs to the B sample (x=0.05) as 0.0125 at 300 K, which is slightly higher than the reported values for melt quenched samples (0.010) [39].…”

Section: Resultscontrasting

confidence: 60%

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Özçelik¹,

Depçi̇²,

Gül³

et al. 2022

Phys. Scr.

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“…Secondly, large grain size in BPBLCO sample will enhance the electrical conductivity. Thirdly, since the ionic radius of La3+ is smaller than Ba2+, substitution of La for Ba will lead to the reduction of the ionic spaces between Co and O ions [14]. The theoretical calculation predicts the shrinkage of the charge-transfer energy gaps between O 2p and Co eg levels by the reduction in Co-O spaces [15].…”

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confidence: 99%

Thermoelectric Characteristics of Pb- and La-Doped Bi2Ba2Co2OY Ceramics

Hao

Zhao

2011

AMR

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Pb- and La-doped (Bi,Pb)2(Ba,La)2Co2Oy ceramics were prepared by solid-state reaction method and the effect of element doping on the thermoelectric characteristics was investigated. Pb and La doping increased the electrical conductivity and transformed the conduction from a metal-like behavior to a semiconducting one. Different from the undoped samples, the values of Seebeck coefficients decreased with the increase of the temperature in the Pb- and La-doped samples. Pb doping in Bi2Ba2Co2Oy system improved the thermoelectric characteristics at high temperature and Pb/La co-doping improved thermoelectric characteristics at low temperature.

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Thermoelectric Properties (Resistivity and Thermopower) in (Bi1.5Pb0.5Ca2−MCo2O8− (M=Sc3+, Y3+, or La3+)

Cited by 2 publications

References 30 publications

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Thermoelectric Characteristics of Pb- and La-Doped Bi<sub>2</sub>Ba<sub>2</sub>Co<sub>2</sub>O<sub>Y</sub> Ceramics

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Thermoelectric Properties (Resistivity and Thermopower) in (Bi1.5Pb0.5Ca2−MCo2O8− (M=Sc3+, Y3+, or La3+)

Cited by 2 publications

References 30 publications

Detailed low temperature studies on thermoelectric performance of K-doped Bi2Ca2Co2Oy ceramics fibers

Detailed low temperature studies on thermoelectric performance of K-doped Bi2Ca2Co2Oy ceramics fibers

Thermoelectric Characteristics of Pb- and La-Doped Bi<sub>2</sub>Ba<sub>2</sub>Co<sub>2</sub>O<sub>Y</sub> Ceramics

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Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers

Detailed low temperature studies on thermoelectric performance of K-doped Bi₂Ca₂Co₂O_y ceramics fibers