Synthesis, mechanical and magnetic properties of transition metals-doped Ca3Co3.8M0.2O9

Pinitsoontorn, Supree; Lerssongkram, N.; Harnwunggmoung, Adul; Kurosaki, Ken; Yamanaka, Shinşuke

doi:10.1016/j.jallcom.2010.05.027

Cited by 54 publications

(38 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There have been a few experimental studies on partial substitution at the Co-site [6,9,24,[27][28][29][30][31][32], but very few studies reported a complete set of thermoelectric properties (resistivity, thermopower, and thermal conductivity) and the figure-of-merit at high temperature [9,24,30]. Thus, in this paper, following our previous work on synthesis, mechanical and magnetic properties [33], we focused on the thermoelectric properties of Ca 3 Co 4-x M x O 9?d (where M is Cr, Fe, Ni, Zn, and Cu). The concentration of the doped transition metals was maintained at x = 0.2 to study the effect of different elemental substitution on the thermoelectric properties.…”

Section: Introductionmentioning

confidence: 88%

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Pinitsoontorn

Lerssongkram

Keawprak

et al. 2011

J Mater Sci: Mater Electron

Self Cite

View full text Add to dashboard Cite

The thermoelectric properties of the Ca 3 Co 4 O 9?d and the transition metals-doped Ca 3 Co 3.8 M 0.2 O 9?d (where M = Cr, Fe, Ni, Cu and Zn) ceramics were reported. Ca 3 Co 4 O 9?d single phase was checked by using X-ray diffraction analysis performed for the Ca 3 Co 3.8-M 0.2 O 9?d samples. The scanning electron micrographs showed some degrees of grains alignment in the compacted direction. The resistivity of the samples measured from 100 up to 700°C varies in magnitude for different transition metals substitution. The variation of resistivity was explained by a change of carrier concentration induced by the doped ions. The thermopower increased with increasing temperature but showed no obvious change for any transition metals doping. The thermal conductivities changed for the doped samples but were relatively independent of temperature. The ZT was calculated to be the highest for the Fe substitution for the whole measurement temperature with the maximum value of 0.12 at 700°C.

show abstract

Section: Introductionmentioning

confidence: 88%

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Pinitsoontorn

Lerssongkram

Keawprak

et al. 2011

J Mater Sci: Mater Electron

Self Cite

View full text Add to dashboard Cite

show abstract

“…1 TE materials need a high thermopower S and low resistivity q and thermal conductivity j in order to exhibit a high figure of merit ZT (¼S 2 /qj), which is usually used to characterize the performance of the TE material, and ZT > 1 is one of the criteria for the practical application of TE materials. 2,3 However, both thermopower and resistivity in the general material are functions of carrier concentration, and they can hardly be optimized at the same time. Layered cobaltites show a large room-temperature thermopower (larger than that of conventional metals) coexisting with a metallic-like electric conductivity and a very low thermal conductivity and have been widely considered as a potential candidate for TE materials, 3,4 especially in oxidizing atmospheres, due to their high chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Tunning of microstructure and thermoelectric properties of Ca3Co4O9 ceramics by high-magnetic-field sintering

Huang

Zhao

Fang

et al. 2011

Journal of Applied Physics

View full text Add to dashboard Cite

The structural, magnetic, electrical, and thermal transport properties of Ca 3 Co 4 O 9 ceramics sintered under high magnetic field were investigated. Crystal grain texturing and densification were achieved through cold-pressing and high-magnetic-field sintering techniques. The c-axis of the layered crystal grain was partly oriented along the c-axis of the pressed samples via a cold-pressing technique, and the degree of orientation was further increased while applying the magnetic field in the sample sintering progress. The easy magnetization axis of Ca 3 Co 4 O 9 polycrystalline ceramics was found to be the c-axis. The room-temperature resistivity along the ab-plane of the sample sintered under 8 T magnetic field was about 30% smaller than that of the sample sintered without magnetic field, and the Seebeck coefficient of the former reached 177.7 lV/K at the room temperature, which is about 50% larger than that of the latter. Consequently, for the sample sintered at 8 T magnetic field, the power factor along the ab-plane was enhanced by about 1.8 times compared to the sample without magnetic field sintering. The obtained result is suggested to originate from the variations of the carrier mobility and spin-orbital degeneracy due to high-magnetic-field sintering in the progress of the sample preparation.

show abstract

“…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. Wang et al [10,23], Pinistoontorn et al [24,25] and Bhaskar et al [3][4][5] also reported that the bulk density of samples is in the range of ca. 3.2-3.8 g/cm 3 for the doped and undoped Ca 3 Co 4 O 9þ δ samples; these values are in the range from 65% to 80% of theoretical density.…”

Section: Methodsmentioning

confidence: 99%

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

Bhaskar

Yang

2015

Ceramics International

View full text Add to dashboard Cite

Synthesis, mechanical and magnetic properties of transition metals-doped Ca3Co3.8M0.2O9

Cited by 54 publications

References 29 publications

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Thermoelectric properties of transition metals-doped Ca3Co3.8M0.2O9+δ (M = Co, Cr, Fe, Ni, Cu and Zn)

Tunning of microstructure and thermoelectric properties of Ca3Co4O9 ceramics by high-magnetic-field sintering

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

Contact Info

Product

Resources

About