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Preparation and Properties of Thermoelectric Material Ca_(2-x)Sm_xCo_2O_5

Bo Li

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Abstract

Sm3+-doped thermoelectric powders of Ca2-xSmxCo2O5 were prepared by the citrate sol-gel method with citrate as com-plexing agent,glycol as dispersant and Ca(NO3)2.4H2O and Co(NO3)2.6H2O as reagents.Block samples were obtained by the com-pacting and sintering processes.Thermoelectric properties of Ca2-xSmxCo2O5,such as resistivity ρ,Seebeck coefficient S and power factor P were studied.Results show that when x=0.10-0.30,in contrast with the standard PDF 37-0668,all the X-ray diffraction peaks are consistent and do not shift.When x=0.45,new peaks of Sm3+ impurities appear.Sm3+ substitution greatly improves the ther-moelectric properties,reduces the resistivity,and enhances the Seebeck coefficient of Ca2Co2O5.The x=0.30 specimen has improved electrical properties.The highest power factor is 1.25 × 10-4 W/(m.K2) at 600 ℃ for sample Ca1.70Sm0.30Co2O5.

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Sm3+-doped thermoelectric powders of Ca2-xSmxCo2O5 were prepared by the citrate sol-gel method with citrate as com-plexing agent,glycol as dispersant and Ca(NO3)2.4H2O and Co(NO3)2.6H2O as reagents.Block samples were obtained by the com-pacting and sintering processes.Thermoelectric properties of Ca2-xSmxCo2O5,such as resistivity ρ,Seebeck coefficient S and power factor P were studied.Results show that when x=0.10-0.30,in contrast with the standard PDF 37-0668,all the X-ray diffraction peaks are consistent and do not shift.When x=0.45,new peaks of Sm3+ impurities appear.Sm3+ substitution greatly improves the ther-moelectric properties,reduces the resistivity,and enhances the Seebeck coefficient of Ca2Co2O5.The x=0.30 specimen has improved electrical properties.The highest power factor is 1.25 × 10-4 W/(m.K2) at 600 ℃ for sample Ca1.70Sm0.30Co2O5.

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Available abstract

Sm3+-doped thermoelectric powders of Ca2-xSmxCo2O5 were prepared by the citrate sol-gel method with citrate as com-plexing agent,glycol as dispersant and Ca(NO3)2.4H2O and Co(NO3)2.6H2O as reagents.Block samples were obtained by the com-pacting and sintering processes.Thermoelectric properties of Ca2-xSmxCo2O5,such as resistivity ρ,Seebeck coefficient S and power factor P were studied.Results show that when x=0.10-0.30,in contrast with the standard PDF 37-0668,all the X-ray diffraction peaks are consistent and do not shift.When x=0.45,new peaks of Sm3+ impurities appear.Sm3+ substitution greatly improves the ther-moelectric properties,reduces the resistivity,and enhances the Seebeck coefficient of Ca2Co2O5.The x=0.30 specimen has improved electrical properties.The highest power factor is 1.25 × 10-4 W/(m.K2) at 600 ℃ for sample Ca1.70Sm0.30Co2O5.

Key concepts: Seebeck coefficient, Materials science, Electrical resistivity and conductivity, Thermoelectric effect, Sintering, Impurity, Analytical Chemistry (journal), Thermoelectric materials

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