Improved thermoelectric property of cation-substituted CaMnO3

doi:10.1088/1674-1056/24/9/098101

中国物理B ›› 2015, Vol. 24 ›› Issue (9): 98101-098101.doi: 10.1088/1674-1056/24/9/098101

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Improved thermoelectric property of cation-substituted CaMnO₃

Pradeep Kumar^a, Subhash C. Kashyap^b, Vijay Kumar Sharma^a, H. C. Gupta^b

a Department of Physics, Shyam Lal College, University of Delhi, Shahdara, Delhi, India;
b Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India

收稿日期:2015-01-18 修回日期:2015-04-28 出版日期:2015-09-05 发布日期:2015-09-05

Improved thermoelectric property of cation-substituted CaMnO₃

Pradeep Kumar^a, Subhash C. Kashyap^b, Vijay Kumar Sharma^a, H. C. Gupta^b

a Department of Physics, Shyam Lal College, University of Delhi, Shahdara, Delhi, India;
b Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India

Received:2015-01-18 Revised:2015-04-28 Online:2015-09-05 Published:2015-09-05
Contact: Pradeep Kumar E-mail:sharmapradeep014@gmail.com

摘要/Abstract

摘要： Single-phase pristine and cation-substituted calcium manganite (Ca_1-xBi_xMn_1-yV_yO_3-δ ) polycrystalline samples were synthesized by the solid state reaction technique. Their thermoelectric properties were measured by a set up that was designed and assembled in the laboratory. The Ca_1-xBi_xMn_1-yV_yO_3-δ sample with x = y = 0.04 has shown a power factor (S²σ) of 176 μW/m/K² at 423 K, which is nearly two orders of magnitude higher than that of the pristine sample (2.1 μW/m/K²). The power factor of the substituted oxide remains almost temperature independent as the Seebeck coefficient increases monotonically with temperature, along with the simultaneous decrease in electrical resistivity which is attributed to enhanced electron density due to co-doping of bismuth and vanadium and grain boundary scattering. These cation-substituted calcium manganites can be used as a potential candidate for an n-type leg in a thermoelectric generator (module).

关键词: thermoelectric materials, solid state reaction, Seebeck coefficient, power factor

Abstract: Single-phase pristine and cation-substituted calcium manganite (Ca_1-xBi_xMn_1-yV_yO_3-δ ) polycrystalline samples were synthesized by the solid state reaction technique. Their thermoelectric properties were measured by a set up that was designed and assembled in the laboratory. The Ca_1-xBi_xMn_1-yV_yO_3-δ sample with x = y = 0.04 has shown a power factor (S²σ) of 176 μW/m/K² at 423 K, which is nearly two orders of magnitude higher than that of the pristine sample (2.1 μW/m/K²). The power factor of the substituted oxide remains almost temperature independent as the Seebeck coefficient increases monotonically with temperature, along with the simultaneous decrease in electrical resistivity which is attributed to enhanced electron density due to co-doping of bismuth and vanadium and grain boundary scattering. These cation-substituted calcium manganites can be used as a potential candidate for an n-type leg in a thermoelectric generator (module).

Key words: thermoelectric materials, solid state reaction, Seebeck coefficient, power factor

中图分类号: (Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides))

81.05.Je

72.15.Jf (Thermoelectric and thermomagnetic effects) 72.20.Ee (Mobility edges; hopping transport)

Pradeep Kumar, Subhash C. Kashyap, Vijay Kumar Sharma, H. C. Gupta. Improved thermoelectric property of cation-substituted CaMnO₃[J]. 中国物理B, 2015, 24(9): 98101-098101.

Pradeep Kumar, Subhash C. Kashyap, Vijay Kumar Sharma, H. C. Gupta. Improved thermoelectric property of cation-substituted CaMnO₃[J]. Chin. Phys. B, 2015, 24(9): 98101-098101.

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Improved thermoelectric property of cation-substituted CaMnO₃

Improved thermoelectric property of cation-substituted CaMnO₃

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