Enhancement of thermoelectric figure of merit by doping Dy in La{sub 0.1}Sr{sub 0.9}TiO{sub 3} ceramic
- School of Physics, State Key Laboratory of Crystal Materials, Shandong University, No. 5, Hongjialou Street, Jinan 250100 (China)
Ceramic samples of La{sub 0.1}Sr{sub 0.9-x}Dy{sub x}TiO{sub 3} (x = 0.01, 0.03, 0.07, 0.10) have been prepared by the solid-state reaction method. Characterization from the powder X-ray diffraction indicates that their crystal structure changes from cubic to tetragonal phase. Their electrical and thermal transport properties are measured in the temperature range of 300-1100 K. n-Type thermoelectric is obtained with large Seebeck coefficient. The figure of merit is markedly improved, due to relatively lower electrical resistivity and thermal conductivity by Dy doping effect. A much lower electrical resistivity of 0.8 m{Omega} cm at room temperature is obtained in La{sub 0.1}Sr{sub 0.8}Dy{sub 0.1}TiO{sub 3}, and with a relatively lower thermal conductivity of 2.5 W/m K at 1075 K. The maximum figure of merit reaches {approx}0.36 at 1045 K for La{sub 0.1}Sr{sub 0.83}Dy{sub 0.07}TiO{sub 3}, which is the largest value among n-type oxide thermoelectric ceramics.
- OSTI ID:
- 22207328
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 45; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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