Author/Authors :
Wang، نويسنده , , H.C. and Wang، نويسنده , , Nicky C.L. and Su، نويسنده , , Patrick W.B. and Liu، نويسنده , , J. and Zhao، نويسنده , , Y. and Peng، نويسنده , , H. and Zhang، نويسنده , , J.L. and Zhao، نويسنده , , M.L. and Li، نويسنده , , J.C. and Yin، نويسنده , , N. and Mei، نويسنده , , L.M.، نويسنده ,
Abstract :
Ceramic samples of La0.1Sr0.9−xDyxTiO3 (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 mΩ cm at room temperature is obtained in La0.1Sr0.8Dy0.1TiO3, and with a relatively lower thermal conductivity of 2.5 W/m K at 1075 K. The maximum figure of merit reaches ∼0.36 at 1045 K for La0.1Sr0.83Dy0.07TiO3, which is the largest value among n-type oxide thermoelectric ceramics.
Keywords :
A. Ceramics , B. Electrical properties , D. Thermal conductivity , A. Oxides
