Study on the effect of Pb partial substitution for Te on the thermoelectric properties of La 3 Te 4-x Pb x materials
作者： H L Gao , T J Zhu , H Wang , Z F Ren , X B Zhao
DOI: 10.1088/0022-3727/45/18/185303
关键词: Crystal structure 、 Phase (matter) 、 Crystallography 、 Atmospheric temperature range 、 Materials science 、 Seebeck coefficient 、 Thermoelectric effect 、 Thermal conductivity 、 Electrical resistivity and conductivity 、 Analytical chemistry 、 Impurity
摘要: The effect of Pb in La3Te4?xPbx on the thermoelectric properties temperature range 300?1100?K was studied samples synthesized by melting, ball milling and hot-pressing method. crystallize Th3P4structure. A small amount substitution for Te La3Te4 reduced electrical conductivity, but impurity phase introduced more significantly enhanced conductivity. conductivity La3Te3.6Pb0.4 sample reached 2.06???105?S?m?1 at room temperature. expansion crystal lattice confirmed from x-ray diffraction patterns slight reduction all verify fact that substitutes a site when x is small. Seebeck coefficient increases linearly with samples. While thermal varies slightly temperature, approaches minimum value high temperatures. For La3Te3.7Pb0.3, power factor 1.4???10?3?W?m?1?K?2 1100?K achieved 1.86?W?m?1?K?1, giving maximum figure-of-merit ZT???0.8 1100?K.
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