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The Investigation of Transport And Thermoelectrical Properties of Rare Earth Sm Doped SrTiO3 System

Author: CaoZhiQun
Tutor: SuiYu
School: Harbin Institute of Technology
Course: Condensed Matter Physics
Keywords: Thermoelectric effect Thermoelectric properties Transport
CLC: TG146.45
Type: Master's thesis
Year: 2010
Downloads: 42
Quote: 1
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Abstract


The thermoelectric material is a power and heat in the direct conversion between the functional material can be widely used for power generation and refrigeration. Oxide thermoelectric materials have excellent structural stability and chemical stability, low cost, easily oxidized, pollution, etc. caused widespread research interest. In this paper, to explore ways to enhance the thermoelectric properties of thermoelectric materials, in-depth analysis of the doping amount the SrTiO 3 transport and thermoelectric properties of the material impact. This thesis attempts by the sol - gel method, the method of high temperature and pressure, the solid state reaction method pre-synthesis of rare earth Sm doping series the sample Sm x Sr-(-x) TiO 3 < / sub>, and finally Although some single-phase samples, but further testing showed that the sample quality requires further improvement. The sm x Sr 1-1.5x TiO , 3 (x = 0,0.02,0.04,0.06,0.08). Samples by conventional solid phase reaction method, and found conditions the 1470 ℃ 5% H2/Ar sintered 6 hours, the solid solubility limit of 8%. The density of the sample test showed that the sample has a high denseness. XRD structure analysis did not find the presence of impurity peaks, and with the increase in the doping amount, there is a slight trend of moving to the high-angle diffraction peak. Redox titration showed a gradual reduction of the oxygen content increasing doped. Found that the rare earth doping can significantly reduce the resistivity of the sample through the sample Low resistivity. For the conduction mechanism of the samples analyzed, found in the low temperature region in line with the thermally activated hopping conduction model, in line with the high temperature zone adiabatic small polaron hopping conduction model. Detailed study the Sm x Sr 1-1.5x TiO 3 series of samples of low-temperature thermal conductivity and thermoelectric power. The study found that the main factors affecting the thermal conductivity of the point defect scattering. The analysis showed that the low-temperature thermoelectric power thermoelectric power of the sample at room temperature, the following approximate to meet the non-degenerate semiconductor Fermi level data model, and by a simple calculation. The rare earth Sm doping to improve the Fermi level, changing the shape of the Fermi surface and band structure, and hence a change in the value of the Seebeck coefficient. Based on the above analysis show that the A bit doped rare earth can effectively reduce the thermal conductivity and resistivity of the material, while the thermopower is not significantly reduced, entire Sm x Sr 1-1.5x TiO 3 thermoelectric properties of the system is further improved.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Non - ferrous metals and their alloys > Rare metals and their alloys > Rare earth metals
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