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采用固相反应+放电等离子体两步法成功地制备了TiFeSb及Mn掺杂的(Ti0.75Mn0.25)FeSb两种P型Half-Heusler热电材料,并对这两种新型热电材料体系的X射线衍射谱进行了计算模拟和试验研究,同时对其组织结构和热电性能进行了表征。试验结果表明,合成材料的X射线衍射试验谱可以与模拟计算谱很好的吻合;50℃时,TiFeSb的ZT值为0.011,而(Ti0.75Mn0.25)FeSb体系因Mn掺杂后电阻率大幅度下降,Seebeck系数变化不大,热导率下降了1.2 W·m-1·K-1,使得最终的功率因子较TiFeSb体系提高了3.5倍,ZT值提高了4.3倍。
Two types of P-type Half-Heusler P-type TiFeSb and Mn-doped (Ti0.75Mn0.25) FeSb thermoelectric materials were successfully prepared by solid-state reaction + discharge plasma method. Ray diffraction spectra of the simulation and experimental study, at the same time its structure and thermoelectric properties were characterized. The experimental results show that the X-ray diffraction spectrum of synthetic materials can be well fitted with the calculated spectra. The ZT value of TiFeSb is 0.011 at 50 ℃, while the resistivity of (Ti0.75Mn0.25) The Seebeck coefficient changes little and the thermal conductivity decreases by 1.2 W · m-1 · K-1, making the final power factor increased by 3.5 times and the ZT value by 4.3 times compared with TiFeSb system.