Co_(1-x)Ni_xSb_3材料的制备及其热电性能

Preparation and Thermoelectric Properties of Co_(1-x)Ni_xSb_3

采用溶剂热合成再热处理方法制备了Co_(1-x)Ni_xSb_3(x=0,0.1)粉末。经X射线衍射(XRD)、透射电镜(TEM)分析表明制得的粉末为纳米粉末。粉末经冷压成型后无压烧结得块体试样。扫描电镜(SEM)观察其显微结构表明试样较致密、且晶粒细小。测试了试样从室温至750K的电导率和Seebeck系数,结果表明Ni掺杂使CoSb_3的电导率显著提高,在整个测温范围内其功率因子均比不掺Ni的高。

Co1-xNixSb3 （x=0,0.1）nanopowders were synthesized by solvothermal process followed by heat-treatment. Co1-xNixSb3 （x=0,0.1） nanopowders were characterized by X-ray diffraction （XRD） and transmission electron microscope （TEM）. The nanosized powders synthesized were cold pressed into pellet then pressureless sintered at 700 ℃for 5 h in Ar. Scanning electron microscopy （SEM） observations of the sintered samples reveal that the samples are reasonably densified and that the grain size is in the range of-500 nm to 2 μm. The electrical conductivity and Seebeck coefficient of Co1-x NixSb3 （x=0,0.1） sintered samples were measured form room temperature to 750 K. The results indicate that doping Ni into CoSb3 results in an increase of electrical conductivity and power factor in the whole temperature range measured. The highest power factor is -5 × 10^-4 W/mK2 at 625 K.