Synthesis and Thermal Properties of Nanoscale Skutterudite via Cross-Coprecipitation

摘要

CoSb_3 with nanoscale was synthesized by Cross-coprecipitation. A precursor consisting of antimony oxide and cobalt hydrate was prepared by the reaction of CoCl_2, SbCl_3 and both precipitators at room temperature. The precursor was reduced in thermal treatment under hydrogen atmosphere whereby the CoSb_3 was thus obtained. The parameters especially reducing temperature and atmosphere (content of H_2) influence the constituent phases and particle size of product significantly. The single phase CoSb_3 with the average grain size of 60～70 nm was obtained after reduced at 723 K for 2 h with pure H_2. Nanoscale CoSb_3 powder was used as starting materials, and bulk CoSb_3 compound was prepared by spark plasma sintering (SPS). The effect of grains size on thermal conductivity was investigated.