采用高温熔融/热处理并结合SPS烧结工艺制备了Yb名义组分为0.6的YbyCo4Sb12/Yb2O3填充方钴矿复合材料,纳米或亚微米Yb2O3颗粒主要分散在方钴矿晶界上.研究了873 K下低氧分压高温处理对样品的热电性能与微结构的影响.热处理后样品的电导率、赛贝克系数、热导率基本保持不变,块体材料内部纳米与亚微米尺度微观结构未发生明显变化,未发现填充方钴矿结构中的Yb元素的“大量逸出”与氧化,材料的高温ZT值保持在1.2左右.TEM观察发现YbyCo4Sb12填充方钴矿晶粒内存在大量的位错,由位错产生的内应力有可能对Yb离子从晶格孔洞的逸出以及Yb离子和O离子的扩散产生阻碍作用,从而抑制了在高温低氧分压下YbyCo4Sb12的内氧化,使得高Yb含量的YbyCo4Sb12/Yb2O3复合材料的高温稳定性比低Yb含量填充方钴矿材料更佳.
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