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以Zn(OH)2和In2O3为原料,用放电等离子烧结(SPS)技术制备了层状结构的(ZnO)mIn2O3(m=5,7,9)织构热电材料。通过XRD、SEM以及ZEM表征样品的物相、显微组织和电输运性能,分析了m值和烧结温度的影响机制。结果表明,(ZnO)mIn2O3(m=5,7,9)块体材料在平行于压力方向沿(00l)择优取向,呈层状结构特征。固定烧结温度为1323K时,(ZnO)7In2O3样品在773K取得最大功率因子1.88×10-4W·m-1K-2。优化(ZnO)9In2O3样品的烧结温度,发现降低烧结温度增加了Seebeck系数,1223K烧结时在773K取得最大功率因子2.2×10-4W·m-1K-2。
Layered (ZnO) mIn2O3 (m = 5,7,9) textured thermoelectric materials were prepared by spark plasma sintering (SPS) using Zn (OH) 2 and In2O3 as raw materials. The phase, microstructure and electrical transport properties of the samples were characterized by XRD, SEM and ZEM. The influence mechanism of m value and sintering temperature was analyzed. The results show that the (ZnO) mIn2O3 (m = 5, 7, 9) bulk materials have a preferred orientation along (001) parallel to the pressure and have a layered structure. When the sintering temperature was 1323K, the maximum power factor of 1.88 × 10-4W · m-1K-2 was obtained at 773K for (ZnO) 7In2O3 sample. The sintering temperature of (ZnO) 9In2O3 sample was optimized. It was found that decreasing the sintering temperature increased the Seebeck coefficient, and the maximum power factor of 2.2 × 10-4W · m-1K-2 was obtained at 773K at 1223K sintering.