The samples with smaller grain sides were obtained in our experiment , and the properties are corresponding with that of those samples prepared by melting method mentioned previously . several approaches can be proposed for further increasing the thermoelectric properties . preparation of the material with different compositional deviations availably controlled from stoichiometry is one of the ways to change the carrier concentration , and hence to optimize the value of power factor 该方法获取的块体样品的片状颗粒的粒度远小于熔炼法制备的样品，样品的性能也与熔炼法相当，如果能有效控制样品的化学计量比，提高生成物的纯度将会更大程度的提高材料的热电性能。
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