高能球磨技术是一种有效的合成非晶质材料、纳米材料的方法,本研究利用高能球磨技术制备了Ag2S含量为80％的非晶质快离子导电材料,研究表明:当研磨时间为12～20h可导致非晶质相的形成.这种非晶质材料具有很高的电导率,其中20h研磨样品的室温电导率最高,为296×100Sm-1.进一步研磨致使部分Ag8SiS6晶体相析出,材料的电导率有所下降.利用直流极化技术对这些样品电子电导率测定结果表明:非晶质样品、(研磨时间长于27h的)复相样品以及Ag8SiS6晶体的银离子迁移率为1.
High-energy ball-milling process is a powerful method for the preparation of amorphous phases, nanocrystalline materials, and so on. In this paper, we applied the high-energy ball-milling process
to the synthesis of superionic conducting amorphous materials with Ag2S content of 80 mol%. Ball milling of 12h to 20h led to the formation of amorphous phases in the composition. The amorphous
samples showed very high ionic conductivities, among which the 20h-ball-milled sample presented the maximum conductivity of 2.96×100Sm-1 at 298 K. Further ball milling resulted in
partial precipitation of Ag8SiS6 crystalline phase, therefore, a decrease in ionic conductivity was observed for the samples ball-milled for longer than 27h. DC polarization measurements suggested
that the ion transport number of the amorphous samples and the ball-milled samples containing some Ag8SiS6 crystalline phase, together with that of the Ag8SiS6 crystal, was practically unity.
参考文献
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