メカニカルミリング法によるAgl-Ag_2WO_4系銀イオン伝導性材料の合成--その2.ミリングによる非晶質化反応過程

摘要

Vitrification process induced by a ball milling was investigated for silver-ion-conducting materials in the system AgI-Ag_2WO_4. The amorphous materials were obtained over the wide composition range of 30 to 70mol percent AgI content. The silver-ion conductivities of a ball-milled sample showed the maximum at a milling time at which the sample was composed of an amorphous phase and alpha-Ag_2WO_4 crystalline phase. This result suggested that the amorphous phase was containing a large amount of AgI content and the amorphous phase was a high ion conductive phase. The maximum conductivity 4.8X10~2Scm~(-1) at 298 K was observed for the 70AgI center dot 30Ag_2WO_4(mol percent) sample ball-milled for 20 h. This conductivity was higher than that of the completely amorphous sample with the same composition.