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本文研究了非晶态离子导体Li_2B_2O_4的离子电导率与温度的关系,特别着重于晶化前期的离子迁移特性。当温度低于T_K(≈310℃)时,离子电导率遵从Arrhenius关系。当高于晶化温度(≈411℃)时,以晶态中的离子迁移为主。在T_kT_p时,出现了少量微晶,但晶化量小于5%,由于非晶母体与微晶之间的界面效应使得离子导电性显著增强。可以通过室温淬火,把晶化前期非晶态的状态保持到室温,从而有可能制备出离子电导率高于纯非晶态的材料。
In this paper, the relationship between ionic conductivity and temperature of amorphous Li_2B_2O_4 ion conductor has been studied, with particular emphasis on the ion mobility characteristics of the pre-crystallization phase. When the temperature is below T_K (≈310 ℃), the ionic conductivity follows the Arrhenius relationship. When higher than the crystallization temperature (≈411 ℃), the main ion mobility in the crystalline state. At T_k T_p, The amount of crystallization is less than 5%, and the ionic conductivity is significantly enhanced due to the interfacial effect between the amorphous matrix and the crystallites. It can be quenched at room temperature to maintain the pre-crystallization state to room temperature, thereby making it possible to prepare a material having an ion conductivity higher than that of the pure amorphous state.