Electrical conduction in fluoride glasses and mixed halide glasses.

氟化物玻璃和其他卤化物玻璃因其红外光学材料而备受关注。本文测量了<ZrF_4> - <BaF_2>和<AlF_3> - <BaF_2>体系氟化玻璃的电导率，并对其导电机理进行了探讨。采用微皮安计和LCR计测量电导率。卤化物玻璃中的电载流子是卤素阴离子，而氧化物玻璃中的电载流子是单价阳离子。氟化玻璃的电导率随温度升高而升高，符合传导活化能恒定的阿伦尼乌斯方程。研究发现，在形成网络的组分相同的情况下，电导率几乎不随组分的变化而变化，但随着形成网络的组分的变化而变化明显。Baldwin等报道的<BeF_2> -CsF玻璃的电导率远低于现有的玻璃。<F^- b>离子的浓度在所有这些玻璃中几乎是相同的。结论：只有非桥接氟阴离子才能在电场作用下移动并作为电载体，而桥接氟阴离子不能作为电载体。

Fluoride glasses and other halide glasses have attracted much attention because of infrared optical materials. In the present study, the electrical conductivities of some fluoride glasses based on <ZrF_4> - <BaF_2> and <AlF_3> - <BaF_2> systems were measured and conduction mechanisms were discussed. The conductivities were measured using the micro picoammeter and LCR meter. The electrical carriers in halide glasses are halogen anions, being contrast to oxide glasses in which electrical carriers are monovalent cations. The electrical conductivitiy of each fluoride glass was found to increase with temperature, obeying the Arrhenius equation with constant activation energies for conduction. It was found that the electrical conductivity hardly changes with composition so far as the network forming componenets are same, but changes extraordinarily with network forming components. The electrical conductivities of <BeF_2> -CsF glasses reported by Baldwin et al are much lower than those of the present glasses. The concentration of <F^-> ions is almost same for all these glasses. It was concluded that only non-bridging fluorine anion can move under electrical field and act as electrical carrier, but bridging fluorine anion can not be electrical carrier.