【摘要】 用固相反应法、X射线粉末衍射技术和复平面阻抗谱测量研究了BaF₂-BiF₃系统的相组成和离子电导。$ 在此系统中发现了两种类型的Ba_1-xBi_xF_2+x固溶体:萤石型（0<x≤0.45）和氟铈矿型（0.83≤x≤0.95）以及一个有序相。后者能被指标化为萤石型的超结构rha’(R3或R3,a_s≈0.5(14^1/2)a_F,c_s≈2(3^1/2)a_F)。对两类固溶体的结晶学性能和电性能进行了研究和讨论。 新的氟铈矿型结构的氟离子导体Bi_1-yBa_yF_3-y（0.05≤y≤0.17）（y=1-x）具有较好的电性能。这可能和Bi³⁺离子的高极化性有关。更多还原

【Abstract】 BaF2-BiF3 system has been studied by means of solid state reaction, X-ray powder diffraction technique and complex impedance measurement.We found two kinc’s of Ba1_xBi_xF_2+x solid solution: fluorite-type （0 < x ≤ 0.45） and tysonite-type （0.83≤x≤0.95） as well as an ordered phase which can be described as a new type of fluorite-related superstructure rha’(R3 or R3, a_s（?）0.5 14^1/2af,c_s（?）2 3^1/2af). The crystallographic and electrical properties of the two solid solutions have been investigated and discussed.New F^- ionic conductors Bi_1-yBa_yF_3-y （0.05≤r≤0.17） （y = 1 - x） with tysonite-type structure have good electrical performances. This may be due to the higher polarizability更多还原