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首页> 外文期刊>Crystallography reports >Ionic conductivity of crystallization products of Ba1-x Yb (x) F2+x melts (x=0.1, 0.2, 0.25)
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Ionic conductivity of crystallization products of Ba1-x Yb (x) F2+x melts (x=0.1, 0.2, 0.25)

机译：Ba1-x Yb（x）F2 + x熔体的结晶产物的离子电导率（x = 0.1，0.2，0.25）

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摘要

The ionic conductivity sigma of the crystallization products of Ba1 - x Yb (x) F2 + x melts with 10, 20 and 25 mol % YbF3 has been studied. A Ba0.9Yb0.1F2.1 sample is a solid solution with the CaF2 structure type, sp. gr. Fmm. A Ba0.8Yb0.2F2.2 sample contains two cubic forms with sp. gr. Fmm and Pmm. The sigma values for Ba0.9Yb0.1F2.1 and Ba0.8Yb0.2F2.2 coincide and are equal to similar to 3 x 10(-5) S/cm at 500 K. A Ba0.75Yb0.25F2.25 sample is heterogeneous, despite its monolithic nature and transparency. A greater part of its volume has a cubic lattice with sp. gr. Pmm, while the smaller part is a phase crystallizing in the orthorhombic system. A change of composition from x = 0.2 to 0.25 leads to a change in the symmetry group and type of the cluster defects in the Ba1 - x Yb (x) F2 + x phase. The sp. gr. Fmm is replaced by the sp. gr. Pmm, and octahedralaEuro'cubic {Ba8Yb6F69} clusters are transformed into "inverse" octahedralaEuro'cubic {Yb8Ba6F71} clusters. These changes in the defect structure lead to an increase in conductivity by a factor of about 100. The fluorine-ionic conductivity of Ba0.75Yb0.25F2.25 is 2.5 x 10(-3) S/cm at 500 K. This value exceeds the conductivity of Ba0.69La0.31F2.31 crystal by a factor of 15 (Ba0.69La0.31F2.31 has the best conducting properties among the fluorite phases of the Ba1 - x R (x) F2 + x family, for which sigma was found to increase with a decrease in the atomic number of rare earth element (REE)).
机译：研究了Ba1-x Yb（x）F2 + x与10、20和25 mol％YbF3熔体的结晶产物的离子电导率sigma。 Ba0.9Yb0.1F2.1样品是具有CaF2结构类型sp。的固溶体。 gr。嗯Ba0.8Yb0.2F2.2样品包含两个立方晶，其sp。 gr。 Fmm和Pmm。 Ba0.9Yb0.1F2.1和Ba0.8Yb0.2F2.2的sigma值重合，并且在500 K时等于3 x 10（-5）S / cm.Ba0.75Yb0.25F2.25样品为尽管具有整体性和透明性，但它们是异构的。其体积的大部分具有带sp的立方晶格。 gr。 Pmm，而较小的部分是在正交晶系中结晶的相。组成从x = 0.2更改为0.25会导致对称组和Ba1-x Yb（x）F2 + x相中的簇缺陷类型改变。的sp。 gr。 Fmm替换为sp。 gr。 Pmm和八面体Euro'cubic {Ba8Yb6F69}簇被转换为“逆”八面体Euro'cubic {Yb8Ba6F71}簇。缺陷结构的这些变化导致电导率增加了大约100倍。Ba0.75Yb0.25F2.25的氟离子电导率在500 K时为2.5 x 10（-3）S / cm。 Ba0.69La0.31F2.31晶体的电导率是15倍（Ba0.69La0.31F2.31晶体在Ba1-x R（x）F2 + x族的萤石相中具有最佳的导电性能发现随着稀土元素（REE）原子数的减少而增加。

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