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首页> 外文期刊>Russian journal of electrochemistry >High-temperature proton conductors with structure-disordered oxygen sublattice
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High-temperature proton conductors with structure-disordered oxygen sublattice

机译：具有结构紊乱的氧亚晶格的高温质子导体

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Data on the thermogravimetry, spectroscopy, and electrical charge transfer as functions of T, aH(2)O, and aO(2) for niobates and tantalates of alkali-earth metals with structure disordering of the oxygen sublattice, which can show high-temperature proton conduction, are summarized. It is shown that in the solid solution series with decreasing x (that is, with the increasing of the oxygen vacancies concentration) the proton conductivity increase, which is caused by the increasing of both the concentration of proton defects formed in the structure (in compliance with the formula Sr6 - 2x M (2 + 2x) (+5) O-10(OH)(2-6x) and their mobility. The proton transfer dominates for the compositions with x < 0.15 at temperatures below 550A degrees C. In the solid solutions (Ba1-y Ca (y) )(6)Nb2O11 (0.23 a parts per thousand currency sign y a parts per thousand currency sign 0.47) characterized by equal concentration of oxygen vacancies, with the increasing of barium content (correspondingly, with the increasing of the lattice parameter) the oxygen-ion conductivity (at aH(2)O = 3 x 10(-5)) grows monotonically, which is caused by the decreasing of the oxygen atom migration energy and increasing of their mobility. In this series, the proton conductivity (at aH(2)O = 2 x 10(-2)) increased. It was shown, by using IR-spectroscopy and the H-1 NMR method, that the protons exist in the complex oxide structure mainly as energy-wise nonequivalent OH- groups: isolated, closely set, and paired, whose quantitative ratios are determined by the coordination preference of the B-sublattice elements.
机译：碱土金属铌酸盐和钽酸盐的热重分析，光谱学和电荷转移与T，aH（2）O和aO（2）的函数关系，其氧亚晶格的结构无序，可显示高温质子传导，概述。结果表明，在固溶体系列中，随着x的减小（即，随着氧空位浓度的增加），质子电导率增加，这是由于在结构中形成的两个质子缺陷浓度（顺应性）的增加所致。分子式为Sr6-2x M（2 + 2x）（+5）O-10（OH）（2-6x）及其迁移率，质子转移在温度低于550A的情况下对于x <0.15的组合物而言占主导。固溶体（Ba1-y Ca（y））（6）Nb2O11（0.23 a每千货币符号ya y每千货币符号0.47），其特征在于氧空位浓度相同，且钡含量增加（相应地，随着晶格参数的增加，氧离子电导率（在aH（2）O = 3 x 10（-5）处）单调增长，这是由于氧原子迁移能的降低和其迁移率的提高所致。这个系列的质子传导率（在aH（2）O = 2 x 10（-2）时）增加。通过红外光谱和H-1 NMR方法表明，质子存在于复合氧化物结构中，主要是作为能量方向上不等价的OH-基团：分离，紧密设置和配对，其定量比由B子格元素的协调偏好。

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