Protonic solid electrolytes: thermal stability and conductivity of ammonium/hydronium β″-alumina
Protonic solid electrolytes: thermal stability and conductivity of ammonium/hydronium β″-alumina
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质子固体电解质：铵/水合氢β″-氧化铝的热稳定性和电导率
DOI：
10.1016/0022-4596(89)90251-x
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
G. Farrington
中科院分区：
文献类型：
--
作者：
J. Denuzzio;G. Farrington
摘要铵/水合氢β-氧化铝（[NH 4 H3 O] 1.67Mg0.67Al10.33O17）是一种非常稳定的质子离子固体电解质。例如，它在200° C时的电导率约为10− 2（Ω cm）− 1。本文用化学分析、TGA、DSC和复阻抗分析等方法研究了铵/水合氢β ″-氧化铝的组成、稳定性和离子导电性。结果表明，铵/水合氢β ″-氧化铝具有（NH 4）1.0（H3 O）0.67 Mg 0.67 Al 10.33 O 17的优先组成，这对应于结构中铵离子、水合氢离子和空位的有序排列，尽管目前只是假设。铵/水合氢β ″-氧化铝在低于350° C时以离散和可逆的反应分解，产生水和氨。（NH 4）1.0（H3 O）0.67Mg0.67Al10.33O17单晶体的电导率在200 ℃以下服从阿氏关系|MoC的活化能为0.26 eV（σ= 10− 3（25° C时Ω cm− 1））。
Abstract Ammonium/hydronium β-alumina,[NH 4 H 3 O] 1.67 Mg 0.67 Al 10.33 O 17, is an unusually stable and conductive solid electrolyte for protonic ions. Its conductivity at 200° C, for example, reaches about 10− 2 (Ω cm)− 1. This paper describes an investigation of the composition, stability, and ionic conductivity of ammonium/hydronium β ″-alumina by means of chemical analysis, TGA, DSC, and complex impedance analysis. The results demonstrate that ammonium/hydronium β ″-alumina has a preferential composition of (NH 4) 1.0 (H 3 O) 0.67 Mg 0.67 Al 10.33 O 17, which corresponds to a rather elegant, albeit only hypothetical at this time, ordered arrangement of ammonium ions, hydronium ions, and vacancies in the structure. Ammonium/hydronium β ″-alumina decomposes below 350° C in discrete and reversible reactions that yield water and ammonia. The conductivity of single crystals of (NH 4) 1.0 (H 3 O) 0.67 Mg 0.67 Al 10.33 O 17 obeys an Arrhenius relationship below 200| MoC with an activation energy of 0.26 eV (σ= 10− 3 (Ω cm− 1 at 25° C).