Abstract

Synthesis methods, thermodynamic and functional properties of compounds based on bismuth niobates doped with rare-earth elements (REEs) are presented. These compounds are promising materials for fuel cells, ceramic oxygen generators, electrocatalysis, etc. As show the data generalized, most compounds have a cubic structure of the δ-form of bismuth oxide, which has the highest ionic conductivity among solid-state ionic conductors. The compounds have high lattice enthalpy and are therefore promising high-energy compounds. The review summarizes studies on the basic thermodynamic characteristics of bismuth niobates doped with rare earth elements. The change in standard enthalpies of formation, lattice enthalpies, and heat capacity when replacing one rare earth element with another is analyzed. It is shown that as the radius of rare earth elements decreases, the standard enthalpies of formation increases and lattice enthalpies increases. The change in ionic conductivity with changes in temperature and rare earth element content has been studied. It has been shown that with increasing temperature and REE content, conductivity increases.

中文翻译：

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稀土元素掺杂铌酸铋化合物的合成、热力学性质和离子电导率（综述）

 抽象的

介绍了基于掺杂稀土元素（REE）的铌酸铋化合物的合成方法、热力学和功能特性。这些化合物是燃料电池、陶瓷制氧机、电催化等领域有前景的材料。综合数据显示，大多数化合物具有δ型氧化铋的立方结构，其在固态离子导体中具有最高的离子电导率。该化合物具有高晶格焓，因此是有前途的高能化合物。综述了稀土元素掺杂铌酸铋基本热力学特性的研究进展。分析了用一种稀土元素替代另一种稀土元素时标准生成函、晶格函和热容的变化。结果表明，随着稀土元素半径的减小，标准生成焓增大，晶格焓增大。研究了离子电导率随温度和稀土元素含量变化的变化。已经表明，随着温度和稀土元素含量的增加，电导率增加。