Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK.
Chem Commun (Camb). 2019 Feb 14;55(15):2127-2137. doi: 10.1039/c8cc09534e.
Various structural families have been reported to support oxide ion conductivity; among these, perovskite conductors have received particular attention. The perovskite structure is generally composed of a framework of corner-sharing octahedral units. When the octahedral units share their faces, hexagonal perovskites are formed. Mixed combinations of corner-sharing and face-sharing octahedral units can give rise to a variety of hexagonal perovskite derivatives. However, the ionic conducting properties of these materials have not been well explored. In this feature article, we review the conducting properties of the most significant hexagonal perovskite derivatives, with special focus on Ba3MM'O8.5. Ba3MM'O8.5 is the first hexagonal perovskite derivative to exhibit substantial oxide ion conductivity, and here we outline the structural features that are key for the oxide ion conduction within this system. The results demonstrate that further investigation of hexagonal perovskite derivatives could open up new directions in the design of oxide ion conductors.
已经报道了各种结构家族来支持氧离子导电性；其中，钙钛矿导体受到了特别关注。钙钛矿结构通常由共用角的八面体单元的骨架组成。当八面体单元共享它们的面时，形成六方钙钛矿。共用角和共用面的八面体单元的混合组合可以产生各种六方钙钛矿衍生物。然而，这些材料的离子导电性能尚未得到很好的探索。在这篇专题文章中，我们回顾了最显著的六方钙钛矿衍生物的导电性能，特别关注 Ba3MM'O8.5。Ba3MM'O8.5 是第一个表现出大量氧离子导电性的六方钙钛矿衍生物，我们在这里概述了对于该系统中氧离子传导至关重要的结构特征。结果表明，对六方钙钛矿衍生物的进一步研究可能为设计氧离子导体开辟新的方向。
