B-site deficient hexagonal perovskites: Structural stability, ionic order-disorder and electrical properties

• Published in: Progress in solid state chemistry Vol. 74; p. 100459
• Main Authors: Yang, Xiaoyan, Fernández–Carrión, Alberto J., Geng, Xinyue, Kuang, Xiaojun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-06-2024
• Subjects: B-site deficient hexagonal perovskite; Defect structure; Ionic conduction properties; Ionic order-disorder; Microwave dielectric properties; Ionic conduction properties; Defect structure; B-site deficient hexagonal perovskite; Ionic order-disorder; Microwave dielectric properties
• ISSN: 0079-6786; 1873-1643
• DOI: 10.1016/j.progsolidstchem.2024.100459

This review presents an overview on the structures and electrical properties of B-site deficient hexagonal perovskite oxides, which have been receiving increasing attention as key components as dielectric resonators in microwave telecommunications, as well as solid-state oxide ion and proton conductors in solid oxide fuel cells. The structural evolution and stability, order-disorder of cation and anions, and mechanisms underlying the dielectric and ionic conduction behaviors for the B-site deficient hexagonal perovskites are summarized and the roles of the B-site deficiency on the structural stability and option, ion order-disorder and electrical performance are highlighted. This provides useful guidance for design of new hexagonal perovskite oxide materials and structural control to enhance their electrical properties and discover new functionality as dielectric resonators and solid-state ionic conductors.
B-site-deficient hexagonal perovskite oxides exhibit diverse structures and attractive electrical properties due to the introduction of a deficiency in B-site cations. This deficiency is conducive to relieving electrostatic repulsion, adjusting microwave dielectric performance, and promoting oxide ionic transportation. [Display omitted]