Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materials

Sacha Fop; Kirstie S McCombie; Eve J Wildman; Janet M S Skakle; Abbie C. Mclaughlin

doi:10.1039/c8cc09534e

Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materials

Sacha Fop^* (Corresponding Author), Kirstie S McCombie, Eve J Wildman, Janet M S Skakle, Abbie C. Mclaughlin^* (Corresponding Author)

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	2127-2137
Number of pages	11
Journal	Chemical Communications
Volume	55
Issue number	15
Early online date	17 Jan 2019
DOIs	https://doi.org/10.1039/c8cc09534e
Publication status	Published - 2019

Bibliographical note

This research was supported by the Leverhulme Trust and the University of Aberdeen. We also acknowledge the UK Science and Technology Facilities Council (STFC) for provision of beamtime at ISIS and the ILL

Keywords

CRYSTAL-STRUCTURE
PHASE-TRANSITIONS
CATIONIC VACANCIES
TRANSPORT
COORDINATION
TEMPERATURE
MECHANISMS
MIGRATION
HYDRATION
STACKING

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title = "Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materials",

abstract = "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.",

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note = "This research was supported by the Leverhulme Trust and the University of Aberdeen. We also acknowledge the UK Science and Technology Facilities Council (STFC) for provision of beamtime at ISIS and the ILL",

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AU - Wildman, Eve J

AU - Skakle, Janet M S

AU - Mclaughlin, Abbie C.

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AB - 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.

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Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materials

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Keywords

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