Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materialsElectronic supplementary information (ESI) available. See 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, hexa...
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| Format | Journal Article |
| Language | English |
| Published |
14.02.2019
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| 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 Ba
3
MM′O
8.5
. Ba
3
MM′O
8.5
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.
A structural rearrangement is observed in Ba
3
MM′O
8.5
hexagonal perovskites above 300 °C, which enhances the oxide ionic conductivity. |
|---|---|
| AbstractList | 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 Ba
3
MM′O
8.5
. Ba
3
MM′O
8.5
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.
A structural rearrangement is observed in Ba
3
MM′O
8.5
hexagonal perovskites above 300 °C, which enhances the oxide ionic conductivity. |
| Author | Wildman, Eve J Fop, Sacha Mclaughlin, Abbie C McCombie, Kirstie S Skakle, Janet M. S |
| AuthorAffiliation | Department of Chemistry University of Aberdeen Meston Walk |
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| Notes | Sacha Fop obtained his BSc and MSc in Chemistry from the University of Perugia, Italy. In 2017, he received his PhD from the University of Aberdeen under the supervision of Professor Abbie C. Mclaughlin. After a period spent as a research associate working on materials for lithium ion batteries at the University of Southampton, he is now a postdoctoral research fellow at the University of Aberdeen. His current research interests include the synthesis and characterisation of solid-state ionic conductors and hexagonal perovskite materials using powder diffraction and electrical analysis techniques. He dedicates special emphasis to exploring the link between crystal structure and physical properties. Abbie Mclaughlin received her BSc from the University of Durham (1997) and PhD from the University of Cambridge (2002), supervised by Professor Paul Attfield. In 2003, she was awarded the Royal Society of Edinburgh SEELLD Personal Fellowship. She followed this up with a Leverhulme Trust Early Career Fellowship from 2003-2006. She is currently a Personal Chair in Inorganic Chemistry at the University of Aberdeen. Her expertise lies in the synthesis and study of transition metal oxide perovskites and oxyarsenides with fascinating electrical, optical and magnetic properties. In particular her research focuses on important correlations between the crystal structure and properties. She has published over sixty papers on the study of transition metal oxides using structural (powder diffraction) and physical (magnetic, diffuse reflectance and conductivity) measurements. Kirstie McCombie received her BSc from the University of Aberdeen in 2015. She is currently undertaking her PhD at the University of Aberdeen where she is manipulating the oxide ion conductivity of hexagonal perovskite derivatives by performing targeted chemical substitutions. She also has a keen interest in determining the crystal structures of the novel phases she synthesises. Eve Wildman received her degrees from the University of Aberdeen (BSc in Chemistry, 2008 and PhD in solid state chemistry, under the supervision of Professor Jan Skakle, in 2013). From 2013-2018 she worked as a postdoctoral researcher in the Mclaughlin group where she led projects in the synthesis and properties of magnetic oxyarsenides and novel proton conductors. She has so far published fifteen papers and will take up a position as lecturer at the University of Aberdeen in January 2019. Professor Jan Skakle received her BSc in Physics from the University of Aberdeen, followed by a research MSc in Crystallography and PhD in Solid State Chemistry (1995) supervised by Professor Tony West. She was appointed to a lectureship in Aberdeen in Condensed Matter Physics in 1997 and was promoted to Personal Chair in 2013. Her research focus is on the Solid State and her specialist area is the application of diffraction methods to a wide variety of materials problems, with over 200 papers in this area. She is particularly interested in structure-property relationships in novel oxide materials, especially in electroceramics and bioceramics. In the latter, she has also been part of a University spin-out company and holds 7 patents. Electronic supplementary information (ESI) available. See DOI 10.1039/c8cc09534e |
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| Title | Hexagonal perovskite derivatives: a new direction in the design of oxide ion conducting materialsElectronic supplementary information (ESI) available. See DOI: 10.1039/c8cc09534e |
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