Wednesday, 4 October 11:00am – 12:00pm

This seminar will be delivered in Chemistry Lecture Theatre 4

Speaker: Alex Brown, University of Sydney

Host: Professor Christopher Ling

Title: Crystal-chemistry of layered and vacancy ordered perovskite derivatives

Abstract: The perovskite structure has become ubiquitous in materials science, due to its extremely broad chemical and structural versatility. Hexagonal and layered perovskites are less well studied compared to corner sharing variants which can give rise to distinct structural motifs including face-sharing units which can have important implications for chemical bonding and properties[1]. The introduction of ordered oxygen vacancies is another way that new structures can be derived from typical stochiometric perovskites. Perovskite related structures therefore present a promising playground to discover new materials with intriguing properties. Many of the compounds studied in this work were synthesised on the basis of inherent oxygen vacancies, making them candidates as potential solid-state proton and oxide ion conductors [2,3]. Solid-state proton and oxide ion conductors have diverse potential applications as fuel-cell membranes, electrodes, batteries, and sensors. This presentation will discuss several new layered perovskite structures exploring the relationships among chemistry, structure and properties. The materials were characterised using a combination of high-resolution diffraction, spectroscopy, and ab initio calculations.

[1] Nguyen, L.T. and Cava, R.J. Chem. Rev.  121, 5, 2935–2965 (2021)

[2] Fop, S. et al., J. Am. Chem. Soc., 138, 51, 16764–16769 (2016)

[3] Auckett, J.E. et al., Chem. Mater.  31, 5, 1715–1719 (2019)