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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Microstructure, Real Structure and Crystal Defects

KFM 17.5: Vortrag

Freitag, 20. März 2020, 11:10–11:30, TOE 317

Hidden Diversity of Vacancy Orderings in Prussian Blue Analogues — •Arkadiy Simonov^1,2, Hanna B. Boström², and Andrew L. Goodwin² — ¹Multifunctional Ferroic Materials, Materials Department, ETH Zürich — ²Inorganic chemistry laboratory, University of Oxford

Prussian blue analogues (PBAs) are a broad and important family of microporous inorganic solids, famous for their gas storage, metal-ion immobilisation, proton conduction, and stimuli-dependent magnetic, electronic and optical properties, The family also includes widely investigated hexacyanoferrate/hexacyanomanganate (HCF/HCM) battery materials. Central to the various physical properties of PBAs is the ability to transport mass reversibly, a process made possible by structural vacancies. In the absence of a better model the distribution of such vacancies was assumed random.

In this talk I would like to present the latest results of analysis of the diffuse scattering from PBA single crystals which show that vacancy show surprisingly strong local ordering. Moreover, the distribution of these vacancies is influenced by crystallisation conditions. Our results establish a clear foundation for correlated defect engineering in PBAs as a means of controlling storage capacity, anisotropy, and transport efficiency.