Elucidating the origin of the magnetic behaviour of cathode material K1.33Mn8O16
Cryptomelane is an abundant Mn-based mineral which we recently demonstrated is a promising material for Zn-ion batteries, exhibiting a highly reversible transition with charge/discharge cycling and a high capacity of more than ~300 mA h g-1 in the potential window of 1.0 to 1.8 V. Further, magnetic characterization of the material using DC/AC susceptibility indicates a material rich with competing phenomena at low temperatures, with two clear transitions observed. Curie-Weiss fitting indicating antiferromagnetic correlations. Heat capacity shows additional transitions, at 24 K, 42 K, 49 K, and 54 K, and low temperature XRD indicates these are not due to structural changes. This EASY proposal requests two magnetic neutron measurements, one at 60 K (above any magnetic transitions) and one at 5 K, to search for magnetic Bragg peaks which could provide indication of the magnetic ground state of this material. We further ask that a measurement could be conducted at 30 K if time allows, though we accept this may not be possible and the 5 K and 60 K measurements are the priority.
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Liam A. V. Nagle-Cocco and SUARD Emmanuelle. (2021). Elucidating the origin of the magnetic behaviour of cathode material K1.33Mn8O16. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-893
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