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Gaudefroyite: a mineral with excellent magnetocaloric effect suitable for liquefying hydrogen

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Abstract

Gaudefroyite contains chains of edge-linked MnO6 octahedra on a Kagomé lattice which results in magnetic frustration between the chains and overall spin-liquid behaviour below 9 K. Magnetization and specific heat measurements indicate very large entropy increases for temperatures of 10–30 K on removal of applied magnetic fields as low as 2 T. This is attributed to the degenerate magnetic ground states originating from the frustrated Kagomé lattice. Direct temperature change measurements confirm that the mineral has excellent low-field magnetocaloric properties suitable for refrigeration to produce liquid hydrogen.

Graphical abstract: Gaudefroyite: a mineral with excellent magnetocaloric effect suitable for liquefying hydrogen

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Publication details

The article was received on 04 Aug 2017, accepted on 13 Sep 2017 and first published on 13 Sep 2017


Article type: Communication
DOI: 10.1039/C7TA06883B
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Gaudefroyite: a mineral with excellent magnetocaloric effect suitable for liquefying hydrogen

    R. Li, G. Li and C. Greaves, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C7TA06883B

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