Issue 13, 2018

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

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

Article information

Article type
Communication
Submitted
04 Aug 2017
Accepted
13 Sep 2017
First published
13 Sep 2017
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2018,6, 5260-5264

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

R. Li, G. Li and C. Greaves, J. Mater. Chem. A, 2018, 6, 5260 DOI: 10.1039/C7TA06883B

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