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 8 2017
Accepted
13 9 2017
First published
13 9 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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