Searching beyond Gd for magnetocaloric frameworks: magnetic properties and interactions of the Ln(HCO2)3 series

Paul J. Saines; Joseph A.M. Paddison; Peter M.M. Thygesen; Matthew G. Tucker

doi:10.1039/c5mh00113g

Searching beyond Gd for magnetocaloric frameworks: magnetic properties and interactions of the Ln(HCO₂)₃ series

Paul J. Saines, Joseph A.M. Paddison, Peter M.M. Thygesen, Matthew G. Tucker

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Abstract

This study probes the magnetic properties and interactions of the Ln(HCO₂)₃ (Ln = Tb³⁺-Er³⁺) frameworks. We show that the magnetocaloric effect of Tb(HCO₂)₃ is significantly higher above 4 K in moderate magnetic fields compared to the promising Gd(HCO₂)₃. While the peak performance of Tb(HCO₂)₃ is lower than Gd(HCO₂)₃, we also find that the Gd-rich members of the solid solution Gd_1-xTb_x(HCO₂)₃ blend the advantages of both end-members. Using neutron diffraction experiments, Tb(HCO₂)₃ is found to be antiferromagnetic below 1.7 K with ferromagnetic face-sharing chains and antiferromagnetic coupling between them. Analysis of magnetic diffuse scattering of the paramagnetic phase indicates that ferromagnetic coupling is retained, and it is likely that this plays a role in improving its magnetocaloric performance in low fields.

Original language	English
Pages (from-to)	528-535
Number of pages	8
Journal	Materials Horizons
Volume	2
Issue number	5
DOIs	https://doi.org/10.1039/c5mh00113g
State	Published - Sep 1 2015
Externally published	Yes

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title = "Searching beyond Gd for magnetocaloric frameworks: magnetic properties and interactions of the Ln(HCO2)3 series",

abstract = "This study probes the magnetic properties and interactions of the Ln(HCO2)3 (Ln = Tb3+-Er3+) frameworks. We show that the magnetocaloric effect of Tb(HCO2)3 is significantly higher above 4 K in moderate magnetic fields compared to the promising Gd(HCO2)3. While the peak performance of Tb(HCO2)3 is lower than Gd(HCO2)3, we also find that the Gd-rich members of the solid solution Gd1-xTbx(HCO2)3 blend the advantages of both end-members. Using neutron diffraction experiments, Tb(HCO2)3 is found to be antiferromagnetic below 1.7 K with ferromagnetic face-sharing chains and antiferromagnetic coupling between them. Analysis of magnetic diffuse scattering of the paramagnetic phase indicates that ferromagnetic coupling is retained, and it is likely that this plays a role in improving its magnetocaloric performance in low fields.",

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AU - Tucker, Matthew G.

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AB - This study probes the magnetic properties and interactions of the Ln(HCO2)3 (Ln = Tb3+-Er3+) frameworks. We show that the magnetocaloric effect of Tb(HCO2)3 is significantly higher above 4 K in moderate magnetic fields compared to the promising Gd(HCO2)3. While the peak performance of Tb(HCO2)3 is lower than Gd(HCO2)3, we also find that the Gd-rich members of the solid solution Gd1-xTbx(HCO2)3 blend the advantages of both end-members. Using neutron diffraction experiments, Tb(HCO2)3 is found to be antiferromagnetic below 1.7 K with ferromagnetic face-sharing chains and antiferromagnetic coupling between them. Analysis of magnetic diffuse scattering of the paramagnetic phase indicates that ferromagnetic coupling is retained, and it is likely that this plays a role in improving its magnetocaloric performance in low fields.

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Searching beyond Gd for magnetocaloric frameworks: magnetic properties and interactions of the Ln(HCO₂)₃ series

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