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Fine control of Curie temperature of magnetocaloric alloys La(Fe,Co,Si)13 using electrolytic hydriding

DOI: 10.1016/j.scriptamat.2019.08.017 DOI Help

Authors: Liya Guo (Imperial College London) , Edmund Lovell (Imperial College London) , Qiwei Tang (Imperial College London) , David C. Boldrin (Imperial College London) , Chiu C. Tang (Diamond Light Source) , Sarah J. Day (Diamond Light Source) , Lesley F. Cohen (Imperial College London) , Mary P. Ryan (Imperial College London)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Scripta Materialia , VOL 175 , PAGES 33 - 37

State: Published (Approved)
Published: October 2019
Diamond Proposal Number(s): 19792

Abstract: This work demonstrates precision control of hydrogen content in La(Fe,Co,Si)13Hδ for the development of environmentally friendly magnetocaloric-based cooling technologies, using an electrolytic hydriding technique. We show the Curie temperature, a critical parameter which directly governs the temperature window of effective cooling, can be varied easily and reproducibly in 1 K steps within the range 274 K to 402 K. Importantly, both partially (up to 10%) and fully hydrided compositions retain favorable entropy change values comparable to that of the base composition. Crucially, we show in these second-order phase transition compounds, partial hydriding is stable and not susceptible against phase separation.

Journal Keywords: Magnetocaloric effect; Intermetallics; Electrolytic hydriding; Synchrotron radiation

Subject Areas: Materials, Physics

Instruments: I11-High Resolution Powder Diffraction