Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 670, Issue -, Pages 123-127Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.02.014
Keywords
Magnetocaloric effect; Magnetic materials; Magnetic refrigeration; Nitrogen addition
Categories
Funding
- BASF New Business
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Amongst magnetic materials that exhibit a giant magnetocaloric effect near room temperature, the (Mn,Fe)(2)(P,Si) system is one of the most promising candidates for magnetic refrigeration. Although the (Mn,Fe)(2)(P,Si) materials hold many advantages, controlling the magnetic entropy change Delta S-m, the adiabatic temperature change Delta T-ad, the thermal hysteresis and the mechanical stability across the ferromagnetic transition requires a delicate tuning of the composition. This work investigates the addition of nitrogen, as an interstitial or substitutional element, as a new parameter to tune the properties of (Mn,Fe)(2)(P,Si) materials. We found that the nitrogen addition results in a decrease of the Curie temperature, consistent with the observed increase in the c/a ratio. The introduction of nitrogen in (Mn,Fe)(2)(P,Si) materials also results in a strong enhancement of the mechanical stability. (C) 2016 Elsevier B.V. All rights reserved.
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