Reduced hysteresis in La_0.7Ce_0.3Fe_11.5Si_1.5 hydrides by grain size reduction.

ABSTRACT: Magnetic cooling technology, based on the magnetocaloric effect (MCE), offers an energy-efficient and eco-friendly alternative to conventional gas compression, but is often hindered by large magnetic hysteresis, which limits cyclic performance. In this study, we show that the hysteresis of La_0.7Ce_0.3(Fe,Si)₁₃ hydrides - a promising material for room-temperature refrigeration - can be significantly reduced by refining the microstructure of the precursor alloy. Substituting Ce for La in (La_0.7Ce_0.3)(Fe,Si)₁₃H_x increases hysteresis losses from 12.3 J/kg to 34 J/kg. However, preparing the precursor alloy using the melt-spinning technique can almost eliminate this hysteresis. Lorentz transmission electron microscopy (Lorentz-TEM)

SUBMITTER: Prusty MM 

PROVIDER: S-EPMC12312218 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature