Improving magnetocaloric cycle performance through thermal hysteresis control in (Mn, Fe, Ni)2(P, Si, B) intermetallic compounds
Source abstract
Abstract
The efficiency of a magnetic cooling system relies on the stability of the magnetocaloric materials. This study investigates the correlation between the cyclic behavior and thermal hysteresis (Δ Thys) of (Mn,Fe) 2(P,Si) intermetallic compounds to identify optimal coolants. Doping with boron (B) weakens the magnetoelastic coupling in these alloys, reducing both magnetic entropy change (Δ SM) and Δ Thys as B content increases. A dedicated measurement system was developed to directly measure the adiabatic temperature change (Δ Tad) during repeated magnetic field changes. Cyclic Δ Tad measurements revealed that samples with high Δ Thys exhibit a drastic decrease in Δ Tad after the first cycle, whereas samples with low Δ Thys display remarkably stable cycled Δ Tad, even with a relatively low Δ SM value. As a result, despite exhibiting lower Δ SM values, these compounds show improved cyclic characteristics due to the weakening magnetoelastic coupling, leading to a reduction in thermal hysteresis with increasing B content. This phenomenon can be attributed to the weakening of first-order magnetic transition (less abrupt change in magnetization) during the cyclic operation.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Shape Memory Alloy Transformations · Thermal Expansion and Ionic Conductivity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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