Difference in magnetic properties and magnetocaloric effect of FeRh0.98Al0.02 alloy with different sample sizes
Source abstract
Abstract
Abstract Magnetic and magnetocaloric properties of the polycrystalline FeRh0.98Al0.02 alloy have been investigated as function of its physical state. A flake FeRh0.98Al0.02 sample undergoes an antiferromagnetic (AFM)-ferromagnetic (FM) phase transition around 275 K during heating and displays a 20 K thermal hysteresis upon the following cooling with an applied field of 5 kOe. However, for a solid chunk sample, the transition temperature is around 308 K on heating and the hysteresis is 16 K. The maximum magnetic entropy change (ΔSM) is 3.1 and 2.7 J/kg K for μ0ΔH = 30 kOe and the refrigerant capacity (RC) is 120 and 185 J/kg for the flake and chunk samples, respectively. The temperature of the ΔSM maximum for the flake samples changes for different values of ΔH, which is characteristic for a first-order transition. On the other hand, the temperature remains almost constant for the chunk sample.
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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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