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XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  Magnetocaloric Properties of Fe-Ni-Cr Nanoparticles fo Active Cooling

BaC6

Edgar Fernando A. Aylon

Tuesday, November 08, 2016

Low cost, earth abundant, rare earth free magnetocaloric nanoparticles have attracted an enormous amount of attention for green, energy efficient, active near room temperature thermal management. Hence, we investigated the magnetocaloric properties of transition metal based (Fe70Ni30)100−xCrx(x = 1, 3, 5, 6 and 7) nanoparticles. The influence of Cr additions on the Curie temperature (Tc) was studied. Only 5% of Cr can reduce the Tc from ~438 K to 258 K. These alloys exhibit broad entropy v/s temperature curves, which is useful to enhance relative cooling power (RCP). For a field change of 5T,the RCP for (Fe70Ni30)99Cr1 nanoparticles was found to be 548 J-kg−1. Tunable Tc in broad range, good RCP, low cost, high corrosion resistance and earth abundance make these nanoparticles suitable for low-grade waste heat recovery as well as near room temperature active cooling applications.