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• W1972166338 abstract "We report the significantly improved magnetocaloric properties of sol–gel prepared nanocrystalline samples of LaMnO3 with average particle size ∼200 nm and ∼40 nm in comparison with their bulk counterpart. The samples show negligible hysteresis losses in the ferromagnetic state and exhibit large magnetocaloric effect associated with their paramagnetic to ferromagnetic (PM–FM) transition. In comparison with bulk LaMnO3, both refrigerant capacity (RC) and relative cooling power (RCP) are greatly enhanced (up to 65%) in the nanocrystalline samples. This is attributed to the presence of superparamagnetic (SPM) nanoclusters near and above the PM–FM transition for the nanoparticles. For a field change of 5 T, the sample with average particle size ∼40 nm shows RCP as large as ∼369 J/kg, which is about 2.6 times larger than that reported for Gd nanoparticles (mean size ∼15 nm) and even comparable to that of bulk Gd (∼410 J/kg). Our studies reveal that the reduction of particle size to the nanoscale can be an effective way of increasing RC and RCP of manganite materials." @default.
• W1972166338 created "2016-06-24" @default.
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• W1972166338 date "2012-12-01" @default.
• W1972166338 modified "2023-10-10" @default.
• W1972166338 title "Magnetocaloric properties of nanocrystalline LaMnO3: Enhancement of refrigerant capacity and relative cooling power" @default.
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• W1972166338 doi "https://doi.org/10.1016/j.jallcom.2012.08.001" @default.
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