Structure, magnetism, critical behavior and magnetocaloric effects of La0.66Ca0.33MnO3 porous nanospheres tuned by a solvothermal method with PVP addition
Source abstract
Abstract
La 0.66Ca 0.33MnO 3 porous nanospheres were synthesized by a solvothermal method. The diameter, pore size and density of La 0.66Ca 0.33MnO 3 porous nanospheres were controlled by changing the concentration of PVP (Ployvinylpyrrolidone, K29–32) addition. The effects of structure on the magnetic phase transition, magnetocaloric effects and critical index of the samples were investigated. The results indicated that La 0.66Ca 0.33MnO 3 exhibited a second order paramagnetic (PM)-ferromagnetic (FM) transition. The shorter Mn-O bond length and larger Mn-O-Mn angle of the La 0.66Ca 0.33MnO 3 porous nanospheres enhanced the double exchange, leading to an increase in Curie temperature. The critical parameters β, γ and δ of the samples were confirmed using the modified arrott plot (MAP). The critical parameters of La 0.66Ca 0.33MnO 3 nanospheres without PVP addition were similar to the Mean field model. While the La 0.66Ca 0.33MnO 3 porous nanospheres with PVP addition were judged to favor the Ising model using RS parallelism. The maximum magnetic entropy changes were calculated from the isothermal magnetization curve and observed for -ΔS M(5 T) NPS-0.75 g was 3.994 J/kg.K. NPS-1 g with the highest PVP addition had a large -ΔS M half-height wide temperature interval, obtaining the maximum relative cooling capacity (RCP) of 247.364 J/kg (5 T). These obtained values showed that the La 0.66Ca 0.33MnO 3 porous nanospheres could be as promising candidates for magnetic refrigeration near room temperature.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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