Abstract
In this paper, the GdCrO3 polycrystalline samples with different particle sizes were prepared by the sol–gel method and the structure, vacancy defects, magnetocaloric property, dielectric property were investigated in detail. The results indicate that the lattice constant and vacancy defects can be affected greatly by the particle size. With the particle sizes increases, the magnetic entropy becomes larger at first, and then it decreases accompanying particle size becomes larger than 395 nm. That is, the d = 395 nm sample presents the best magnetocaloric property and the maximum magnetic entropy (− ΔSM) and the refrigerant capacity (RCP) at T = 3 K and H = 3 T condition is 33.41 J·kg−1 K−1 and 552.4 J kg−1. The temperature and magnetic field dependent permittivity also confirm the magneto-dielectric effect of the prepared GdCrO3. As the particle size increases, the coupling coefficient enhanced continuously. Especially for the d = 485 nm sample, a small field of 1 T could cause the dielectric constant increases by about 10%. This work suggests that increasing the particle size is an effective method for improving the magnetocaloric and magnetoelectric properties of GdCrO3.
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Acknowledgements
We gratefully acknowledge the financial support of National Natural Science Fund of China (No. 61571403), Research Project of Department of Science and Technology in Henan Province (Nos. 192102210157, 202102210006, 202102210477) and the Key Research Project of Colleges and Universities of Henan Province (20A140029).
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HH was responsible for drafting the manuscript, as well as the acquisition, analysis, and interpretation of data. YS contributed to the conception of the study. GG and YW helped perform the analysis with constructive discussions. CS and JZ helped to perform the experiments and collect data. All authors read and approved the final manuscript.
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Hu, H., Su, Y., Shi, C. et al. Influence of particle size on the magnetocaloric and dielectric properties of GdCrO3. J Mater Sci: Mater Electron 33, 12113–12125 (2022). https://doi.org/10.1007/s10854-022-08171-3
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DOI: https://doi.org/10.1007/s10854-022-08171-3