Abstract
The magnetic entropy change and other relevant property parameters were calculated by the simplified method proposed by Mahmoud A. Hamad (referred to as the MAH method) and the conventional method, respectively, using the experimental data of magnetization versus magnetic field and temperature of polycrystalline La0.6Sr0.2Ba0.2MnO3. By comparing and analyzing the different results from the two methods, the intrinsic problems involved with the MAH method were disclosed, and a new simplified method to precisely evaluate the magnetic caloric properties of polycrystalline magnetic materials has been proposed, which is based on the fact that the magnetization of a polycrystalline magnetic material varies as a function of both applied magnetic field and temperature and, moreover, the magnetic field dependence of (∂ M/ ∂ T) can be approximately described by a two-segmented linear function over the whole field range. Compared to the conventional method, this new simplified method needs much fewer experimental data but provides good evaluations of property parameters for a polycrystalline magnetic caloric material.
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The authors would like to gratefully acknowledge the funds by the Priority Academic Development Program of Jiangsu Higher Education Institutions, P. R. China, Program for Changjiang Scholars and Innovative Research Teams in Universities (PCSIRT) of China, IRT1146, and the Program of Research Innovation for University Graduate Students of Jiangsu Province (No. CXZZ11_0331), and the fund by the Practice Innovation Program (2014) for University Graduate Students of Jiangsu, China, SJLX 0327.
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Yanfeng, H., Yanwei, Z., Chuanming, L. et al. A New Simplified Method to Evaluate the Property Parameters of Polycrystalline Magnetic Caloric Materials. J Supercond Nov Magn 28, 2567–2573 (2015). https://doi.org/10.1007/s10948-015-3075-9
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DOI: https://doi.org/10.1007/s10948-015-3075-9