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- Title
Role of Ca<sup>2+</sup> doping on the structure, magnetic, and magnetocaloric properties of La<sub>0.75</sub>Gd<sub>0.05</sub>Sr<sub>0.2−x</sub>Ca<sub>x</sub>MnO<sub>3</sub> (x = 0, 0.05, 0.075, and 0.10) perovskite manganites.
- Authors
Zhang, Weijian; He, Bangrong; Zou, Zhengguang; Xie, Zhuojia; Jiang, Xinyu; Mao, Zheng; Xu, Changji; Feng, Min
- Abstract
In this paper, La0.75Gd0.05Sr0.2-xCaxMnO3 perovskite manganites were synthesized by the sol-gel method, and the effects of Ca2+ (x = 0, 0.05, 0.075, and 0.10) doping on the structural, magnetic, and magnetocaloric properties of the samples were investigated. All the samples exhibited a rhombic structure with R-3c space group symmetry; however, the incorporation of calcium ions leads to an increase in the Mn–O bond length and a reduction in the Mn-O-Mn bond angle, which weakens the double exchange effect and lowers the Curie temperature of the sample. For all the samples, it was demonstrated that the types of ferromagnetic–paramagnetic were second-order magnetic phase transitions. The magnetic entropy changes of the samples were also found to be positively correlated with the amount of Ca2+ doping, indicating that this group of samples is a suitable candidate for room-temperature magnetic refrigeration materials.
- Publication
Journal of Materials Science: Materials in Electronics, 2023, Vol 34, Issue 10, p1
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-023-10311-2