Role of Ca2+ doping on the structure, magnetic, and magnetocaloric properties of La0.75Gd0.05Sr0.2-xCaxMnO3 (x=0, 0.05, 0.075, and 0.10) perovskite manganites

被引：4
|
作者：
Zhang, Weijian [1 ]
He, Bangrong [1 ]
Zou, Zhengguang [1 ,2 ]
Xie, Zhuojia [1 ]
Jiang, Xinyu [1 ]
Mao, Zheng [1 ]
Xu, Changji [1 ]
Feng, Min [1 ]
机构：
[1] Guilin Univ Technol, Coll Mat Sci & Engn, Guilin 541004, Peoples R China
[2] Guilin Univ Technol, Collaborat Innovat Ctr Explorat Hidden Nonferrous, Guilin 541004, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | 2023年 / 34卷 / 10期
基金：
中国国家自然科学基金;
关键词：
CRITICAL-BEHAVIOR; ENTROPY CHANGES; FIELD;
D O I：
10.1007/s10854-023-10311-2
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
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.
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页数：13
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