文献类型：期刊文献

英文题名：Effect of Ca dopant on magnetic and magnetodielectric properties of Y3Fe5O12

作者：Wu, Huarui[1];Huang, Fengzhen[2,3];Ti, Ruixia[1];Lu, Xiaomei[2,3];Zhang, Chenyang[4];Yuan, Long[5];Xu, Yan[1];Zhang, Liwei[1]

第一作者：吴花蕊

通讯作者：Huang, FZ[1];Huang, FZ[2];Yuan, L[3]

机构：[1]Xinxiang Univ, Coll Phys & Elect Engn, Xinxiang 453003, Henan, Peoples R China;[2]Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China;[3]Nanjing Univ, Phys Sch, Nanjing 210093, Peoples R China;[4]Xinxiang Univ, Coll Chem & Mat Engn, Xinxiang 453003, Henan, Peoples R China;[5]Jilin Normal Univ, Coll Phys, Minist Educ, Key Lab Funct Mat Phys & Chem, Changchun 130103, Peoples R China

第一机构：新乡学院物理与电子工程学院

通讯机构：[1]corresponding author), Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China;[2]corresponding author), Nanjing Univ, Phys Sch, Nanjing 210093, Peoples R China;[3]corresponding author), Jilin Normal Univ, Coll Phys, Minist Educ, Key Lab Funct Mat Phys & Chem, Changchun 130103, Peoples R China.

年份：2021

卷号：861

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000619199300057)】；

基金：This work was supported by National Natural Science Foundation of China (Grant Nos. 51802275, 61671235), Science and Technology Research Project of Henan Province (Grant No. 202102210001), the Science Fund of Educational Department of Henan Province of China (Grant No.15A140032), Henan science and technology public relations project (Grant No.192102310467), the Key scientific project of Higher education of Henan province (Grant No. 20B140012), the Ninth Group of Key Disciplines in Henan Province (Grant No. 2018119), and the Dr. Scientific research start project of Xinxiang University.

语种：英文

外文关键词：YIG ceramics; Magnetism; Magnetodielectric effect; Mossbauer

摘要：A series of Ca-doped yttrium iron garnet ceramics (Y3-xCaxFe5O12 (x = 0, 0.05, 0.1, 0.15, 0.2)) were prepared by the solid state method. The structure, morphology, valence fluctuation, thermal analysis, magnetization, magnetodielectric and Mdssbauer spectrum of Y3-xCaxFe5O12 ceramics were systematically studied. All of the samples crystalized as single phase of garnet structure with the grain sizes of 2-3 mu m. The temperature dependent percentage weight loss and heat flow were investigated by thermogravimetric (TG) and differential scanning caborimetry (DSC). The structure of Y3-xCaxFe5O12 ceramics was studied by XRD, Raman and Infrared (IR) spectra. The results indicated that Ca2+ substitution leads to lattice expansion and presence of Ca-O octahedron, which causes the concentration of Fe2+ decrease and Fe4+ increase. As a result, the saturation magnetization first increases and then decreases with the increase of Ca concentration. A six lines asymmetry of magnetic components were observed in Mossbauer spectrum, which was fitted by two hyperfine magnetic sextets corresponding to tetrahedral and octahedral sites, respectively. With the increase of Ca concentration, the intrinsic magnetodielectric (MD) effect disappears completely due to the dramatic decrease of Fe2+-Fe3+ dipoles. Fe3+-Fe4+ dipoles do not contribute to the MD properties of Y3-xCaxFe5O12 ceramics due to the lack of the defects such as electrons or holes being used as media. (C) 2020 Elsevier B.V. All rights reserved.