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]; Ti, Ruixia[1]; Lu, Xiaomei[2]; Zhang, Chenyang[3]; Yuan, Long[4]; Xu, Yan[1]; Zhang, Liwei[1]

第一作者：吴花蕊

通讯作者：Huang, Fengzhen

机构：[1] College of Physics and Electronic Engineering, Xinxiang University, Xinxiang, 453003, China; [2] National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing, 210093, China; [3] College of Chemistry and Materials Engineering, Xinxiang University, Xinxiang, 453003, China; [4] Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, College of Physics, Jilin Normal University, Changchun, 130103, China

第一机构：新乡学院物理与电子工程学院

通讯机构：[2]National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing, 210093, China;[4]Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, College of Physics, Jilin Normal University, Changchun, 130103, China

年份：2021

卷号：861

外文期刊名：Journal of Alloys and Compounds

收录：EI(收录号：20204909585558);Scopus(收录号：2-s2.0-85097067343)

语种：英文

外文关键词：Calcium - Iron - Saturation magnetization - Thermoanalysis - Yttrium iron garnet - Calcium compounds

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 M?ssbauer 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 μm. 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 M?ssbauer 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. ? 2020 Elsevier B.V.