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Structural, Dielectric, and Magnetic Properties of Lead Zirconate Titanate–Cobalt Ferrite Magnetoelectric Composites
Russian Journal of Inorganic Chemistry ( IF 1.8 ) Pub Date : 2023-03-21 , DOI: 10.1134/s0036023622601258
M. Ahabboud , N. Gouitaa , F. Z. Ahjyaje , T. Lamcharfi , F. Abdi , L. H. Omar

Abstract

In this work, the magnetoelectric composites (1 – x)PbZr0.52Ti0.48O3xCoFe2O4 ((1 – x)PZT–xCFO) have been synthesized using the combination of sol-gel (for PZT ceramic) and the solid-state (for CFO material) methods. X-ray powder diffraction results and Rietveld refinement have shown that the PZT compound crystallizes in two tetragonal and rhombohedral structures with P4mm and R3m space groups, respectively, while the CFO material has shown a spinel cubic structure with Fd3m space group. The (1 – x)PZT–xCFO composites, for x = 0.10 to 0.50, have been fitted and matched very well to the phases corresponding to PZT and CFO materials. The effect of sintering temperature on the structural and dielectric properties of these composites has been also studied (for x = 0.20). It has been found that the phase is stable for 900°C for 4 h while for 1000 and 1100°C we obtain many secondary phases. On the other hand, the pellet sintered at 900°C shows a low dielectric permittivity value and high relaxation behavior. The scanning electron micrographs (SEM) reveal multigrain agglomerations for all the samples and the grain size is maximal (about 2 µm) for x = 0.10 of CFO content and minimal (about 0.7 µm) for pure CFO. The dielectric properties of the composite samples have been also investigated as a function of temperature and showed one phase transition at 410°C for PZT ceramic. This phase transition has shifted to the lower temperature and present a relaxation phenomenon with the increase of CFO content. The dielectric permittivity decreases with the increase of CFO rate related to the CFO ceramic which has a low dielectric permittivity value. The magnetic properties of these magnetoelectric (ME) composites have been also studied by measuring the magnetization as a function of temperature. The obtained results show one maximum of around 427°C related to the phase transition temperature of CFO. In addition, the magnetization value is found to increase when CFO content increases indicating an intrinsic ME coupling.



中文翻译:

锆钛酸铅-钴铁氧体磁电复合材料的结构、介电和磁性

摘要

在这项工作中,磁电复合材料 (1 – x )PbZr 0.52 Ti 0.48 O 3x CoFe 2 O 4 ((1 – x )PZT– x CFO) 已使用溶胶-凝胶(用于 PZT 陶瓷)的组合合成和固态(对于 CFO 材料)方法。X-ray粉末衍射结果和Rietveld精修表明PZT化合物结晶为四方和菱面体结构,分别具有P 4 mmR 3 m空间群,而CFO材料呈现尖晶石立方结构,Fd 3m空间群。(1 – x )PZT– x CFO 复合材料,对于x = 0.10 至 0.50,已经与对应于 PZT 和 CFO 材料的相位进行了很好的拟合和匹配。还研究了烧结温度对这些复合材料的结构和介电性能的影响(对于x = 0.20)。已经发现该相在 900°C 下稳定 4 小时,而在 1000 和 1100°C 下我们获得许多第二相。另一方面,在 900°C 下烧结的颗粒显示出低介电常数值和高弛豫行为。扫描电子显微照片 (SEM) 揭示了所有样品的多晶粒团聚,并且晶粒尺寸最大(约 2 µm)x = 0.10 的 CFO 含量和纯 CFO 的最小值(约 0.7 µm)。复合样品的介电特性也作为温度的函数进行了研究,并显示出 PZT 陶瓷在 410°C 时的一个相变。随着CFO含量的增加,这种相变已经转移到较低的温度并呈现出松弛现象。介电常数随着CFO率的增加而降低,这与具有低介电常数值的CFO陶瓷有关。这些磁电 (ME) 复合材料的磁性也已通过测量磁化强度作为温度的函数进行了研究。获得的结果显示与 CFO 的相变温度相关的最大值约为 427°C。此外,

更新日期:2023-03-22
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