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Superparamagnetic cobalt-substituted copper zinc ferrialuminate: synthesis, morphological, magnetic and dielectric properties investigation
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2019-08-20 , DOI: 10.1007/s10971-019-05106-z
Dilip L. Navgare , V. B. Kawade , U. B. Tumberphale , Santosh S. Jadhav , R. S. Mane , Shyam K. Gore

Abstract

The cobalt-substituted copper zinc ferrite (Cu0.3Zn0.7−xCoxFeAlO4, CZC ferrite) was chemically synthesized by the sol−gel methodology. The phase identification, crystal structure change confirmation, morphology analysis, and magnetic evolution of samples have been studied. The X-ray diffraction and vibrating sample magnetometer (VSM) were used for structural and magnetic studies of the prepared CZC ferrite samples. The cation distribution carried out from X-ray analysis confirms the occupancy of Fe3+, Zn2+ and Cu2+ on tetrahedral sites and Fe3+, Cu2+, Al3+ and Co2+ on octahedral sites in the crystal lattice. The spherical-shaped nanoparticles of 22−32 nm were observed from TEM images, and the nanocrystallinity of particles was confirmed from HRTEM. Hysteresis curves of the CZC demonstrate modifications in coercivity, magnetization and magnetic remanence with Co2+ ions doping in CZC systems. All the samples show soft magnetic behavior. For x = 0.3, lower values of Hc and Mr indicate super-paramagnetic nature. The dielectric behavior of CZC system was analyzed with frequency variation of real and imaginary portion of dielectric constant. The effects of multi-elementals like Cu, Zn, Co, and Al on ferrite are studied in this paper. The transition of ferrite from ferrimagnetic to superparamagnetic is observed in this study.



中文翻译:

超顺磁性钴取代铜铁酸铝锌:合成,形态,磁性和介电性能研究

摘要

钴取代的铜锌铁氧体(铜0.30.7〜XX FeAlO 4,CZC铁素体)通过溶胶-凝胶方法是化学合成的。研究了样品的相识别,晶体结构变化确认,形态分析和磁演化。X射线衍射和振动样品磁力计(VSM)用于制备的CZC铁氧体样品的结构和磁性研究。通过X射线分析得出的阳离子分布证实了Fe 3+,Zn 2+和Cu 2+在四面体位点以及Fe 3+,Cu 2 +,Al 3+和Co的占有率晶格中八面体位点为2+。从TEM图像中观察到22-32nm的球形纳米颗粒,并且从HRTEM证实了颗粒的纳米结晶度。CZC的磁滞曲线表明,在CZC系统中掺杂Co 2+离子可改善矫顽力,磁化强度和剩磁。所有样品均显示出软磁行为。对于x  = 0.3,较低的H cM r值表示超顺磁性。利用介电常数实部和虚部的频率变化分析了CZC系统的介电性能。本文研究了Cu,Zn,Co和Al等多种元素对铁素体的影响。在这项研究中观察到铁素体从亚铁磁性转变为超顺磁性。

更新日期:2020-03-16
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