期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 333, 期 -, 页码 46-52出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2012.12.027
关键词
Nanostructure; Sol-gel combustion; X-ray diffraction; Dielectric constant
资金
- Higher Education Commission(HEC) Pakistan [147]
Nanocrystalline Mn-Zn soft ferrites with chemical formula Mn0.5Zn0.5-xCdxFe2O4 (x=0.0-0.35) were synthesized using the sol-gel autocombustion method. The formation of single phase cubic spinel structure was confirmed from X-ray diffraction (XRD) pattern for all samples. The average crystallite size was calculated using Scherrer's formula and it remains within the range 24-50 +/- 2 nm. The structural parameters, lattice constant, XRD density, polaron length, polaron radius, lattice strain and porosity, have been calculated using XRD data. The variation in dielectric constant, dielectric loss tangent, AC conductivity and complex impedance analysis were studied in the frequency range from 20 Hz to 5 MHz at room temperature. The values of dielectric constant and loss tangent were found to be lowest for the concentration x=0.25. The high values of DC electrical resistivity (2.2 x 10(11) Omega cm at 373 K) and activation energies suggests the conduction in Cd2+ doped Mn-Zn ferrite system is due to hopping of polarons. Complex impedance plane plots were used to separate the grain and grain boundary effects in Mn0.5Zn0.5-xCdxFe2O4. Vibrating sample magnetometer measurements carried out at room temperature shows that saturation magnetization and magnetic moment increased with increase in cadmium content up to x=0.25. The addition of Cd improves the magnetic and electrical properties of Mn-Zn ferrites. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据