期刊
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
卷 26, 期 2, 页码 415-424出版社
SPRINGER
DOI: 10.1007/s10948-012-1749-0
关键词
Hydrothermal; Nanorods; CoFe2O4; Dielectric properties; Scanning electron microscopy
资金
- TWAS, Italy
- Higher Education Commission (HEC) Islamabad, Pakistan
- Pakistan Science Foundation (PSF) [147]
This paper presents a low temperature (130 and 160 A degrees C) synthesis route to prepare the spinel phase CoFe2O4 nanoparticles and nanorods. A one-dimensional (1-D) structure of Co-ferrite was successfully synthesized using Cetyl Trimethyl Ammonium Bromide (CTAB) as a surfactant at temperature 160 A degrees C. Structural, electrical, and magnetic measurements have been performed using X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM), and the Vibrating Sample Magnetometer (VSM). XRD patterns show a pure spinel (fcc) structure, showing a complete phase formation at a low temperature of 160 A degrees C, without any subsequent sintering. Average crystallite sizes have been calculated by Sherrer's and Williamson-Hall methods. As prepared CoFe2O4 nanorods exhibited a uniform shape of diameter 60-80 nm and 600-900 nm in length. The FTIR spectrum for Co-ferrite nanorods shows two intrinsic lattice absorption bands for tetrahedral and octahedral sublattices. DC electrical resistivity of CoFe2O4 nanorods is high up to similar to 10(8) (Omega-cm), as compared to CoFe2O4 nanoparticles (similar to 10(7) Omega-cm) at 373 K. Dielectric parameters were measured using a LCR meter, in the frequency range of 1 kHz to 5 MHz. The real and imaginary part of the dielectric constant (epsilon' and epsilon aEuro(3)) and dielectric loss tangent (tan delta) reduces for CoFe2O4 nanorods in comparison to nanoparticles, and has a value of 13.6 and 0.0416, respectively. Magnetic properties were characterized by VSM under a field of 10 kOe and showed that the 1-D structure reduces the magnetization of nanocrystalline CoFe2O4 from 65 emu/gm to 54 emu/gm.
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