Microwave assisted combustion synthesis of CdFe₂O₄: Magnetic and electrical properties

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• 作者：V. Vasanthi^a ; A. Shanmugavani^a ; C. Sanjeeviraja^b ; R. Kalai Selvan^a ; ^{selvankram@buc.edu.in}
• 关键词：Cadmium ferrite ; Microwave-assisted combustion synthesis ; Reaction mechanism ; Structural ; Magnetic and electric property
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：July, 2012
• 卷：324
• 期：13
• 页码：2100-2107
• 文件大小：1494 K

摘要

CdFe₂O₄ particles were synthesized by the microwave assisted combustion method using two different fuels鈥攇lycine and urea. Microwave heating provides higher chemical yield within a minute. The synthesized particles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), ac impedance spectroscopy, vibrating sample magnetometry (VSM) and electron spin resonance (ESR) methods. XRD analysis shows the cubic structure of CdFe₂O₄. The high and low frequency absorption bands of CdFe₂O₄ were found using FTIR analysis. Spherical morphology was revealed from the SEM images. ESR and VSM measurements reveal the antiferromagnetic behavior of CdFe₂O₄. The electrical conductivities of CdFe₂O₄ synthesized using glycine and urea are 6.5脳10^鈭? S cm^鈭? and 4.7脳10^鈭?  S cm^鈭? respectively at 240 ^oC. At elevated temperatures an occurrence of increase in conductivity was observed, which indicates the semiconducting behavior of CdFe₂O₄. The dielectric spectral analysis reveals that dielectric constant of CdFe₂O₄ decreases with frequency and increases with temperature.