Comparative study of NiFe_{2鈭?span style='font-style: italic'>x}Al_xO₄ ferrite nanoparticles synthesized by chemical co-precipitation and sol-gel combustion techniques

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• 作者：I.H. Gul ; ^{iftikhar_qau@yahoo.com} ; Erum Pervaiz
• 关键词：B. Dielectric properties ; C. X-ray diffraction
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：June, 2012
• 卷：47
• 期：6
• 页码：1353-1361
• 文件大小：1622 K

摘要

A series of aluminum substituted Ni-ferrite nanoparticles have been synthesized by chemical co-precipitation and sol-gel techniques. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscope (AFM), Fourier transform infrared spectroscopy (FTIR), DC electrical resistivity and dielectric properties. Analysis of the X-ray diffraction pattern of all the samples confirmed the formation of spinel structure. The crystallite sizes remain within the range 25-41 卤 3 nm. FTIR measurements show two fundamental absorption bands, assigned to the vibration of tetrahedral and octahedral sites. DC electrical resistivity increases from 6.60 脳 10⁷ to 6.9 脳 10¹⁰ 惟 cm as the Al³⁺ concentration increases from 0.00 to 0.50. The dielectric constant and loss tangent decreases with increasing Al³⁺ concentration from 22 to 14, 0.354 to 0.27 respectively at 5 MHz for all the samples. Impedance measurements as a function of frequency (1 kHz-5 MHz) at room temperature further helped in analyzing the electrical properties of the prepared samples.