Effect of Sintering Temperature on Structural and Magnetic Properties of Ni<sub>0.55</sub>Zn<sub>0.45</sub>Fe<sub>2</sub>O<sub>4</sub>Ferrites

作     者：Robiul Islam Md Obaidur Rahman M. Abdul Hakim Dilip Kumar Saha Saiduzzaman Saiduzzaman Saroaut Noor Md Al-Mamun 

作者机构：Department of Physics Khulna University of Engineering & Technology Khulna Bangladesh Materials Science Division Atomic Energy Centre Dhaka Bangladesh The Department of Physics Jahangirnagar University Dhaka Bangladesh 

出 版 物：《Materials Sciences and Applications》 (材料科学与应用期刊（英文）)

年 卷 期：2012年第3卷第5期

页      面：326-331页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

主　　题：Nanoparticle Sintering Temperature Curie Temperature Microstructure Grain Size 

摘      要：The effect of frequency and sintering temperature on initial permeability of Ni0.55Zn0.45Fe2O4 ferrites have been studied by using an impedance analyzer. The samples were prepared by conventional double sintering ceramic technique using oxide nanoparticles of grain size 30 - 50 nm. Single phase spinal structure has been confirmed for the prepared samples by X-ray diffraction. As the sintering temperatures increase from 1160℃ to 1300℃, the permeability gradually increases. The increase of permeability is ascribed to the increase of density and grain size. Grain size is expected to grow with the increase of sintering temperature. Ferrites with large average grain size posses higher initial permeability. The Curie temperatures determined from temperature dependence of permeability of the samples sintered at different temperatures are found to be Tc = (321 ± 1)℃ and independent of sintering temperature. At Ts = 1300℃, Tc is found to increase substantially which can be explained by the fact that Zn has evaporated from the surface layer.