Structural, electrical and magnetic properties of Cob>0.5b>Znb>0.5b>Alb>xb>Feb>2鈭?span style='font-style: italic'>xb>Ob>4b> (x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) prepared via sol-gel route

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• 作者：Sonal Singhal ; ^{sonal1174@gmail.com} ; Rimi Sharma ; Tsering Namgyal ; Sheenu Jauhar ; Santosh Bhukal ; Japinder Kaur
• 关键词：C. Electrical properties ; D. Ferrites ; Saturation magnetization ; Coercivity ; X-ray diffraction
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：May, 2012
• 卷：38
• 期：4
• 页码：2773-2778
• 文件大小：1026 K

摘要

Nanoparticles of Cob>0.5b>Znb>0.5b>Alb>xb>Feb>2鈭?em>xb>Ob>4b> (x = 0, 0.2, 0.4, 0.6, 0.8 and 1.0) were synthesized by sol-gel method and the influence of Al³⁺ doping on the properties of Cob>0.5b>Znb>0.5b>Feb>2b>Ob>4b> was studied. X-ray diffraction studies revealed the formation of single phase spinel type cubical structure having space group Fd-3m. A decreasing trend of the lattice parameter was observed with increasing Al³⁺ concentration due to the smaller ionic radii of Al³⁺ ion as compared to Fe³⁺ ion. TEM was used to characterize the microstructure of the samples and particle size determination, which exhibited the formation of spherical nanoparticles. The particle size was found to be increases up to 鈭?5 nm after annealing the sample at 1000 掳C. Electrical resistivity was found to increase with Al³⁺ doping, attributed to the decrease in the number of Fe²⁺-Fe³⁺ hopping. The activation energy decreased with increasing Al³⁺ ion concentration, indicating the blocking of conduction mechanism between Fe³⁺-Fe²⁺ ions. The value of saturation magnetization decreased, when Fe³⁺ ions were doped with Al³⁺ ions in Cob>0.5b>Znb>0.5b>Feb>2b>Ob>4b>; however, the coercivity values increased with increasing Al³⁺ ion content.