Investigation of structural, magnetic, electrical and optical properties of chromium substituted cobalt ferrites (CoCr_xFe_{2鈭?/sub>xO4, 0 猢?#xa0;x 猢?#xa0;1) synthesized using sol gel auto combustion meth}

详细信息	查看全文 | 推荐本文 |

• 作者：Sonal Singhal^a ; ^{sonal1174@gmail.com} ; Sheenu Jauhar^a ; Jagdish Singh^b ; Kailash Chandra^c ; Sandeep Bansal^d
• 关键词：A. Nanostructures ; A. Magnetic materials ; C. X-ray diffraction ; D. Electrical properties
• 刊名：Journal of Molecular Structure
• 出版年：2012
• 期刊代码：62_00222860
• 类别：ch
• 出版时间：28 March, 2012
• 卷：1012
• 期：Complete
• 页码：182-188
• 文件大小：788 K

摘要

The structural, magnetic, electrical and optical properties of chromium substituted cobalt ferrites (CoCr_xFe_{2鈭?/sub>xO4, x = 0.2, 0.4, 0.6, 0.8 and 1.0), have been investigated and on the basis of the saturation magnetization values, the cation distribution in the ferrite samples has been proposed. It is suggested that both Co²⁺ ions as well as Cr³⁺ ions seek to the octahedral sites of the ferrite sub-lattice. However, a small amount of Co²⁺ ions are also incorporated in the tetrahedral sites of the ferrite sub-lattice. This causes a decrease in the saturation magnetization (Ms) values with increasing Cr³⁺ concentration. The increase in Cr³⁺ ion composition in the ferrite sample decreases the value of saturation magnetization from 77 emu/g to 13 emu/g, indicative of the fact that the lesser magnetic Cr³⁺ ions substitute Fe³⁺ ions in the octahedral sub-lattice of the ferrites. A significant decrease in the saturation magnetization is observed in CoCrFeO4, attributing to the weakening of the A-B interaction as iron enters into the A site. The magnetic moments calculated from the proposed cation distribution (using Neel鈥檚 two sub-lattice model) are in conformity with those obtained from Ms values. The effect of annealing temperature on structural, magnetic, electrical and optical properties has also been investigated.}