Structural, microstructure and magnetic properties of superparamagnetic MnxMg1?XFe2O4 powders synthesized by sol–gel auto-comb

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• 作者：M. M. Rashad ; M. G. Fayed ; T. M. Sami…
• 刊名：Journal of Materials Science: Materials in Electronics
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：26
• 期：2
• 页码：1259-1267
• 全文大小：1,036 KB
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• 作者单位：M. M. Rashad (1)
  M. G. Fayed (2)
  T. M. Sami (2)
  E. E. El-Shereafy (3)
  
  1. Central Metallurgical Research and Development Institute, P.O. Box 87, Helwan, Cairo, Egypt
  2. Tabbin Institute for Metallurgical Studies, Cairo, Egypt
  3. Chemistry Department, El-Menoufia University, Shebin El-Kom, Egypt
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1573-482X

文摘

Ultrafine manganese magnesium ferrites Mn x Mg1?/strong> x Fe2O4 powders (x?=?0.2, 0.4, 0.5, 0.6, 0.8) have been synthesized using a sol–gel auto-combustion method using tartaric acid as a fuel for the first time. The effect of synthesis conditions such as annealing temperature, Mn2+ ion molar ratio and type of carboxylic acid on the crystal structure, microstructure and magnetic properties was investigated using X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer, respectively. The results demonstrated that well crystalline single cubic spinel Mn x Mg1?/strong> x Fe2O4 phase was formed at annealing temperature 1,200?°C for time 2?h. The crystallite size, lattice parameter (a) and the unit cell volume were observed to increase as the annealing temperature and the Mn2+ content were increased. The microstructure of the formed powders was synthesis conditions dependent. The produced powders were found to be well defined cubic-like structure with high homogeneity by increasing Mn2+ ion concentration up to 0.8. Furthermore, the change of carboxylic acid influenced the microstructure of the formed Mn x Mg1?/strong> x Fe2O4 powders as the results of change of the amount of released carbon dioxide and water vapor during the annealing. The magnetic properties were sensitive to annealing temperature, Mn2+ ion molar ratio, and type of carboxylic acid. Good saturation magnetization (Ms?=?~47.0?emu/g) was achieved with Mn2+ ion ratio 0.8 at annealing temperature 1,200?°C for 2?h using tartaric acid as an organic fuel whereas the maximum saturation magnetization (Ms?=?~49.4?emu/g) was obtained using citric acid as a fuel at the similar conditions and Mn2+ ion content 0.5.