Modified sol-gel synthesis of nanosized magnesium titanium substituted barium hexaferrite and investigation of the effect of high substitution levels on the magnetic properties

作者：Jazirehpour M^*; Shams M H; Khani O

来源：Journal of Alloys and Compounds, 2012, 545: 32-40.

DOI：10.1016/j.jallcom.2012.08.043

• Sol-gel
• Doped hexaferrite
• Substitution
• Magnetic properties

Nanosized BaFe12-xMg0.5xTi0.5xO19 (X = 0.0-5.0) is synthesized by a modified sol-gel process that provides a reliable capability for efficient substitution of elements such as Ti in high substitution levels such as X = 5. Efficient substitution of Ti in a hexaferrite by sol-gel method is not easy due to some technical challenges unless by using a high calcination temperature which negates the formation of nanosized particles. The effectiveness of substitution is improved by using several modifications in conventional sol-gel process. Application of citrato-peroxo-titanate as a titanium source instead of commercial sources can be mentioned as one of the most significant modifications. Moreover, a certain oxidizing condition in all samples with different substitution levels is kept by setting oxidizing factor as a processing parameter. Because of the modifications, achievement of Mg-Ti substituted Ba-hexaferrite nanoparticles with a mean particle size of 30 nm becomes possible at a calcination temperature of 950 degrees C. Variations of crystalline structure and magnetic properties of Ba-hexaferrite nanoparticles with substitution amount are also investigated and discussed in detail.

• 出版日期2012-12-25