Hydrothermal synthesis of Nano Ba-ferrite with Additional High Pressure under the magnetic field

摘要：

　　The pressure of hydrothermal system is increased based on the traditional hydrothermal synthesis to prepare nano-barium ferrite at the reaction temperature of 180oC under different magnetic field.Using XRD,SEM and TEM methods,the phase composition and micro structure of the nano-barium ferrite powder obtained under different initial pressure(1.0atm,1.5atm and 2.0atm)is discussed.All the powder prepared under different initial pressure is mainly composed of BaFe12O19.But the morphology of the products is different.Flake BaFe12O19 is obtained under the 10T magnetic field when the initial pressure is 1.5atm and 2.0atm.Moreover,the degree of crystallinity of hydrothermal products is also improved by the application of magnetic field and additional high pressure.Hexagonal flake grains of BaFe12O19 with excellent crystallization have been prepared under 6T magnetic field.when the initial pressure reached 2.0atm,some of the rod-like BaFe12O19 self-organized to form ordered forked structure through oriented attachment due to the multiple influence of pressure and magnetic field on crystal face energy.It can be found that the additional high pressure will disturb the influence of the magnetic field on one-dimensional growth.And the phenomenon of oriented attachment can be regarded as the intermediate state between the one-dimensional rod and two-dimensional sheet.

关键词： Hydrothermal Barium Ferrite Pressure Morphology magnetic field

作者: ZHONG Yun-bo SUN Zong-qian XU Bin ZHENG Tian-xiang

作者单位: Shanghai Key Laboratory of Modern Metallurgy and Material Processing,Shanghai University,200072 Shanghai,China

会议类型: 国际会议

会议名称: The 7th International Conference on Electromagnetic Processing of Materials(第七届冶金与材料电磁过程国际大会)

会议地点: 北京

会议语种:英文

页码: 1-6

在线出版日期: 2012-10-22（万方平台首次上网日期，不代表论文的发表时间）