摘要
以硝酸钡、硝酸铁和柠檬酸为原料,采用溶胶-凝胶法制备了单相钡铁氧体(BaFe12O19)纳米粉体,并进一步研究了n(Fe)/n(Ba)、热处理温度对产物组成、形貌以及磁性能的影响。用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和振动样品磁强计(VSM)分别对样品的组成、形貌和磁性能进行了表征。实验结果表明,当煅烧温度不变时,样品的晶粒尺寸随着n(Fe)/n(Ba)的增大而变大,磁性能随n(Fe)/n(Ba)的增大而增强;当n(Fe)/n(Ba)不变时,样品的晶粒尺寸随着煅烧温度的升高而变大。当n(Fe)/n(Ba)=12时,在800℃煅烧2h得到单一晶型的钡铁氧体粉体。1000℃时样品的磁性能最佳,饱和磁化强度(Ms)为70.88A.m2/kg,矫顽力(Hc)为372.89kA/m。
A precursor was prepared by sol-gel method with Ba（NOa ）2, Fe（NOa ）3 . 9 H2O and C6 H8 O7.H2O as raw materials. Single-phase barium hexaferrite（BaFe12O19） nanoparticles were synthesized by calcining the precursor. And the influence of Fe/Ba molar ratio and calcination temperature on the crystal structure, morphology and magnetic properties were studied by X-ray diffraction（XRD）, scanning electron microscope（SEM） and vibrating sample magnetometer（VSM）. The experimental results show that the crystalline size and magnetic properties increase with the increasing of the Fe/Ba molar ratio when the calcination temperature is constant. On the other hand, the crystalline size grows with the increasing of the calcination temperature when Fe/Ba molar ratio is constant. Furthermore, when Fe/Ba molar ration is 12, the single-phase barium hexaferrite can be obtained after calcined at 800℃ for 2h. The barium hexaferrite sample calcined at 1000℃ exhibited the best magnetic properties： the saturation magneti- zation Ms=70. 88A .m^2/kg and Hc=372.89kA/m.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2011年第24期107-110,114,共5页
Materials Reports
基金
国家自然科学基金(51073005)
北京市自然科学基金(2112013)
北京市教委科技发展计划重点项目(KZ201010012012)
北京市属高等学校人才强教深化计划(IHLB)
国家973项目(2010CB933501)
