摘要
BaFe_(12)O_(19)纳米粒子具有高矫顽力、高饱和磁化强度、分散性好的特点,超细的BaFe_(12)O_(19)纳米粒子在磁性器件、微波吸收、生物医学、磁记录等领域具有广阔应用前景。然而,制备超细的高性能BaFe_(12)O_(19)纳米粒子仍然是该领域的难点。提出一种简便的共沉淀法制备M型BaFe_(12)O_(19)纳米粒子,成功获得高性能、分散性好的超细BaFe_(12)O_(19)纳米粒子,同时研究了制备工艺对粒子结构和性能的影响。结果表明:pH对BaFe_(12)O_(19)纳米粒子的成分、结晶度、形貌特征及磁性能影响显著,当pH为9时,颗粒结晶度高、分散性较好;随前驱体比例的升高,BaFe_(12)O_(19)纳米粒子的结晶度、形貌特征及磁性能随之发生变化,当前驱体比例为1∶12时,颗粒结晶度较高、磁性能高;在60℃的沉淀温度下沉淀反应1.5 h,当搅拌速率提升到600 r/min时,可获得高结晶度、矫顽力为5072 Oe、饱和磁化强度高达70 emu/g、平均粒径仅为33 nm的超细BaFe_(12)O_(19)纳米粒子。
BaFe_(12)O_(19)nanoparticles with high coercivity,high saturation magnetization,good dispersion and ultra-fine BaFe_(12)O_(19)nanoparticles have broad application prospects in magnetic devices,microwave absorption,biomedicine,magnetic recording and other fields.However,the preparation of ultra-fine high-performance BaFe_(12)O_(19)nanoparticles is still a difficulty in this field.A simple co-precipitation method for preparing M-type BaFe_(12)O_(19)nanoparticles was proposed,and ultrafine BaFe_(12)O_(19)nanoparticles with high performance and good dispersion were obtained successfully.The effect of preparation process on the structure and properties of the particles was also studied.The results show that pH has significant effects on the composition,crystallinity,morphology and magnetic properties of BaFe_(12)O_(19)nanoparticles.When pH is 9,the particles have high crystallinity and good dispersion.The crystallinity,morphology and magnetic properties of BaFe_(12)O_(19)nanoparticles change with the increase of precursor ratio.When the precursor ratio is 1:12,the crystallinity and magnetic properties of BaFe_(12)O_(19)nanoparticles are higher.At the precipitation temperature of 60℃for 1.5 h,when the stirring rate is increased to 600 r/min,ultrafine BaFe_(12)O_(19)nanoparticles with high crystallinity,coercivity of 5072 Oe,saturation magnetization of 70 emu/g and average particle size of 33 nm can be obtained.
作者
申佳宁
常玲
李明宇
陈婉晴
佟冰
裴文利
SHEN Jianing;CHANG Ling;LI Mingyu;CHEN Wanqing;TONG Bing;PEI Wenli(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,Liaoning,China;Key Laboratory of Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110819,Liaoning,China;Fushun Hanking Aoniu Mining Co.,Ltd.,Fushun 113125,Liaoning,China)
出处
《金属功能材料》
CAS
2024年第2期22-31,共10页
Metallic Functional Materials
基金
国家自然科学基金项目(52071070,52371179)
国家重点研发计划(2021YFB3501404)
云南省重大科技专项-新材料重大专项(202102AB080008-1)
中央高校基础研究基金(N2102004,N2017003)。
