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赵艳秋,韩续豪,边璐鹏,秦晓宁,孙继兵.利用PS模板制备多孔SrFe12O19薄膜的研究[J].稀有金属材料与工程(英文),2019,48(7):2344~2351.[Zhao Yanqiu,Han Xuhao,Bian Lupeng,Qin Xiaoning and Sun Jibing.Study of Porous SrFe12O19 Thin Films Using PS Template Assistant[J].Rare Metal Materials and Engineering,2019,48(7):2344~2351.]
Study of Porous SrFe12O19 Thin Films Using PS Template Assistant
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Received:January 23, 2018  Revised:March 21, 2018
Key words: Magnetic material  strontium ferrite  porous film  dip-drawing method  PS template
Foundation item:国家自然科学基金资助(项目号51671078,51271072),国家自然科学青年(51301056),河北省自然科学(E2015202008)
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Zhao Yanqiu,Han Xuhao,Bian Lupeng,Qin Xiaoning and Sun Jibing  
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      In this paper, ordered porous strontium ferrite (SrFe12O19) thin films were prepared by dip-drawing method using polystyrene (PS) spheres template. The PS template was orderly assembled on clean silicon substrate through PS sphere emulsion, which was synthesized by microemulsion polymerization. The porous SrFe12O19 thin films were fabricated by filling the SrFe12O19 precursor sol prepared by sol-gel method on the interspaces among adjacent PS spheres in the PS template, and then removing the PS spheres by heating at 900 °C for 2 h. The effects of PVP content on the microstructure of PS spheres and the drawing time on the microstructure of PS template and the porous SrFe12O19 thin films were investigated. Then the formation mechanism of porous SrFe12O19 thin films was discussed, and the corresponding model was established. The results show that PS spheres with uniform particle size could be obtained by adding 0.2 g PVP, and the interspaces between the microspheres were obvious; the single layer ordered PS template could be obtained by immersing the silicon substrate in the PS sphere emulsion for 10 s. The pure SrFe12O19 porous thin film with honeycomb structure and a pore diameter of about 200 nm can be prepared by immersing PS template in the SrFe12O19 precursor sol for 10 s, and it shows the excellent hard magnetic properties: saturation magnetization of 27.9 emu/g, remanence of 15.5 emu/g and coercivity of 2613.4 Oe.