静电纺丝法制备Sr_(1-x)La_xFe_(12-x)Co_xO_(19)纳米纤维及其磁性研究  

Preparation and Magnetic Properties of Sr_(1-x)La_xFe_(12-x)Co_xO_(19) Nanofibers by Electrospinning

作　　者：李从举[1,2] 张莲莲[1,2] 王娇娜[1,2] 

机构地区：[1]北京服装学院材料科学与工程学院,北京100029 [2]北京市服装材料研究开发与评价重点实验室,北京100029

出　　处：《无机材料学报》2011年第8期797-801,共5页Journal of Inorganic Materials

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863项目(2007AA021906);国家973项目(2010CB933501)~~

摘　　要：采用溶胶?凝胶过程和静电纺丝技术相结合的方法,制得了PVP/Sr1-xLaxFe12-xCoxO19(x=0～0.5)复合纳米纤维,经过煅烧处理过程,获得了Sr1-xLaxFe12-xCoxO19(x=0～0.5)纳米纤维.通过SEM、TEM、XRD和VSM等技术对样品的形貌、物相、结构以及磁性能进行了表征.结果表明,800℃煅烧后的Sr1-xLaxFe12-xCoxO19(x=0.5)纳米纤维的直径主要分布在80～150 nm;这些纤维在室温下都具有硬磁特性,化学组成对铁氧体的磁性能有着显著的影响,当x≥0.3时,样品中同时出现M型的SrFe12O19、LaFeO3和CoFe2O4;在适当范围内(x≤0.1),La3+-Co2+的掺杂有利于改善锶铁氧体纤维的永磁性能,相应的矫顽力、饱和磁化强度和剩余磁化强度分别为Hc=432.02kA/m,Ms=54.7A.m2/kg,Mr=28.9A.m2/kg,与传统溶胶?凝胶法在相同条件下制得的Sr0.9La0.1Fe11.9Co0.1O19粉体样品相比,磁性能也有显著提高.PVP/Sr1-xLaxFe12-xCoxO19（x=0-0.5） composite nanofiers were fabricated by Sol-Gel process and electrospinning technique.After high temperature calcination,Sr1-xLaxFe12-xCoxO19（x=0-0.5） ferrite nanofi-bers were successfully obtained.The morphology,phases,structure and magnetic properties of the nanofibers were characterized by Scanning electron microscope（SEM）,Transmission electron microscope（TEM）,X-ray diffraction（XRD） and Vibrating sample magnetometer（VSM）.The results show that the samples have an uni-form diameter of 80-150 nm after calcined at 800℃.The Sr1-xLaxFe12-xCoxO19（x=0-0.5） ferrite nanofiers all exhibit a hard magnetic performance,and chemical composition have considerable influence on magnetic properties of these ferrite nanofibers.The Sr1-xLaxFe12-xCoxO19（x=0-0.5） ferrite nanofiers exhibit M-type strontium ferrites,CoFe2O4 phase and LaFeO3 phase at x≥0.3.The substitutions of La^3＋ and Co^2＋ obviously increase the magnetic properties of the as-prepared samples at x≤0.1,the coercivity（Hc）,saturation magneti-zation（Ms） and remanent magnetization（Mr） of Sr0.9La0.1Fe11.9Co0.1O19 nanofibers are 432.02 kA/m,54.7 A.m^2/kg,28.9 A.m^2/kg,respectively.The magnetic properties of the fibers increase significantly,com-pared with that of the Sr0.9La0.1Fe11.9Co0.1O19 powder samples.

关 键 词：静电纺丝 M型SrFe12O19 La-Co取代 磁性能 

分 类 号：TQ174[化学工程—陶瓷工业]