摘要
以聚乙烯吡咯烷酮(Polyvinylpylrrolidone,PVP)和金属盐为原料,采用静电纺丝制备了Sr1-xLaxZnxFe12-xO19/PVP复合纤维前驱体,前驱体经焙烧后得到Sr1-xLaxZnxFe12-xO19纳米纤维。通过XRD、SEM、EDS和VSM对复合纤维前驱体及所制备的Sr1-xLaxZnxFe12-xO19纳米纤维进行了表征。结果表明,焙烧温度和掺杂离子浓度对Sr1-xLaxZnxFe12-xO19纳米纤维的微观结构和磁性能有较大的影响。随着掺杂离子浓度的增大,组成纤维的晶粒尺寸显著减小,由x=0时的49.9nm减小为x=0.4时的41.1nm。Sr1-xLaxZnxFe12-xO19纳米纤维的比饱和磁化强度随着掺杂离子浓度升高先增大后减小,在x=0.2时达到最大值72Am2 kg-1;而矫顽力却随掺杂离子浓度的提高单调减小,由x=0时的413kAm-1减小为x=0.4时的288kAm-1。
Sr1-xLaxZnxFe12-xO19/poly （vinyl pyrrolidone） （PVP） （0.0≤x≤0.4） precursor nanofibers were prepared by electrospinning from starting reagents of metal salts and PVP. The Sr1-xLaxZnxFe12-xO19 nanofibers were obtained subsequently by calcination of these precursors at 800-1100℃. The composite fibers and Sr1-xLaxZnxFe12-xO19 nanofibers were characterized by XRD, SEM, EDS and VSM. The results show that, the Sr1-xLaxZnxFe12-xO19 nanofiber＇s microstructure and magnetic property are mainly influenced by the calcination temperature and the substituted ions contents. The nanofiber grain size is in a nanoscale from 49.9 to 41.1 nm corresponding to the substitution content from 0 to 0.4. The specific saturation magnetization of Sr1-xLaxZnxFe12-xO19 nanofibers initially increases with the La-Zn content, reaching a maximum value 72 Am2·kg-1 at x=0.2, and then decreases with a further La-Zn content increase up to x=0.4, while the coercivity exhibits a continuous reduction from 413 （x=0） to 288 kAm-1 （x=0.4）.
出处
《陶瓷学报》
CAS
北大核心
2011年第2期164-170,共7页
Journal of Ceramics
基金
国家自然科学基金(编号:50674048)
江苏省研究生培养创新工程(编号:CX09B-192Z)
