材料期刊网

以聚乙烯吡咯烷酮（PVP）和金属盐为原料,利用静电纺丝法成功制备出了摩尔比为1：1的SrTiO3-SrFe12O19磁电复合纳米纤维。并通过FT-IR,XRD,SEM和VSM等技术对纤维前驱体及其产物的结构、热处理产物的物相、形貌及磁性能进行了表征。结果表明,样品经900℃焙烧2h后,即可得到纯的SrTiO3和SrFe12O19,两相的纳米晶大小分别为24 nm和33 nm。此时得到的纤维粗细均匀,直径在100-150 nm之间。纳米晶粒的大小随着焙烧温度的增加而增加,SrTiO3的加入明显抑制了SrFe12O19晶粒的长大。样品的饱和磁化强度和剩磁随着晶粒的增加而增加。随着焙烧温度从900℃升高到1050℃,样品的矫顽力先增大后减小,在950℃时达到最大值520.2kA.m-1,相比纯的SrFe12O19提高了很多。

SrTiO3/SrFe12O19 nanofibers with a molar ratio of 1：1 and an average diameter about 120 nm were prepared by electrospinning.Effects of calcination temperature on the formation,crystallite size,morphology and magnetic property were studied by using infrared spectroscopy,X-ray diffractometry,scanning electron microscopy and vibrating sample magnetometry.Strontium ferrite and titanate are formed after being calcined at 900 ℃ for 2 hours and the composite nanofibers are fabricated from nanograins of SrTiO3 about 24 nm and SrFe12O19 around 33 nm.Crystallite sizes for the nanofibers increase with increasing calcination temperature,and the addition of SrTiO3 has an obvious suppression effect on SrFe12O19 grain growth.Saturation magnetization and remanence tend to increase with increasing the crystallite size.With the increase of calcination temperature from 900 to 1050℃,the coercivity increases initially,achieves a maximum value of 520.2 kA m-1 at 950 ℃,and then shows a reduction tendency.