论文部分内容阅读
铁磁–铁电复合纤维是一种新型功能陶瓷纤维材料,可潜在地用于磁、电能量转换。以柠檬酸和金属盐为原料,采用有机凝胶前驱体转化法制备了xCoFe2O4–(1–x)BaTiO3(x=0.2,0.3,0.4,0.5)纳米复合纤维。利用红外光谱、热重–差热分析、X射线衍射、扫描电子显微镜和振动样品磁强计等对纤维前驱体凝胶的结构、热分解过程及热处理产物组成、形貌和磁性能进行表征。研究表明:所制得的复合纤维直径细小、均匀、致密,最小直径达到1μm,长径比可达1×105。随着焙烧温度从900℃升高到1180℃,复合纤维中BaTiO3和CoFe2O4平均晶粒尺寸为20～70nm。xCoFe2O4–(1–x)BaTiO3纳米复合纤维的饱和磁化强度Ms与CoFe2O4在复合纤维中所占的摩尔分数x之间存在线性关系。
Ferromagnetic ferroelectric composite fiber is a new type of functional ceramic fiber material that can potentially be used for magnetic and electrical energy conversion. The xCoFe2O4- (1-x) BaTiO3 (x = 0.2,0.3,0.4,0.5) nanocomposite fibers were prepared by organic gel precursor transformation using citric acid and metal salts as raw materials. The structure, thermal decomposition process and the composition, morphology and magnetic properties of the precursor were characterized by FTIR, TG-DTA, X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. The results show that the diameter of composite fiber is small, uniform and dense, the minimum diameter is 1μm and the aspect ratio is up to 1 × 105. As the calcination temperature increased from 900 ℃ to 1180 ℃, the average grain size of BaTiO3 and CoFe2O4 in composite fibers was 20 ~ 70nm. There is a linear relationship between the saturation magnetization Ms of xCoFe2O4- (1-x) BaTiO3 nanofibers and the molar fraction x of CoFe2O4 in the composite fibers.