以柠檬酸、乳酸和金属硝酸盐为原料,采用有机凝胶先驱体转化法制备了中空M型(BaFe12O19)纤维.通过FTIR、TG/DSC、XRD、SEM和VSM等技术对所得纤维进行了表征,并初步探讨了中空纤维的形成机制.结果表明,凝胶的可纺性与其组成和pH值有关,在pH值约等于4.5时,可纺性最好.纤维直径可小于1 μm,长径比可达8×105,组成纤维的晶粒尺寸大都在数十个纳米.中空BaM纤维在室温下的饱和磁化强度为22.5 Am2、Kg,矫顽力为300 kA/m.
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