摘要
高纯度钡铁氧体磁粉(BaFe12O19)是一种重要的磁记录介质[1-4],而除了磁粉的纯度外,颗粒的尺寸和形状也对磁粉的性能有重要的影响[5,6],Deng等人[7]采用在针状γ-Fe2O3颗粒表面包覆钡铁氧体的方法获得针状钡铁氧体磁性颗粒,大大提高了材料的磁性能,但对直接制备棒状钡铁氧体颗粒的报道较少.
A rodlike barium ferrite precursor with an average size of 0.72 similar to 19.6 mu m and aspect ratio of 2.6 similar to 8.3 has been successfully prepared in an inverse microemulsion consisting of isooctane, cetanyl trimethyl ammonium bromide (CTAB), n-C4H9OH and water with ammonia and ammonium oxalate as precipitants. On sintering at 780 (C, the rodlike precursor particles could be transformed into rodlike particles of barium ferrite (BaFe12O19) with the average size and aspect ratio of 0.69 similar to 18.2 Rm and 2.3 similar to 5.8, respectively. The effect of volume ratio of aqueous phase to oleic phase, the starting concentrations of metal ions and the starting concentration ratios of metal ions to precipitants were investigated.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2005年第4期607-611,共5页
Chinese Journal of Inorganic Chemistry
基金
山东省优秀中青年科学家基金资助项目(No.2004BS04015)。
