摘要
采用二次化学共沉淀法制备出六角或近六角片状BaFe_(12)O_(19),其颗粒径向尺寸和径厚比分别为0.4-2μm和4-20。通过XRD、FTIR、TG/DTA及SEM/EDS分析技术研究了片状BaFe_(12)O_(19)的形成历程。结果表明:前驱体为非晶态BaCO_3、低结晶态Fe(OH)_3和晶态α-Fe_2O_3包覆原料BaFe_(12)O_(19)复合物;前驱体在焙烧过程中经过Fe(OH)_3脱水、BaCO_3分解反应、中间相α-Fe_2O_3和BaO反应得到终产物BaFe_(12)O_(19)。基于形成历程,六角片状BaFe_(12)O_(19)较原料BaFe_(12)O_(19)表现出显著提高的颗粒径向尺寸和径厚比、较高的纯度和略低的结晶有序程度,进而表现出明显提高的矫顽力、略低的饱和磁化强度和剩余磁化强度。
Hexagonal plate-shaped BaFe12019 ferrites are prepared by the second chemical co- precipitation method using co-precipitation synthesized-BaFe12019 ferrites as template materials. The particle size of the prepared plate-shaped BaFe12019 ferrites is in the range of 0.4-2 #m with a diameter to-thickness ratio of 4-20. The synthesis process is studied by using XRD, FTIR, TG/DTA, SEM/EDS. It is shown that the precursor was a composite of BaFe12019 coated by non-crystalline 13aCO3, low-crystalline Fe（OH）3 and crystalline a-Fe203. During calcinations,the precursor experiences dehydration of Fe（OH）3, decomposition of BaCO3, and the reaction of a-Fe203 and BaO, and finally produces BaFe12019. The prepared plated-shaped t3aFe12019 ferrite presents a higher coercivity and lower saturation magnetization and remanence, owing to its higher purity, slightly poor crystallinity, larger radial size and diameter-length ratio.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2012年第1期107-112,共6页
Chinese Journal of Materials Research
基金
总装备部预研51310060303资助项目~~
