Synthesis process of Ba-ferrites from α-FeOOH and γ-FeOOH and investigation of magnetic properties

• 来源期刊: 科学通报(英文版)
• 学科: 工学
• 关键词: FeOOH 钡铁氧体 合成过程 磁特性 Fe2O3 X射线衍射 铁氧体生产 BaCO3
• 年，卷（期）: 2010,（18）
• 页码范围: 1952-1956
• 页数: 5页
• 分类号: TQ586.1 TM277
• 语种: 英文

摘要

The claviform BaFe12O19 crystals were synthesized by the precipitation-toptactic reaction method using α-FeOOH and γ-FeOOH as raw materials respectively.The synthesis processes of BaFe12O19,studied by XRD,SEM,EDS,FT-IR,and TG-DTA techniques,included preparations of precursor γ and precursor α,formations of α-Fe2O3 and BaFe2O4,and production of rod-like BaFe12O19 through dehydroxylation of pod-like FeOOH,followed by reactions of α-Fe2O3 with BaCO3 and BaFe2O4.The crystallinity of α-Fe2O3 and BaCO3 from precursor α was better than from precursor γ due to the direct dehydroxylation of α-FeOOH,resulting in a lower nucleation rate and better crystallinity of BaFe2O4.BaFe12O19 prepared from precursor α showed lower crystallinity and purity with a higher length-diameter ratio than from precursor γ.The VSM results proved that the appearance of final products had an important influence on magnetic properties.