六角晶系钡铁氧体纳米晶微波吸收剂的晶化特性研究  

Study of the Crystallization Properties of Hexagonal Ba-ferrite Nanocrystal Microwave-absorbing Agents

作　　者：郭方方[1] 徐劲峰[1] 徐政[1] 张栓勤 

机构地区：[1]同济大学材料学院,上海200092 [2]总装工程兵科研一所,江苏无锡214035

出　　处：《材料科学与工程学报》2004年第6期871-874,共4页Journal of Materials Science and Engineering

摘　　要：采用柠檬酸sol gel工艺 ,制备了W型、M型平面六角晶系的钡铁氧体纳米晶。采用XRD ,TEM和热分析对其物相组成、显微结构、晶化过程等进行研究 ,发现采用本文所述工艺 ,通过对晶化条件的控制 ,可避免形成α Fe2 O3非磁性伴生相 ,在 75 0°C的较低温度下 ,就可得到均匀单一的铁氧体纳米晶。本文首次详细探讨了晶化反应机制和晶化条件对纳米晶粒子尺寸及分布、形貌和微波吸收性能的影响。Citrate sol-gel process was used to prepare W type and M type hexagonal Ba-ferrite nanocrystals. X-ray diffractometry, Transmission electron microscopy and thermal analysis were used to study the detailed information on the crystallography of the ferrite nanocrystals and crystallization process. It was found that we could obtain uniformity and single phase Ba-ferrite nanocrystals at lower temperature 750°C and avoid forming α-Fe 2O 3 nonmagnetic concomitant phase by controlling the crystallization conditions. The reaction mechanism and the effect of crystallization conditions on particle size and its distribution, morphology and microwave-absorbing properties of hexagonal Ba-ferrite nanocrystal were firstly dicussed detailedly.

关 键 词：晶化条件 钡铁氧体 纳米晶粒 晶化过程 晶系 sol-gel工艺 Α-FE2O3 微波吸收 磁性 特性研究 

分 类 号：TQ424.25[化学工程] O643[理学—物理化学]