摘要
O引言纳米软磁材料由于粒子尺寸小、比表面大,表现出许多与传统常规尺寸材料不同的物化性能[1],具有十分诱人的应用前景,通过将其制成磁头、磁开关、存储器、磁屏蔽、磁性传感器、脉冲变压器等功能部件,可广泛应用于电力、航空机载通讯设备、高性能信息处理、微机械电子系统等许多方面.采用该材料代替常规软磁材料后,可大大降低成本,减小体积,降低内耗,并提高传感器的灵敏度,特别有利于提高高频环境使用下的航空、航天机载通讯产品的竞争力.Mn-Zn铁氧体由于具有高的磁导率和低损耗,在电子器件中得到广泛应用,传统的陶瓷合成工艺已不能满足社会发展的需要[2].化学法制备超细Mn-Zn铁氧体粉末已受到了研究者的广泛关注.其目的是通过改善粉末的微观结构(如粒子大小、形貌、物相等)来提高其磁性能.
Nanosize manganese zinc ferrites were fabricated by hydrothermal precipitation route using Fe-2(SO4)(3), ZnSO.7H(2)O, MnSO4.H2O as material, then some calcinated at 500 degreesC and studied by XRD, TEM, IR and VSM. The results showed that the products were spinel crystal structure and uniformly sized nanoparticles (15similar to25 nm) with little aggregation. The analysis of IR showed that the superficial water can be eliminated, but that was embedded in crystal lattice can not be removed by calcinating. The effect Zn content x on the lattice (a) of nanosize Mn1-xZnxFe2O4 was also discussed. The lattice of nanosize Mn(1-x)Fe(2)O(4)decreases with x increasing; and its value deviated the standard lattice (a(0)) of normal size manganese zinc ferrites. A lot of water was absorbed during the hydrothermal process owing to the large surface of nanosize particles. The change of magnetic properties of Mn(x)Zn(1-x)O(4)with x increasing was studied: nanosize MnxZn1-xO4 particles synthesized by us exhibited peculiar magnetic proper-ties curve with Zn content (x) increasing, Superparamagnetic behaviors of the synthesized ZnFe2O4 samples were confirmed by magnetic characterization, which can be explained by the difference between the distribution of the metal ions (Mn2+ Zn2+ and Fe3+) among the tetrahedral (A) and the octahedral (13) sites of nanosize ferrite and that of bulk ferrite.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2004年第5期608-612,共5页
Chinese Journal of Inorganic Chemistry
基金
天津市科委培育项目(No.03310311)资助。
