Influences of La3+ Substitution on Structure and Electromagnetic Properties of Nanocrystalline Nickel Ferrites

摘要：

Nanocrystalline nickel ferrites with substitution of Fe<3+> by rare-earth La<3+>, according to the formula NiLa<,x>Fe<,2-x>O<,4> (with x=0, 0.05, 0.1 and 0.15), were prepared by polyacrylamide gel method. Influences of the amount of La<3+> substitution on the structure and electromagnetic properties of NiLa<,x>Fe<,2-x>O<,4> compounds were systematically investigated by DSCTG, XRD, TEM and wave-guide method. XRD results indicated that the pure spinel-type crystal structure of the NiLa<,x>Fe <,2-x>O<,4> (x=0 and 0.05) was obtained at 500℃. TEM results showed that the average particle sizes of NiFe<,2>O<,4> and NiLa<,0.1>Fe<,1.9>O<,4> particles were about 10 and 15nm, respectively. The complex permittivity and complex permeability was measured in the frequency range of 8.2~12.4GHz. The results revealed that the nanocrystalline NiLa<,x>Fe<,2-x>O <,4> had both dielectric loss and magnetic loss in the frequency range of 8.2~12.4GHz. The tgδ<,ε> and tgδ<,m> of NiLa<,x>Fe<,>O<,4> (with x=0 and 0.05) decreased with the increase of La<3+> ions content, and some strong resonance peaks of the tgδ<,ε> and tgδ<,m> of NiLa<,x> Fe<,2-x>O<,4> (with x=0.1 and 0.15) appeared because of the secondary phases (LaFeO<,3>) and more lattice defects.

关键词： polyacrylamide gel nanocrystalline lanthanum substitution nickel ferrite electromagnetic properties rare earths

作者: Ma Ruiting(马瑞廷) Tian Yanwen(田彦文) Zhou Li(周莉) Bi Shaodan(毕韶丹) Li Xikun(李喜坤)

作者单位: Materials Science and Engineering school, Shenyang Ligong University, Shenyang 110168, China School School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China School of Materials & Chemistry, Liaoning University of Petroleum and Chemical Technology, Fushun 11 Materials Science and Engineering school, Shenyang Ligong University, Shenyang 110168, China

会议类型: 国际会议

会议名称: 第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)

会议地点: 包头

会议语种:英文

页码: 17-20

在线出版日期: 2007-08-07（万方平台首次上网日期，不代表论文的发表时间）