摘要
采用溶胶-凝胶法制备稀土Nd掺杂钛酸钡纳米粉体。采用X射线衍射(XRD)、矢量网络分析仪等手段分别分析表征了样品的微结构和高频电磁特性。结果表明,Nd离子掺杂的钛酸钡样品在750℃温度下退火1h,结晶良好。随着Nd掺杂量的提高,晶粒细化。Nd离子掺杂后,在高频下钛酸钡纳米粉体的介电常数的实部略有减小,虚部峰值得到提高,复介电常数和复磁导率的峰位均发生蓝移,粉体材料在2～18GHz范围内的反射损耗得到提高,吸收频带拓宽明显。
Nano-particles of Nd-doped BaTiO3 were prepared by modified sol-gel method.The microstructure and high-frequency electromagnetic properties were characterized by using X-ray diffraction（XRD）,vector network analyzer.The results showed that Nd-doped barium titanate samples crystalline sound with annealed 1h at 700℃.With the increase of Nd content,the lattice size of the BaTiO3 powders decreased with the grain refinement.Within the bandwidth of 2-18GHz,the real part of dielectric constant of 5% Nd-doped BaTiO3 powders decreased slightly with the stability improved,but the imaginary part of dielectric constant greatly increased.Both the peak of the complex permittivity and permeability has blue shift with Nd-doped.The reflection loss of 5% Nd-doped BaTiO3 powders is greatly increased and reflection peak has blue shift compared with pure BaTiO3 powders.The above shows that Nd-doping can greatly improved the microwave absorption properties of the BaTiO3.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第5期778-781,共4页
Journal of Functional Materials
基金
中南大学研究创新基金资助项目(2009ssxt136)
关键词
ND掺杂
钛酸钡
复介电常数
复磁导率
吸波特性
Nd-doping
BaTiO3
complex permittivity
permeability
microwave absorbing properties
