Ni~(2+)含量对纳米晶Ni_xZn_(1-x)Fe_2O_4电磁性能的影响

以丙烯酰胺为聚合单体,N,N′-亚甲基双丙烯酰胺为网络剂,通过高分子凝胶法制备了尖晶石型Ni_xZn_(1-x)Fe_zO_4(x=0,0.2,0.5,0.8和1)纳米晶.采用FT-IR,XRD,TEM和波导法对产物进行表征.结果表明,纳米晶Ni_xZn_(1-x)Fe_2O_4红外吸收峰的晶格常数和电磁性能强烈地依赖于Ni~(2+)含量,随着Ni~(2+)含量增加,红外光谱显示金属一氧离子(M-O)化学键的特征吸收峰出现了蓝移,该峰蓝移60 cm~(-1).通过TEM照片可知Ni_xZn_(1-x)Fe_2O_4的平均粒径随x的变化较小,x分别为0,0.5和1时,粒子的平均粒径分别为12,1...

Effect of Ni2+ Ion Content on Electromagnetic Properties of Nanocrystalline NixZn1-xFe2O4 Powder

The spinel-type nanocrystalline nickel-zinc ferrite powder (NixZn1-xFe2O4, where x = 0, 0.2, 0.5, 0.8 and 1) was synthesized by polyacrylamide gel method with acrylamide as monomer and N, N'-Methylenediacrylamide as lattice agent. FT-IR, XRD, TEM and waveguide were used to characterize the composition and morpholopy of the powder. The results showed that both the lattice constant and electromagnetic properties highly depends on Ni²⁺ content and a 60 cm^-1 blue shift of the characteristic absorption peaks of M-O (metal and oxygen) ion bonds comes to pass with increasing Ni²⁺ content as shown in FT-IR spectra and, as shown in TEM images, the average particles size of the NixZn1-xFe2O4 changes little with x value, i.e., the size is 12, 17 and 15 nm when x is 0, 0.5 and 1, respectively. And the lattice constant decreases to 0.8327 nm from 0.8456 nm as calculated from XRD patterns. In addition, both the dielectric loss (tan Ε) and magnetic loss (tan μ) of the nanocrystalline NixZn1-xFe2O4 increase obviously with increasing Ni²⁺ content within the tasting frequency range.