Synthesis,Characterization and Electromagnetic Studies on Nanocrystalline Nickel Zinc Ferrite by Polyacrylamide Gel

Ruiting MA~(1,2) Yi WANG~1 Yanwen TIAN~2 Chunli ZHANG~1 Xikun LI~1 1)Materials Science and Engineering College,Shenyang Ligong University,Shenyang 110168,China 2)School of Materials and Metallurgy,Northeastern University,Shenyang 110004,China

摘 要：<正>Nanocrystalline nickel zinc ferrite powders (Ni_xZn_1-xFe₂O₄,A for x=0,B for x=0.2,C for x=0.5,D for x= 0.8 and E for x=1)were synthesized by polyacrylamide gel method.X-ray diffraction（XRD）,transmission electron microscopy（TEM）and wave-guide were used to characterize the composition.The XRD results show that the dried gel powders are amorphous,and the characteristic peaks of the spinel Ni_0.5Zn_0.5Fe₂O₄ appear after the gel is calcined at 400℃for 1h.When the calcining temperatures are 600 and 800℃,the average grain sizes are identified by TEM to be 10 and 30 nm,respectively.The Ni_xZn_1-xFe₂O₄ powders have both dielectric loss and magnetic loss in the frequency range of 8.2-11.0GHz.With the increase of Ni²⁺ ions content,the dielectric parameters（ε′） and permeability （u′） of the Ni_xZn_1-xFe₂O₄ powders decrease while the dielectric loss（ε″）,magnetic loss（u″）and the reflection loss increase.

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