Dissertation
Dissertation > Mathematical sciences and chemical > Physics > Solid State Physics > Solid nature of the

Study on Manufacture and Microwave-Absorption Properties of Z/Y Type Hexagonal Barium Ferrites Doped Rare Earth

Author SunYinFeng
Tutor LiGuoDong
School Inner Mongolia University
Course Condensed Matter Physics
Keywords Rare Earth Elements Sol - gel method . Z-type hexagonal ferrite Y-type hexagonal ferrite Absorbing materials
CLC O482
Type Master's thesis
Year 2007
Downloads 199
Quotes 0
Download Dissertation

Z / Y -type hexagonal ferrite was prepared by the sol - gel method , and tested its structure and microwave absorbing properties of the microwave band . Point of view from the x-ray diffraction spectra of Z / Y -type hexagonal ferrite phase formation temperature . When Z and Y-type hexagonal ferrite sintering temperature of 1300 ℃ and 1050 ℃ microwave absorption properties of the sample . Two hexagonal ferrite doped with different amounts of cerium and lanthanum found its microwave absorption properties change with different amount of rare earth doped and similar changes in the law . The rare earth cerium and lanthanum doping content x = 0.3 , Z - type hexagonal ferrite materials microwave absorption properties of most excellent Z- doped cerium samples , the amount of attenuation is increased by doping before 38.799dB amount of attenuation to 47.575dB; for the Z - type samples doped lanthanum by the doping ago 34.471dB increases to 37.287dB. When x = 0.2 when compared with the undoped microwave absorption properties of the two materials to improve not obvious ; x = 0.1,0.4 when absorbing characteristics of the two samples but declined . Similarly , the Y -type hexagonal ferrite 0.3 Samples of the microwave absorption properties of the most excellent , rare-earth doped cerium doped before 15.71dB increased to 27.567dB doping amount of rare earth doped rare earth lanthanum , the attenuation amount increases to 27.567dB increases 4 dB compared with the undoped . Of cerium and lanthanum doping amount of 0.1, 0.2 when compared with the undoped not significantly improve the microwave absorption properties of the material , some of the band but declined . In order to explore the sample absorbing mechanism , we tested the imaginary part of the dielectric constant of the imaginary part of the sample and permeability . From the experimental results , no obvious rule changes with the addition of rare earth, the dielectric constant of the imaginary part of the sample , but the frequency corresponding to the frequency absorption peak corresponding to the peak of the imaginary part of the permeability is very close , and their peak change with frequency law similar . Therefore , rare earth cerium and lanthanum Z / Y -type hexagonal ferrite magnetic loss to change the rate of absorption of microwave . In short, only doping an appropriate amount of rare earth cerium and lanthanum in order to improve the Z / Y - type hexagonal ferrite microwave absorption properties of doped with a small amount or not conducive to an excessive amount of the rare earth material microwave absorption characteristics improve .

Related Dissertations
More Dissertations