Dissertation
Dissertation > Industrial Technology > Electrotechnical > Electrical materials > Magnetic materials,ferrite > Ferrite,oxide magnetic materials

High-performance Ni-Zn ferrite Preparation and Properties

Author LiJianDe
Tutor LuoGuangSheng
School Nanchang University
Course Materials Physics and Chemistry
Keywords Ni-Zn ferrite Permittivity Dielectric loss tangent Saturation magnetization
CLC TM277
Type Master's thesis
Year 2010
Downloads 99
Quotes 0
Download Dissertation

As information technology and electronic digital product development, the development of devices tend to be small, broadband, high-performance and low-loss, which is soft Ni-Zn ferrite material put forward higher requirements. This paper was prepared by a conventional process of preparing a ceramic high-performance Ni-Zn ferrite, and the effects of different calcining temperature, different sintering temperatures, different Ni2 content, as well as La3, Nd3, Cu2 various ion doping on Ni- Zn ferrite structure and magnetic properties. The results showed that: (a) for different calcining temperature and the sintering temperature Ni0.5Zn0.5Fe2O4 ferrite structure and properties were studied, the results showed that: 950 ℃ and 1000 ℃ calcined samples with Fe2O3 second phase generator With calcination temperature the crystal lattice constant decreases, the crystallite size increases. As the sintering temperature lattice parameters first increases and then decreases, while the crystallite size and density increases; permittivity first decreased and then increased, when there is minimal at 1200 ℃ value; resistivity change is the first increase and then decrease. 1300 ℃ sintered samples have a dielectric loss tangent peak, exhibit an abnormal behavior of the dielectric. (2) of different ion content Ni2 NixZn1-xFe204 (x = 0.3-0.7) the structure and properties of the ferrite results show that: with the increasing content of Ni2 lattice constants, density and showed a reduced dielectric constant trend, showing a tendency to increase the crystallite size, the saturation magnetization increases first and then decreases, at a maximum when x = 0.5 80.23emu / g. Apart Ni0.3Zn0.7Fe2O4 dielectric loss tangent normal variation, the other samples were the dielectric loss tangent of dielectric exhibit abnormal behavior, with a peak appears. (3) study the La3 doped Ni0.5Zn0.5LaxFe2-xO4 (x = 0.002-0.010) ferrite structure and performance, the results showed that: Ni0.5Zn0.5La0.008Fe1.992O4 and Ni0.5Zn0.5La0. 01Fe1.99O4 ferrite samples have LaFeO3 second phase appears. With the increase in the amount La3 doping, lattice constant, crystallite size and permittivity are first increases and then decreases, and when you are in the x = 0.006 peak, but showed a tendency to increase the density; resistivity and saturation magnetization decreases and then increases, both in the x = 0.006 when the minimum value. Apart Ni0.5Zn0.5La0.002Fe1.998O4 samples, the other samples are the dielectric loss tangent peak, dielectric exhibit abnormal behavior. (4) doped with Nd3 studied Ni0.5Zn0.5NdxFe2-xO4 (x = 0.002-0.010) ferrite structure and performance, the results showed that: Ni0.5Zn0.5Nd0.01Fe1.99O4 ferrite samples of a NdFeO3 two-phase formation. With Nd3 doping increases, the lattice constants show an increasing trend, density, dielectric constant and dielectric loss tangent first increases and then decreases, both in the x = 0.008 to a maximum value; while decreases the saturation magnetization, when the x = 0.010 min 71.22emu / g; and all samples were a dielectric loss tangent peak, the performance of the dielectric abnormal behavior. (5) of Cu2 doped Ni0.5-xCux Zn0.5Fe2O4 (x = 0.12-0.28) ferrite structure and performance, the results showed that: x = 0.24 and 0.28 of the sample with a second phase generated CuO and CuFe2O4 . With Cu2 doping increases, the lattice constant showed a decreasing trend, showing a tendency to increase the crystallite size, density first increases and then decreases at x = 0.20 obtained when the maximum 5.30g/cm3; permittivity and dielectric loss tangent first decreased and then increased, both in the x = 0.20 obtained when the minimum; resistivity and saturation magnetization first increases and then decreases, both in the x = 0.20 to a maximum value, but x gt; 0.24 when the saturation magnetization and showed an increasing trend. x = 0.28 dielectric loss tangent with the peak appears, the dielectric performance of abnormal behavior.

Related Dissertations
More Dissertations