Effect of sintering on some properties of NiZn-ferrite

Mohanty, Debajyoti (2011) Effect of sintering on some properties of NiZn-ferrite. BTech thesis.



The present investigation reports effect of densification on the magnetic properties (initial permeability and relative loss factor) of Ni–Zn ferrites with a composition (Ni0.68Zn0.25Mn0.02)Fe2.5O4.
NiZn-ferrite toroid samples of the above composition, supplied by one industry, were sintered at three temperatures; 1000˚C, 1050˚C and 1100˚C and for three different periods of 15 mins, 1 hr and 4 hrs.The X-ray diffraction pattern confirms the formation of cubic spinel phase.
In the above samples, the highest densification achieved was 84.71 % (of theoretical density) at 1100oC 4hrs. The sintering temperature was kept low to minimize the ZnO evaporation loss.
Magnetic measurements were performed at 100 KHz (0.01 V) using a LCR meter and showed a maximum inductance of 3.9501 µH. The highest initial permeability was 67.83 and the relative loss factor varied from 0.0143 to 0.00178 i.e. in between the range 10-2 to 10-3.
Also, the dependency of permeability and loss were measured in the range of 42 Hz to 1 MHz. A decrease in initial permeability was observed with increasing frequency. Better magnetic properties (at high frequencies) have been noted in the samples with higher densities.

Item Type:Thesis (BTech)
Uncontrolled Keywords:LCR, RLF
Subjects:Engineering and Technology > Ceramic Engnieering > Ceramic Materials
Divisions: Engineering and Technology > Department of Ceramic Engineering
ID Code:2188
Deposited By:DJ Mohanty
Deposited On:12 May 2011 17:30
Last Modified:12 May 2011 17:30
Supervisor(s):Bera, J

Repository Staff Only: item control page