In the present work, the effects of calcination and sintering conditions on the permeability and loss of $Mn_{0.54}Zn_{0.4}Fe_{2.06}O_4$ were studied using specimens calcined 900˚-1100˚ for 3 hours in air and at 950℃ in $N_2$ and then sintered at 1200˚-1275℃ for 3 hours in atmosphere of 5% $O_2$, 95% $N_2$.
The composition was chosen to have nearly zero magnetocrystalline anisotropy constant $K_1$ and small magnetostriction constant $λ_s$ at room temperature.
At constant sintering temperature, permeability showed high values in calcination temperature range of 950˚-1100℃ and at constant calcination temperature, permeability slowly increased with increasing sintering temperature up to 1250℃ and then decreased.
Loss factor showed higher values at higher calcination and sintering temperature.
The variation of permeability and loss were discussed in terms of pore and discontinuous grain growth.
Schematic contour diagram of permeability and μQ product related to calcination and sintering temperature have been constructed.
In this diagram, the temperature region of maximum μQ product was shifted to lower temperature compared to maximum permeability.
