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        Preparation and Characterization of Magnesium Zinc Ferrite Barium Strontium Titanate Composite Materials using Two Stage Sintering

        A. Sutthapintu,A. Rittidech 한국자기학회 2020 Journal of Magnetics Vol.25 No.2

        The effect of two-stage sintering of composition ceramics between (0.6)Mg0.7Zn0.3Fe2O4 and (0.4)Ba0.7Sr0.3TiO3 on crystal structure, microstructure, electrical and magnetic properties was studied. Samples were sintered using a two-stage sintering method with the first sintering temperature (T1) at 1350 ºC with different holding times for 30, 50 and 60 min and cooled down to the second sintering temperature (T2) with sintering temperatures at 900 °C and 1100 oC for 5 h with heating/cooling rate at 10 ºC/min. It was found that the densities and shrinkage values tended to slightly increase with the length of holding times at T1. XRD patterns showed a combination phase between Mg0.7Zn0.3Fe2O4 and Ba0.7Sr0.3TiO3. The crystallize size and lattice strain were calculated from XRD patterns and found to increase with T2 sintering. EDX analysis was used to confirm the elemental composition percentage of (0.6)MZF-(0.4)BST. Examination of the microstructure of composition ceramics with SEM revealed grain sizes in the range of 0.852-1.877 μm; with, square shaped grains corresponding to the Mg0.7Zn0.3Fe2O4 phase and round oval shape corresponding with Ba0.7Sr0.3TiO3 phase. Magnetic behavior and dielectric constant are obviously increased with highly dense ceramics. Finally, the optimal conditions of two stage sintering were obtained for the holding times of T1 about 50-60 min and the second sintering temperature of T2 at 900 °C for 5 h.

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