The pure spinel phase of Ni 0.45 Co 0.2 Zn 0.35 F 2 O 4 [NCZF] was prepared by coprecipitation method. The nanocomposite [(NCZF) 1−x (Na(ac.ac)) x ] (x = 0%, 20%, 40%, 60%, 80%, 100%) was prepared by mixing two phases: ferrite phase and ferroelectric phase. The magnetic characters of composites performed using vibrating sample magnitude (VSM) at room temperature with maximum applied field up to 2 kG. For smaller particle size < 30.89 nm, the coercivity increases rapidly with increasing particle size and reaching maximum value of 99.9 G at 30.89 nm and then decrease with particle size for lager particles >30.89 nm. The saturation magnetization Ms decreases linearly with increasing particle size. The effect of temperature on the electrical resistivity of the different composites samples was studied. It is noted that, the resistivity decreases with rising temperature to have a minimum value at ferroelectric transition temperature, above this value the resistivity increases. The dielectric constant increases with increasing temperature for all composites. The dielectric loss tan (δ) as a function of temperature sharply with temperature reached to maximum value at ferroelectric phase transition then decrease again.
The pure spinel phase of Ni 0.45 Co 0.2 Zn 0.35 F 2 O 4 was prepared by coprecipitation method and ceramic method. The nanocomposite [(NCZF) 1−x (Na(ac.ac)) x ] (x = 0%, 20%, 40%, 60%, 80%, 100%) was prepared by mixing two phases, Ni 0.45 Co 0.2 Zn 0.35 F 2 O 4 with coprecipitation method [NCZF] and sodium acetylacetonate [Na(ac.ac)]. The TEM photographs of the as prepared ferrite samples by coprecipitation method at different ratios of Na(ac.ac) show that the crystalline cubic nanoparticles diameter were ranged from 26 -36 nm and the particle size of Na(ac.ac) is greater than NCZF. The same behavior has also confirmed by XRD patterns indicating polycrystalline nature of prepared sample. The comparison between the SEM micrographs for NCZF nanoparticles prepared by a) ceramic method and b) co-precipitation method was done to show the effect of preparation condition on the microstructure. IR analysis confirms the composites formation.
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