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ANALYSIS OF STRUCTURAL, AND DIELECTRIC PROPERTIES OF ALZNTIO3 AND ALZNNITIO3 NANOPARTICLES

ABSTRACT

Using the solid-state process, powdered ZnO and TiO2 were combined in a 1:1 molar ratio to produce ZnTiO3. Dielectric parameters like dielectric constant (r) and dielectric loss (tan ) have been investigated between 200 Hz and 5 MHz throughout a temperature range of 40oC to 400oC in 10oC increments. The high dielectric constant of 50 found may be useful in capacitors that store large amounts of charge. FTIR and UV-Vis Spectra were also used to investigate the optical characteristics. UV-Visible Spectra were used to determine the band gap. X-ray diffraction patterns showed a change in phase from tetragonal to cubic as x increased from 0.2 to 0.4 to 0.8. Nanosphere-like features were seen in the surface morphology. For 1 MHz samples with x = 0.2-0.6, the dielectric constant was raised from 230 to 710, respectively. Dielectric constant (ε’) = ~-58.5 and dielectric loss (ε’") = -417 at 8 MHz were observed in the x = 0.6 nanocomposite, which was an unexpected finding. Similarly, at 6 GHz, the ac-electrical conductivity (ac) of the x = 0.6 sample was -0.159 S/cm. As a result, high-capacity stored-charge capacitors and excellent absorber applications are possible with these materials. Materials that combine magnetic and dielectric characteristics into a single entity are known as magneto-dielectric composites. Because of the interaction between the electric and magnetic fields, the electric polarization may be manipulated by adding a magnetic field, and vice versa for ferroelectric materials. Composites’ magneto-dielectric characteristics can be altered significantly by manipulations of phase connectivity and phase morphology. The synthesis technique is a powerful tool for investigating the composites’ magneto-dielectric characteristics and microstructure. In this study, we utilize three different synthesis techniques to make magneto-dielectric composites. Both in-situ synthesis and solid-state mixing may be traced back to combustion. For its intermediate permittivity, loss, and piezoelectric constant, BaTiO3 was chosen for the ferroelectric phase. For the ferrite phase, we use materials that are hard (CoFe2O4), soft (ZnFe2O4), and non-magnetic (Co0.5Zn0.5Fe2O4). Magneto-dielectric composites with varying percentages of ferrite (20%, 30%, 40%) were employed. Composites were investigated for their structure, microstructure, and magneto-dielectric characteristics. The composites’ dielectric, magnetic, and magneto-dielctric characteristics were shown to be highly method-dependent. When tetragonal BaTiO3 was sintered with ferrites, traces of hexagonal BaTiO3 were found. BaTiO3 grew into a plate-like morphology alongside a nearly spherical shape in composites obtained from the solid state, but there was no indication of plate-like BaTiO3 in composites formed in situ. Both solid-state and in-situ synthesized composites based on cobalt ferrite exhibit a negative magneto-capacitance response, which is not seen in other ferrite systems.

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