Impedance spectroscopy analysis and structural of Ni0.7Zn0.3Fe2O4 samples synthesis by co-precipitation method at different temperature

In this study, Ni0.7 Zn0.3 Fe2O4 was prepared by chemical deposition at temperatures of 700°C, 800°C, 900°C, 1000°C, 1100°C and 1200°C respectively, The various applications on the spectral and structural analysis of Ni0.7 Zn0.3 Fe2O4 compounds, as observed by X-ray diffraction technique, show that all samples with spherical structure and interstitial intervals have the same Miller coefficients (2.958, 2.517, 2.422, 2.093, 1.717, 1.613, 1.481 and 1.279) nm. Spectral impedance is a tool for understanding the various contributions to electrical properties of semiconductors. Through complex, intricate and complex permutations, the contributions of grains and boundary grains were understood in the electrical characteristics of the samples. The spectral analysis of the impedance as a frequency function (1 kHz-5 MHz) was done for Ni0.7 Zn0.3 Fe2O4 samples. it showed the imaginary part of the reluctance as a function of the complex impedance that shows Debye type of relation time. Cole-Cole plots (relation between real and imaginary parts for impedance complex) showed a nonDebye type of relaxation time of insulation.


Introduction
Ferrites materials are the fifth class of magnetic materials. The basis of these materials is the mixing of different metal oxides with ferric oxide and their main components known as ferrites. Frites are of great technical importance because they exhibit a spontaneous magnetic property under Korean temperature. The requirements of electronic and magnetic properties in advanced electronic and microwave devices have focused the attention of ferrite researchers [1][2][3]. Ferrites are the salts of transition metals, as their contents crystallize on known magnetic elements. The chemical formula of frites can be written as AB 2 O 4 , where A is a binary metal ion-valence, B is Fe 2+ and O is a bivalent oxygen ions. In the spinel structure, oxygen atoms are closely packed in the face-centered networks in the joints where the metal ions are distributed. This type of material possesses a momentary visuals and an imbalance between the two spins produced by the magnetic interaction of ants [4][5]. The technological applications of ferrite is its use in high frequency transformers and pulse, induction, coil deflection and applications in high permeability and low loss at high frequencies [6][7]. To study the effect of different temperature on structural analysis, the insulating and magnetic properties of Ni-Zn ferrites prepared a combustion reaction studied by K. Ramakrishna et al [8]. Application of complex spectroscopy analysis technique, results show Get it one half circular shape at each temperature over the measurement range, meaning that the electrical process responds to a single relaxation mechanism. The impedance and related coefficients of the electrical equivalent circuit depend on the temperature and microscopic structure of the samples. Constant isolation and loss of isolation of the probe samples are dominated by the conduction and relaxation processes associated with the grain boundary mechanism [10]. Complex resistance and dielectric properties of Mg 0.5 Zn 0.5 Fe 2 O 4 ferrite was measured in the frequency range (13)(14)(15) at several temperatures within the limits (0-100 o C) and complex -complex resistance spectra indicating that the material could be represented by a For a two-layer leak capacitor that corresponds to bulk phenomena and granular boundaries at high and low frequencies respectively, and a string resistance of approximately the same value is observed at all temperatures. This resistance is believed to be due to external connections and electrodes. The capacitive element depends on the frequency and the insulation results are discussed The true ε' r insulation and loss of ε' r insulation at low frequencies is attributed to interstitial polarization, at high frequencies Deby as the relaxation of the directed polarization is dominant. It discusses the adoption of resistance and insulating properties at temperature and frequency [10][11]. Spectral impedance is applied to investigate the attenuation of the sample electrical insulation at a temperature range of 323 to 473 K and at a frequency range of 42 Hz to 1.1 MHZ. The complex impedance -impedance plot was analyzed by an equivalent circuit consisting of two connected R-cup units, each containing R (R) and constant phase (K). The Cole-Cole model is used to investigate the mechanism of buffer relaxation in the sample. Frequency-dependent conductivity spectrums obey the energy law [12]. Today the nano-ferrite scale has attracted a large number of researchers because of

Structural Analysis by X-ray Diffraction Technique:
XRD patterns of Ni 0.7 Zn 0.3 Fe 2 O 4 samples were obtained using X-ray diffractometer technique (model Bruker D8 Advance) with CuKα radiation (λ=1.5418 Å). The patterns were characterized by using for Ni-ferrite and Zn-ferrite. The average size of the crystals was determined from the width of the maximum diffraction limits using the Deby-Schichter formula [13].
where k = 0.89 (assuming the particles are spherical in shape); λ = wavelength of X-ray diffraction; β = full width at half maximum ( FWHM ) OF the diffraction peak; and θ = angle of diffraction.
Assuming that all the particles to be spherical, the specific surface area of particles was calculated by relationship [14]. Where S = the specific surface area of particles, d = the diameter of the crystallite in nm and ρ = the density of the particle in g cm −3 .

Dielectric measurements:
Using two methods of investigation, the insulating measurements of the samples, namely

Impedance spectroscopy analysis:
Electrolysis Using the S-spectrum spectrum technique, electrical behavior An electrical response of the samples can be analyzed via complex dielectric modulus formalism M*(ω), which is an attractive approach based on polarization analysis.    [20].   The difference of shadow loss (tanδ) with frequency at room temperature is shown in Fig.   (4). Contrast is similar to change Increase in frequency and temperature. This also indicates a single relaxation process in Fig. (5) showing the variation in the real portion of the resistance (Z') with frequency at different temperatures. As can be seen, the  Fig. (5) shows the difference in the imaginary part of Z resistance with frequency at different temperatures. Peak in Z" turns to low frequencies with increased temperature indicating a lower relaxation in the system. Relaxation times are calculated from the frequency at which Maxima is observed. The maximum limit is found to increase with the temperature indicating a loss increase in the sample [22][23].   mobility of the carrier's shipments, as well as that electrolysis makes a small contribution in the material [24]. In the conduction process, the holes contribute smaller than those electrons because of their low mobility. The electron between the iron Fe 2+ and Fe 3+ ions, leading to the local transition in the direction of the extruded electrode field (while the exchange of the hole between Ni 3+ and Ni 2+ , causes electrostatic polarization in the ferrite [25]. However, exchanges between Ni 2+ and Fe 3+ can also be found. However, Fe 2+ ⇔ Fe 3+ is the easiest and therefore their number will be reflected in a fixed dielectric value, and the results of Fig. (7) indicate that this figure should be the same for all measurements The forms of the spectral pieces obtained at different temperatures are still the same Thus, the distribution of relaxation time is independent of the temperature Fig. (8) shows the dependence on M' frequencies at different temperature values. It is observed from the figure that the increase with M increases with frequency increase except for the emergence of a small and wide band that turns out to be high frequency side-by-side with an increase in the temperature. cm area of the frequency below the peak. The maximum limit determines the range of charge carriers due to long-range jump. At frequencies above the maximum peak (upper frequency), the carriers are limited to potential wells and are traveling at a short distance [24]. Similar explanation in case CuFe 2 O 4 by Sakia Shaikh et. al. [25].

Conclusions
Samples Ni 0.7 Zn 0.3 Fe 2 O 4 showing the structure of the spinel and cube (311) peak is more intense. The intensity of peak samples varies with different temperature particle size, the Analysis of electrical and inertial data by complex complex impedance (Z*) and buffer coefficient (M*) provides more ideas in the behavior of materials, information on grain and grain contribution input resistance and amplitude of electricity properties of samples.