Frequency Dependence Of Electrical Conductivity Research Articles

Structural, morphological and electrical properties of hydrothermally synthesized cobalt disulfide (CoS2) nanoparticles

Cobalt disulfide (CoS2) is a highly sophisticated metal chalcogenide that has garnered significant attention due to its distinctive properties such as its electrical, optical, catalytic, and magnetic capabilities and potential for use in a range of applications. In this work, pure CoS2 nanoparticles were synthesized using the economical and facile hydrothermal method. The X-Ray diffraction (XRD) method was used to characterize the synthesized sample, confirming that it has a cubic crystal structure with space group P a −3. The Debye-Scherrer’s formula was implemented to determine the average crystallite size of nanoparticles and found to be 24.24 nm. Through the use of Field Emission Scanning Electron Microscopy (FESEM), the morphology and effective grain size of the obtained sample was determined. FTIR spectrophotometry was used to examine the vibrational stretching of the various bonds in CoS2. UV-Vis spectroscopy is employed to measure the optical property of the sample. The optical bandgap calculated from the Tauc Plot is around 1.90 eV reflecting the presence of photovoltaic properties in the sample. The change in dielectric permittivity and loss have been observed for the sample in the frequency range of 100 Hz to 10KHz at different temperatures between 303K and 423K. The frequency-dependent electrical conductivity of CoS2 is also explained. The observations revealed the presence of unique electrical and structural properties in the synthesized sample.

Structural, morphological, magnetic and electrical properties of La0.8Na0.2-x □ x MnO3 (0.00 ≤ x ≤ 0.15) manganites.

La0.8Na0.2-x □ x MnO3 (0.00 ≤ x ≤ 0.15) manganites were successfully synthesized using the solid-state route. X-ray diffraction was performed to check the samples' purity and phase structure. Scanning electron microscopy analysis reveals a decrease in the average grain size with an increase in the deficiency amount. Analysis of the temperature dependence of magnetization proved the presence of ferromagnetic-paramagnetic transition in all the studied samples. The magnetization derivative (d2 M/dT 2) curves demonstrated a decrease in the transition temperature with an increase in the deficiency amount. Such experimental observations can be correlated with bandwidth evolution, which affected double-exchange interactions. It can be equally accounted for by the average grain size decrease. In this regard, the experimental measurements of effective paramagnetic moments revealed the existence of ferromagnetic correlations within the paramagnetic phase. Notably, different electrical findings were addressed. Indeed, the frequency dependence of electrical conductivity displayed the coexistence of two frequency slopes reflecting the presence of Jonscher's double power law for all the studied samples. A significant decrease in conductivity values was observed when the deficiency amount increased. This experimental observation could be assigned to the decrease in the grain size (conductor region). Such assumption was confirmed by the evolution of the grain boundary resistance with deficiency level. Indeed, a significant mounting in the grain boundary resistance values was obtained presenting the increase of the resistive region for x = 0.15. It is worth noting that the Curie temperature for the x = 0.10 sample was found to be close to room temperature (T C = 297 K). These findings make the La0.8Na0.1□0.1MnO3 compound a powerful candidate for many technological applications.

Rare earth Gd3+ substituted on cobalt ferrites: Structural and dielectric studies by citrate gel autocombustion method

Gadolinium-doped cobalt ferrite (CoGdxFe2-xO4; X = 0–0.025 in a 0.005 interval) was synthesised using citrate gel autocombustion. The effect of Gd3+ ions on structural, dielectric, and magnetic characteristics has been investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, ultraviolet visible spectroscopy (UV), an impedance (dielectric) analyzer, and a vibrating sample magnetometer (VSM) were used to characterise the as-synthesised materials. X-ray diffraction powder patterns were used to confirm phase identification and spinel structure, and the Williamson-Hall plot was used to investigate the crystalline size and lattice strain on the peak broadening of each sample, with crystalline size ranging from 13 to 48 nm. The scanning electron microscopy (SEM) micrographs demonstrate particle agglomeration, while energy dispersive spectroscopy (EDAX) pictures indicate the purity and existence of all elements in the created material samples. The frequency-dependent dielectric constant, dielectric loss, and AC electrical conductivity in the frequency range 50 Hz–1 MHz. The behaviour of dielectric properties has been studied using the Maxwell-Wagner model and Koop's theory. Because of this, higher frequencies show less dielectric loss, making them appropriate for use in high-frequency device applications.

Comparison of different inversion strategies for electrical impedance tomography (EIT) measurements

SUMMARY Electrical impedance tomography (EIT) is a promising method to image the frequency-dependent complex electrical conductivity distribution of the subsurface in the mHz to kHz frequency range. In contrast to the well-developed electrical resistivity tomography (ERT) method, the inversion approach for EIT data is less established. Different inversion strategies have been proposed, but the implications of the differences between these methods have not been investigated yet. In this study, we aim to compare four different inversion strategies for EIT measurements. The first strategy (CVI) formulates the inverse problem in the complex number domain and is mathematically the most elegant method. The second strategy (RVI) is the established real-valued inversion method, which decouples the inversion of the real and imaginary parts and completely ignores the complex nature. The third strategy (ALT) is very similar to the RVI strategy in case of small phase angles, but it considers the complex coupling in the forward operator and alternately updates the real and imaginary parts of the model in the case of large phase angles. The fourth and final strategy (CVI+) was newly formulated in this study. It fully considers the complex nature of EIT measurements but separates the treatment of the real and imaginary part in terms of the data weighting and regularization. The different inversion strategies were tested with two synthetic models. The first model has a small phase contrast and the second model has a large phase contrast. In the case of a small phase contrast, the CVI strategy was able to resolve the distribution of electrical conductivity amplitude, but the inversion result for the phase angle was less reliable. The other three strategies presented similar results and the models were well resolved within the expected data misfit. In the case of a model with large phase contrast, only the newly formulated CVI + strategy was able to produce reliable results. It was found that the extremely large phase angle can have a significant influence on the modelled amplitude of data. The cross-sensitivity (i.e. the imaginary part of the sensitivity) that describes the influence on the real part of data due to a change in the imaginary part of model, or that on the imaginary part of data due to a change in the real part of model, provided unique information during the inversion. It was concluded that the CVI + strategy is theoretically the most comprehensive and correct approach for EIT inversion, but that in the case of small phase angles the RVI strategy has the practical advantage that no complex calculations are required, which substantially reduces the required computational effort.

Effect of particle size on electrical impedance, ac conductivity and dielectric properties of ZnSnO3 nanomaterial

In this work, we have reported the electrical impedance, frequency dependent ac conductivity and dielectric properties of zinc stannate (ZnSnO3) nanoparticles synthesized by facile co-precipitation method followed by ball milling for different time span to control particle size. Particle size shows decreasing nature upto a certain span of milling time (2 h) followed by an increase and opposite trend is reflected in band gap. Complex impedance analysis depicts presence of non-Debye type or multiple relaxations and depressed semicircles due to grain and grain boundary. Frequency dependent electrical conductivity analysis shows highest conductivity for two hour milled sample followed by a decrease beyond this. Both real and imaginary component of dielectric constant is also maximum for two hour milled sample.

Temperature and frequency dependent electrical conductivity of Al-Mo co-doped WO3 nanoparticles

Temperature and frequency dependent electrical conductivity of Al-Mo co-doped WO3 nanoparticles

Composition controllable multifunctionality of PVDF/PMMA/BaTiO3/OMMT based ternary and quaternary hybrid polymer nanocomposites

State-of-the-art engineered multifunctional nanocomposites composed of different polymer matrices and functional nanomaterials are in high industrial demand for advances in all-solid-state flexible device technologies. Within this framework, the host matrices of poly(vinylidene fluoride) (PVDF) and its blend with poly(methyl methacrylate) (PMMA), and the barium titanate (BaTiO3) and organo-modified montmorillonite (OMMT) clay mixed nanomaterial dispersed ternary PVDF/x wt% (BaTiO3+OMMT) and quaternary (PVDF+PMMA)/x wt% (BaTiO3+OMMT) hybrid polymer nanocomposites (HPNCs) are prepared through ultrasonicated homogenized solution casting method. The XRD patterns and FTIR transmittance spectra confirmed the composition dependent crystal phases of the PVDF and the heterogeneous polymer-polymer and polymer-nanomaterial interactions in these HPNC materials. The DSC measurements explained a huge alteration in the PVDF crystallite melting temperatures and also the degree of crystallinity of different HPNC materials. The UV–Vis absorbance of these hybrid materials depends strongly on their composition design and demonstrated dual energy band gaps attributed to host polymer matrices and the nanofillers. The dielectric permittivity dispersion in the broadband frequency range of 20 Hz − 1 GHz explains the contribution of several polarizations and relaxation processes in these complex composites, at 27 °C. Appreciably high dielectric permittivity (4 to 7) in the 20 Hz − 1 MHz range and low permittivity at the ultra high radio frequencies confirmed the promising nanodielectric characteristics of these hybrid materials. The interesting structure-property relationship, tunable energy band gaps, a wide range of composition controllable dielectric permittivity, and frequency dependent electrical conductivity revealed the usefulness of these HPNCs in making flexible-type innovative optoelectronic, capacitive energy storage, and microelectronic devices.

Synthesis and characterization of a new cyanato-N cadmium(II) Meso-arylporphyrin complex by X-ray diffraction analysis, IR, UV/vis, 1H MNR spectroscopies and TDDFT calculations, optical and electrical properties

Herein, we have presented a new cadmium(II) pentacoordinate porphyrin complex obtained by the reaction of the [(meso‑tetra(para-methoxyphenyl)porphyrinato]cadmium(II) starting material ([Cd(TMPP)]) with an excess of potassium thiocyanate (KSCN) and crystand-222 (cryst-222) in the dichloromethane solvent leading to the coordination compound with the formula: [K(crypt-222)(H2O)][Cd(TMPP)(NCO)]·2(CH2Cl2)·0.5(C6H14)·H2O (symbolized by complex I). This species was characterized by elemental analysis, UV/Vis, FT-IR, and single crystal X-ray diffraction studies. The intermolecular interactions responsible of the cohesion of the crystal lattice of complex I were investigated using the Hirshfeld surface approach. DFT/TDDFT calculations on complex I were carried out including (i) Molecular structure optimization using the DFT/B3LYP-D3/lanl2dz level of theory, (ii) the frontier molecular orbitals (FMOs) calculations, (iii) the Mulliken charges distribution calculations, (iv) the Molecular electronic potential analysis (MEP), (v) an ab initio UV/Vis and IR calculations and (vi) the QTAIM and NCI-RDG analyses. These latter DFT/B3LYP-D3/lanl2dz calculations studies confirmed, inter alia, the strong hydrogen bond linking the NCO− axial ligand and the water molecule coordinated to the potassium counterion. Furthermore, the electrical conductance and dielectric properties of complex I were investigated shown firstly that the frequency dependence of electrical conductivity, follows the Jonscher's universal dynamic law and secondly that the obtained results have been discussed in terms of the OLPT and NSPT models, which is well adapted to our Cd(II)-porphyrin-NCO semiconductor material.

Dynamics of temperature dependence of the dielectric properties of a nanocomposite material based on linear polyethylene in the vicinity of the percolation transition

Within the frequency range of 30 to 105 Hz and temperatures of 18 to 80 °C, the dielectric properties of linear low-density polyethylene with impurities of flame retardant (20 wt.%) and multilayer carbon nanotubes (1.5 wt.%) were investigated using the oscilloscopic method. This concentration value of carbon nanotubes slightly exceeds the concentration of nanotubes (1%), at which the percolation transition begins for the dependence of the polymer electrical conductivity on the content of nanotubes. It has been shown that the frequency dependence of electrical conductivity can be approximated by two exponential dependences. It has been found that when the sample is cooled, changes in the values of dielectric permittivity and electrical conductivity do not occur in the same way as when heated. The temperature dependences of conductivity for low (102 Hz) and high (104 Hz) frequencies have been obtained.

Effect of size of CdO on bias dependent conduction and relaxation mechanism by means of impedance spectroscopy: Experimental and theoretical studies

In this report, the morphological impact of hydrothermally derived CdO on charge conduction and relaxation is investigated by using bias-dependent impedance spectroscopy (IS). The work of art is the findings of the impact of grain and grain boundaries of CdO on the frequency-dependent electric conductivity and relaxation mechanism followed by the crystallite size. In this regard, two different crystallite size based CdOs are derived from hydrothermal route at different temperatures. Materials are characterized by XRD, FESEM, UV–vis absorption spectra. The dc conductivity is also evaluated by measuring current-voltage characteristics, and bias-dependent Impedance Spectroscopy at room temperature, which spectacles the CdO with larger crystallite size dominate the conduction mechanism.

In-situ study of phase changes in glass by impedance spectroscopy and scaling

Transformation in “evolving glass” in ion-conducting silicate glasses, glass ceramics or ceramics containing an intergranular glass is studied by in-situ impedance spectroscopy and scaling laws. Approaches are developed to scale frequency-dependent electrical conductivity and dielectric properties of multiphase ion-conducting materials to derive temperature-independent information on bulk phases and interfaces in presence. A material's scaled electric conductivity provides a unique response over a range of temperature, if the material remains unaltered, but changes, once modifications in the material occur. Therefore, impedance spectroscopy in combination with scaling can be used for tracking modifications in structure, organization, chemistry and microstructure in “evolving (ion-conducting) glass”.In a first part of this work, our approach is validated through application to stable silicate glasses and glass ceramics. Then “evolving glass” is studied in bulk glasses and ceramics with intergranular glass. Examples include ceramming of glass under formation of a glass ceramic, glass-glass phase separation, modification of intergranular glass in ceramics as result of chemical reactions or melt corrosion.Our approach allows to determine onset of phase separation, nucleation or reaction with high precision. It further reveals that nucleation in our exemplary lithium aluminum silicate glass starts with formation of interfaces (phase separation) prior to forming a well-organized crystal lattice. During phase separation in glass, early capacitive contributions in the impedance spectra indicate that the formation of glass-glass interface precedes the compositional changes in the bulk glass.Impedance of refractories is monitored during thermal treatments or corrosion in glass melt at temperatures up to 1600 °C, and glass characteristics of refractories with glass content as low as 3% are extracted. Conductivity and/or level and/or interconnectivity of the refractory's glass are shown to change during thermal treatments due to reactions between glass and crystalline refractory phases, due to phase transformation or, in case of melt corrosion, due to melt infiltration and ion exchange with the melt.In-situ tracking of impedance and application of scaling laws is shown to be able to reveal changes in bulk glass and intergranular glass.

Synthesis, thermal and dielectric characteristics of Rb<sub>5</sub>Li<sub>1/3</sub>Zr<sub>5/3</sub>(MoO<sub>4</sub>)<sub>6</sub>

This work addressed the directed synthesis of a new phase Rb5Li1/3Zr5/3(MoO4)6, along with the determination of its crystallographic, thermal and electrophysical properties. The directed synthesis of the Rb5Li1/3Zr5/3(MoO4)6 phase was carried out using the solid-state reaction in the temperature range of 350–470 °C. According to differential scanning calorimetry, the synthesised compound Rb5Li1/3Zr5/3(MoO4)6, crystallised in trigonal form (space group R3c, Z = 6), undergoes a diffused first-order phase transition. The structure of triple molybdate Rb5Li1/3Zr5/3(MoO4)6 comprises MoO4 tetrahedra and octahedrally coordinated MO6-polyhedra. This structure is characterised by a statistical distribution of lithium and zirconium atoms in the M position (M1 = 0.790 Zr + 0.210 Li, M2 = 0.877 Zr + 0.123 Li). Rb atoms are located in the large voids of the tetrahedronoctahedral framework. The electrophysical properties of triple molybdate Rb5Li1/3Zr5/3(MoO4)6 having a scaffold structure favourable for ion transport, were studied. The correlation between dielectric and thermal characteristics in the high-temperature region near the phase transition was revealed. The temperature and frequency dependences of electrical conductivity were measured at 473–873 K in heating and cooling modes in the frequency range of 1–10 kHz. The compound exhibited a high thermally activated conductivity, reaching 1.48·10-2 Cm K/cm with activation energy in the range of 0.6–0.8 eV at a temperature of 480 °C. Well-shaped semicircles in the low-frequency region and unresolved arcs in the high-frequency region changing with increasing temperature were observed in the impedance spectra of ceramic Rb5Li1/3Zr5/3(MoO4)6 sample at various temperatures. The evolution of the imaginary part (Z'') as a function of the real part (Z') of the complex impedance resembled that of the complex impedance for compounds having ionic conductivity.

The influence of hybrid decorated structures on the EMI shielding properties of epoxy composites over the X-Band

This work primarily focuses on electromagnetic interference (EMI) shielding characteristics of copper microparticles (CuMP), Fe3O4@CuMP, and Fe3O4 nanoparticles filled epoxy composites across the X-band. The Fe3O4@CuMP hybrids were synthesized through the water-based coprecipitation technique and analyzed by EDS and SEM. The SEM analysis of the hybrids demonstrated an excellent deposition of Fe3O4 particles on the surface of CuMP. The EDS analysis of the hybrids exhibited Cu, Fe, and O elements present in the hybrid powder sample. A set of epoxy composites containing hybrids, CuMP, and Fe3O4 particles were prepared through a resin blending technique, and its electrical and EMI shielding properties were investigated. The 12 wt% CuMP-filled epoxy composites demonstrate a frequency-dependent electrical conductivity value of 3.8 × 10−9 S/cm at 25 Hz. However, the epoxy composites containing Fe3O4@CuMP hybrids did not show a percolated electrical network and exhibited lower conductivity values than the 12 wt% CuMP-filled epoxy composite. Moreover, the hybrid composites exhibited better EMI shielding effectiveness than CuMP-filled epoxy composites containing equivalent filler loading of CuMP (i.e., 12 wt%). The hybrid composite of 1 mm thick filled with 8:12 (wt%/wt%) Fe3O4:CuMP attenuated 83.4 % of EM wave power and exhibited a SET value of 7.9 dB across X-band of 8–12.4 GHz.

Investigation of Wettability and AC-Conductivity of EVA/PANI Composite

In the current work, EVA/PANI composite is successfully prepared by in-situ technique. Both prepared materials are characterized by XRD, FTIR, UV-Visible, and SEM analyses. Wettability and dielectric properties of both EVA film and EVA/PANI composite are studied. High intense peak is found in EVA/PANI composite and is indicated more crystalline nature compared to pristine EVA polymer film. π-π* and polaron transitions are appeared in the UV-Visible spectrum of EVA/PANI composite. Different absorption band of EVA film and EVA/PANI composite are viewed in their spectrum. A study has been made of wettability of smooth surfaces of EVA and HCl doped EVA/PANI materials by observing the equilibrium contact angle formed by a liquid drop resting on the solid surface. Wettability results of EVA/PANI composite shows hydrophilic nature. Frequency dependent AC electrical conductivity and Dielectric are analyzed for both materials.

Investigation of multiferroic properties of dysprosium substituted bismuth ferrite (Bi1-xDyxFeO3) prepared by auto combustion technique

A simple and inexpensive auto combustion procedure was used to create the Bi1-xDyxFeO3 (x=0.0, 0.015, 0.03, 0.045, 0.060) multiferroics samples. In bismuth ferrite, the average crystallite size increased with growing Dy3+ concentration in BFO, revealing a rhombohedral distorted perovskite structure of space group R3c. During morphological analyses of the produced samples, a spherical structure with little aggregation was found. When Dy3+ is substituted at the B-site, the Raman modes widen and the cation site occupancy changes even more. The frequency-dependent dielectric properties (εr, tanδ), electric conductivity (ac), impedance (Z), and electric modulus (M' and M′′) of the samples were assessed using an impedance analyzer at frequencies between 20 Hz and 20 MHz. All samples had the maximum dielectric constant, which was discovered at a relatively low frequency. The highest value of impedance was found at low frequency and it lowers with increasing frequency as a result of the contributions from the grain and grain boundary. It is discovered that the samples' ac conductivity is frequency-dependent and changes depending on how much Dy3+ is doped into the BFO.

Broadband spectral induced polarization for the detection of Permafrost and an approach to ice content estimation – a case study from Yakutia, Russia

Abstract. The reliable detection of subsurface ice using non-destructive geophysical methods is an important objective in permafrost research. The ice content of the frozen ground is an essential parameter for further interpretation, for example in terms of risk analysis and for the description of permafrost carbon feedback by thawing processes. The high-frequency induced polarization method (HFIP) enables the measurement of the frequency-dependent electrical conductivity and permittivity of the subsurface, in a frequency range between 100 Hz and 100 kHz. As the electrical permittivity of ice exhibits a strong characteristic behaviour in this frequency range, HFIP in principle is suitable to estimate ice content. Here, we present methodological advancements of the HFIP method and suggest an explicit procedure for ice content estimation. A new measuring device, the Chameleon-II (Radic Research), was used for the first time. Compared to a previous generation, the new system is equipped with longer cables and higher power, such that we can now achieve larger penetration depths up to 10 m. Moreover, it is equipped with technology to reduce electromagnetic coupling effects which can distort the desired subsurface signal. The second development is a method to estimate ice content quantitatively from five Cole–Cole parameters obtained from spectral two-dimensional inversion results. The method is based on a description of the subsurface as a mixture of two components (matrix and ice) and uses a previously suggested relationship between frequency-dependent electrical permittivity and ice content. In this model, the ice relaxation is considered the dominant process in the frequency range around 10 kHz. Measurements on a permafrost site near Yakutsk, Russia, were carried out to test the entire procedure under real conditions at the field scale. We demonstrate that the spectral signal of ice can clearly be identified even in the raw data and show that the spectral 2-D inversion algorithm is suitable to obtain the multidimensional distribution of electrical parameters. The parameter distribution and the estimated ice content agree reasonably well with previous knowledge of the field site from borehole and geophysical investigations. We conclude that the method is able to provide quantitative ice content estimates and that relationships that have been tested in the laboratory may be applied at the field scale.

Effect of BaTiO3 Doping on the Vibrational Properties of PAni

Due to the advantages of material abundance and synthetic simplicity, polyaniline can be used as a high-capacity cathode material. However, its practical application in batteries has been hindered by poor electrochemical utilization and cycling instability. This paper reports the enhancement in the conductivity of the polymer (PAni) using the oxidation polymerization method. After successfully synthesis of PAni the vibrational properties have been analyzed by using FTIR. From experimental data, it has been observed that after doping of BaTiO3 the carriers along the surface enhanced which increases vibration along with the fingerprint reason. The polymers showed less electrical conductivity than polyaniline. Unlike polyaniline, the presence of the nitro group caused higher frequency dependence of electrical conductivity. The FTIR bands at 1492, 1291 and 1147 cm−1 are corresponding to the polyaniline salt.

Investigation of Grain, Grain Boundary, and Interface Contributions on the Impedance of Ca2FeO5

Conductivity properties such as the impedance contributions of grain, grain boundary, and electrode–material interface of brownmillerite-type Ca2Fe2O5 are studied using alternate current (AC) impedance at different temperatures over a wide range of frequencies. The compound was synthesized at 1000 °C by a solid-state reaction. Powder X-ray diffraction confirmed the pure and single-phase formation. The correlation of the electrical properties with the microstructure of the compound was studied by an AC impedance spectroscopic technique at different temperatures (25–300 °C), which demonstrated the contribution of both the grain (bulk) and grain boundary to the impedance. The frequency-dependent electrical conductivity was used to study the conductivity mechanism. The electric impedance and the frequency at different temperatures supported the suggested conduction mechanism.

Seismoelectric Wave Propagation Simulation by Combining Poro-Viscoelastic Anisotropic Model With Cole–Cole Depression Model

Considering the viscoelastic anisotropy and electrical depression characteristics of the complex geological media, we introduce the generalized standard linear solid (GSLS) model to describe the relaxation effect of the solid skeleton and the Cole-Cole model to describe the frequency dependence of electric conductivity. The seismoelectric model of the poro-viscoelastic anisotropic medium was constructed, and the corresponding wave and diffusion equations in the time domain were derived. We then analyze the characteristics of seismoelectric wavefields in viscoelastic transverse isotropic (TI) media with a homogenous model, a two-layer model and a layered-model with depression. Results show that the TI anisotropy, viscosity of fluid, tilt angle all have significant effects on the propagation of seismoelectric waves in the homogenous model. The strong attenuation of seismoelectric waves in the two-layer model shows the validity of the relaxed skeleton and frequency dependent conductivity used in our approach, which could also effectively capture the reflection and transmission phenomena in the seismic and associated EM fields in the layered model with depression.

Enhanced multiferroics properties of strontium substituted bismuth ferrite prepared by auto combustion method

A low cost and simple auto combustion method was used to prepare the Bi1-xSrxFeO3 (x=0.0, 0.04, 0.08, 0.12, 0.16) multiferroics samples. X-ray diffraction patterns confirms the integration of BFO pure phase nanoparticles with a perovskite structure of ABO3 type having space group R3c. Spherical structure with little agglomeration was observed during the morphological studies of the prepared samples. Sr2+ substituted at the A-site produces expansion in Raman modes and increased variations in cation site occupancy. Impedance analyzer was used to examine the frequency dependent dielectric parameters (ε´, tanδ), electric conductivity (σac), impedance (Z) and electric modulus (Mʹ and M″) of the samples in frequency between 20 Hz and 20 MHz). Maximum value of dielectric constant was observed at very low frequency for x=0.0 samples and it decreases by increasing concentration. Resonance peak was observed in tangent loss for high content of strontium. Maximum value of Impedance was observed at low frequency and it decreases by increasing frequency which is due to the grain and grain boundary contributions. It is observed that ac conductivity of the samples is found to be frequency dependent and it varies with doping of Sr in BFO. Improved polarization was examined in P-E loop of Sr doped BFO nanoparticles.