Substituted Barium Hexaferrite Research Articles

Strong magnetoelectric coupling in novel Na0.5Bi0.5TiO3–BaFe12-2xCoxTixO19 multiferroic composite

Multiferroic composites of sol-gel synthesized Sodium Bismuth Titanate (Na0.5Bi0.5TiO3) and Co–Ti substituted Barium Hexaferrite (BaFe12-2xCoxTixO19; x = 0.0, 0.5, 1.0, 1.5 and 2.0) in the ratio 3:1 was synthesized through ceramic route. Successful formation of R3c rhombohedral and P63/mmc hexagonal phases corresponding to Na0.5Bi0.5TiO3 and BaFe12-2xCoxTixO19 respectively was confirmed from the XRD and Rietveld refinement pattern. The frequency and temperature dependence of dielectric constant and loss of the composite systems exhibited typical dispersion behaviour which could be understood using the Maxwell-Wagner model. Substituted samples showed enhanced dielectric behaviour where dielectric constant was observed to increase while loss tangent decreased. Using the Universal Jonscher's Power law (JPL), conductivition mechanisms of the composite systems were studied from the ac conductivity behaviour which revealed that the x = 0.0 sample followed Non-overlapping Small Polaron Tunnelling (NSPT) model while the remaining samples followed the Correlated Barrier Hopping (CBH) model. The complex impedance and Nyquist plot analysis showed the enhancement of resistive property in the x≠0 systems. Magnetic hysteresis loop measurements were conducted, and the associated parameters were determined with the assistance of the Law of Approach to Saturation (LAS). Favourable reduction in the magnetic anisotropy was observed indicating the disturbance of magnetic spin structure in the hexaferrite phase. The P-E loops established the novel room temperature multiferroic nature of the composite systems. Significant magnetoelectric coupling was detected at room temperature in all samples, with the x = 0.5 sample exhibiting the highest value of approximately 59.81 mV/cmOe. These desirable properties suggest that the composites may find future device applications as in magnetically tunable energy harvesting devices and self-powered magnetoelectric sensors in the future.

Synthesis, thermal X-ray, neutron diffraction, Mössbauer spectroscopy and magnetic properties investigation of Al doped barium hexaferrite BaFe11AlO19

Polycrystalline aluminum substituted barium hexaferrite BaFe11AlO19 synthesized by the ceramic technique. The results of energy dispersive X-ray analysis, thermal X-ray diffraction (XRD), neutron diffraction, Mössbauer spectroscopy, magnet properties measurements were measured. XRD analysis demonstrated P63/mmc hexagonal structure of BaFe11AlO19. The magnetic sublattice of barium hexaferrite BaFe11AlO19 was obtained using neutron diffraction data. The distribution of aluminum in barium hexaferrite matrix at positions 2a and 12k was obtained with Mössbauer spectroscopy. A comparison of the calculated intensities of the neutronograms and the actual ones allowed us to establish that in position 2a the aluminum ion occupied a position with the coordinate (1;1;0), and the position of the substituent ion in position 12k (0.83333; 0.66667; 0.10810). According to neutron diffraction data, it was found that the actual Curie temperature is lower than that measured by differential scanning calorimetry.

Improved magnetoelectric coupling of Co–Ti substituted barium hexaferrite at room temperature and related electrical investigations

This paper reports a systematic study of the electrical, multiferroic and magnetoelectric coupling properties of Co–Ti substituted Barium hexaferrites, having the chemical composition BaFe12-2xCoxTixO19 (x = 0–2.0; in steps of 0.5), synthesized using the sol gel auto-combustion method. X-ray Diffraction (XRD) studies and Rietveld refinement confirmed the successful incorporation of Co–Ti ions in the hexaferrite lattice with all the samples displaying Pb63/mmc space group single phase structure. Scanning Electron Microscope (SEM) images revealed the inhibition of crystal growth in a particular direction with Co–Ti substitution. The conduction mechanisms of the samples were analysed from the conductivity measurements and were found to follow Jonschers power law. The complex impedance spectroscopy analysis and the Cole-Cole plot fitted diagrams of the samples indicated the enhancement of bulk resistivity and grain boundary resistivity with substitution. Saturation magnetizations of the substituted samples decreased and were ascribed to the replacement of Fe ions by Co–Ti ions at different crystallographic sites. The observed reduction in anisotropy constant indicated the disturbance in the magnetic axis. The multiferroic nature of the substituted samples at room temperature was confirmed from the soft ferroelectric loops. Room temperature magnetoelectric coupling coefficient was found to be largely enhanced with substitution, achieving an exceptionally high value of 182mV/cmOe for the x = 1.5 sample. This may prove useful for potential use in emerging device applications as a single phase room temperature multiferroic material.

Exploring the structural and electrical trends in Mo2+ substituted Ba0.7Gd0.3MoxF12-xO19 Hexaferrite

The investigation of structural and electrical properties of Ba0.7Gd0.3MoxF12-xO19 for x = 0.02, 0.04, 0.06, and 0.08 were synthesized using a solid-state reaction method. Dielectric study and different impedance parameters were measured at temperature ranging from room temperature (RT) to 500 °C and frequencies ranging from 20Hz to 20 MHz. XRD study confirms the presence of hexagonal P63/mmc phases. Average crystallite size of Ba0.7Gd0.3MoxF12-xO19 for x = 0.02, 0.04, 0.06, and 0.08 were found as 42.177 nm, 42.550 nm, 48.026 nm, and 55.057 nm respectively. Dielectric constant of the sample decreases (at a specific frequency) when the Mo2+ concentration increases. Two transition peaks were observed in the dielectric plot with the temperature variation, indicating multiple electrical transitions in Mo2+ substituted barium hexaferrite. The existence of one semicircle in the Nyquist plot indicates the presence of grain effect in all ceramic samples.

Investigations on structural, Mossbauer, dielectric, and ferroelectric properties of La doped barium hexaferrite

La substituted Barium hexaferrite, Ba(1-x)La(x)Fe12O19, (x = 0, 0.1, 0.15, 0.20) was synthesized using ball milling followed by heat treatment. Rietveld analysis of X-Ray diffraction patterns reveals the formation of a single-phase magnetoplumbite structure of barium hexaferrite for all prepared samples. Morphological studies using FESEM shows the formation of hexagonal plate-like grains with different grain size, and the average grain size decreases with La doping. Elemental analysis using EDS confirms that the observed elemental composition for all the samples is within the expected range within the experimental error. Density measurements observed that porosity decreases up to La content x = 0.15 and then slightly increases for x = 0.20. Mössbauer spectroscopy studies reveal no formation of Fe2+ ions but delocalization of electrons after La doping. There is not much variation in the hyperfine structure with La doping. It is observed from the dielectric spectroscopy that the highest dielectric constant and low loss are observed for La content x = 0.20. The P-E loop of the pristine sample shows small polarisation but leaky behavior, whereas La substitution shows both leaky and resistor circuit-type behavior but large polarization.

Enhanced X-band absorption and shielding performance of Gd-substituted barium hexaferrite

Gd- substituted barium hexaferrite has been synthesized by solid-state ceramic method to explore its X-band (8.2 – 12.4 GHz) absorption and shielding performance. The structural, magnetic, and microwave properties of the synthesized hexaferrite were studied by X-ray diffraction (XRD), micro-Raman spectroscopy, field emission scanning electron microscopy (FESEM), vibrating sample magnetometer (VSM), and vector network analyzer (VNA). XRD patterns confirmed the hexagonal magnetoplumbite phase formation in all samples. A noticeable red shift in the Raman spectra from 710 to 705 cm-1 and 323–327 cm-1 suggested the presence of Fe2+ ions at 4f1 tetrahedral and 12k octahedral sites, respectively. Microstructural studies on as-prepared samples confirm particle size reduction up to 1.86 µm with Gd substitution. A modest increase in magnetization and remanence value for 20% Gd was noted. Coercivity increased with substitution, whereas the anisotropy field and crystalline anisotropy constant reduced with Gd addition. An overall improvement in shielding efficiency and absorption was noted for Gd- substituted samples. A maximum average shielding efficiency of 16.47 dB and effective absorption of 99.99% was recorded for 10% Gd. Overall, microwave absorbance is improved up to 97% with Gd substitution, which suggests this material can also work as an absorber in microwave device applications.

Effect of La substitution on the structural and chemical properties of Barium hexaferrite via Mossbauer spectroscopy

M-type Barium hexaferrite is a famous hard magnetic material with a hexagonal crystal structure. La substituted Barium hexaferrite, Ba(1-x)La(x)Fe12O19, (where, x = 0.25 and 0.30) were synthesized using ball milling followed by sintering at 1300 °C for 5 hours. X-ray diffraction patterns reveal the formation of a single-phase magnetoplumbite structure of barium hexaferrite, which belongs to the P63/mmc space group. Mossbauer spectroscopic studies were carried out to study the magnetic phase, the effect of La doping on the valency of the Fe atom, and charge distribution in the prepared samples. Mossbauer spectra is fitted using 5 sextets, shows there is 5 sublattices present in the system. From the fitting of Mossbauer spectrum, it is observed that, there is no formation of Fe2+ ion even if the doping levels are as high as 30%, as it is expected that Fe3+ ion changes its valance to maintain the charge neutrality. However, there is an increase in s-electron density for number of sites with doping. Quadrupole splitting values shows spherical charge distribution for all the sublattices except 2b, due to asymmetric nature of bipyramidal site. Slightly varied magnetic hyperfine splitting values are observed for 12 k and 4f1 sites shows the effect of La substitution.

Structural, magnetic, and biocompatibility evaluations of chromium substituted barium hexaferrite (Co2–Y) for hyperthermia application

In the present work, chromium-substituted cobalt-based Y-type barium hexaferrite ceramics having a general formula of Ba2Co2Fe12-xCrxO22 (0.0 ≤ x ≤ 0.5) have been studied to evaluate its potential candidacy as an optional replacement for various soft ferrite materials in the field of magnetic hyperthermia. The as-obtained ferrite powders are characterized for structural, magnetic, and morphological properties after being calcined at 1200 °C for 2 h. The structural parameters confirm single-phase nanocrystalline Y-type barium hexaferrite formation within all the samples. The room temperature magnetic parameter, i.e., saturation magnetization (Ms), is found to decrease (from 39.07 to 33.50 emu/g), and the coercive field (Hc) is increased (86.87–281.84 Oe) consistently. Later, oleic acid-coated ferrite samples' heating capability is governed within the applied AC magnetic field (25 mT at a frequency of 114.1 kHz) in terms of specific absorption rate (SAR) using time-dependent temperature performance. The superiority of the sample having the greatest SAR value (84.39 w/g for Ba2Co2Fe11.7Cr0.3O22) is interrelated with the particles' geometry, size distribution, magnetic parameters, and surface chemistry obtained from the XPS analysis. This sample is further analyzed for its biocompatibility performance against the MG-63 cell line; the results indicate that it may be a potential candidate for magnetic hyperthermia due to its significant SAR & ILP value along with better biocompatibility.

Electrical, dielectric and magnetic properties of Mn2+ substitution in barium hexaferrites nanoparticles

Hexagonal barium ferrite (BaFe12O19), known as M−type barium hexaferrite (BaM), iscommonly used as permanent magnets, particulate media for magnetic recording as well as in microwave devices. The present paper deals with the synthesis of manganese substituted barium hexaferrite with generic formula Ba1-xMnxFe12O19 (x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) using sol–gel auto combustion method. Citric acid products used as a chelating agent and used in a ratio of 1:3 in accordance with the chemical approach to fuel. The powder thus prepared was annealed at 950 °C for 12 h to remove impurities and moisture. The DC electrical resistance decreases with increasing temperature and also with the concentration of Mn2+. The high value of the resistivity of the present samples leads to semiconductor behaviour. The activation energy and drift mobility also decrease with Mn2+ substitution. The dielectric behaviour of the presented samples is similar to the behaviour reported in the literature. The dielectric constant, dielectric loss, and dielectric loss tangent decrease with increasing frequency. With Mn2 + substitution, the dielectric parameters decrease. The magnetic properties of pure and Mn-substituted hexagonal ferrite are consistent with literature results. The saturation magnetization decreases with increasing substitution x.

Electromagnetic properties in the structure of Cerium-Copper substituted barium hexaferrite

In this study Ce3+-Cu2+ doped barium hexaferrite Ba0.5Ce0.5CuFe11O19 composite sample was synthesized by a conventional method and barium hexaferrites/CeO2 phase composition, X-Ray Diffractometer were examined. Sample morphology was observed by SEM. A VSM was used to analyze the magnetic properties of the ferrites. Complex permittivity, permeability, reflection loss, absorption loss and shielding effectiveness were analyzed by using a VNA measuring the transmission/reflection coaxial airline method. The phase changes of the crystal structure because of the effect of Ce3+ ions into Ba2+ site and Cu2+ ions into Fe3+ areas were investigated. The resulting composition in these two resonance phases has a maximum absorption loss value at ∼6.48 GHz and ∼11.25 GHz and a maximum reflection loss value at the same frequencies. In this synthesized composition structure, it has been observed that it has a maximum reflection loss value of approximately –22.2dB and the highest shielding effectiveness value of 33.3 dB at microwave frequency 11.25 GHz.

Transition Metal Substituted Barium Hexaferrite-Modified Electrode: Application as Electrochemical Sensor of Acetaminophen.

This study used substituted barium hexaferrites, which were previously prepared and reported by the authors, to detect acetaminophen by the modification of a conventional glassy carbon electrode (GCE), which led to promising results. The synthesis of this electrode-modifying material was conducted using a citrate sol gel process. A test synthesis using glycerin and propylene glycol revealed that glycerin produced a better result, while less positive anodic potential values were associated with the electrooxidation of N-acetyl-p-aminophenol (NAP). Excellent electroactivity was exhibited by the cobalt-substituted barium-hexaferrite-nanomaterial-modified electrode. A good linear relationship between the concentration and the current response of acetaminophen (paracetamol) was obtained with a detection limit of (0.255 ± 0.005) µM for the Ba1.0Co1.22Fe11.41O18.11 GCE, (0.577 ± 0.007) µM for the Ba1.14Cu0.82Fe11.65O18.02 GCE, and (0.595 ± 0.008) µM for the bare GCE. The levels of NAP in a real sample of urine were quantitatively analyzed using the proposed method, with recovery ranges from 96.6% to 101.0% and 93.9% to 98.4% for the modified electrode with Cobalt-substituted barium hexaferrites (CoFM) and Copper-substituted barium hexaferrites (CuFM), respectively. These results confirm the high electrochemical activity of Ba1.0Co1.22Fe11.41O18.11 nanoparticles and thus their potential for use in the development of sensing devices for substances of pharmaceutical interest, such as acetaminophen (NAP).

Analysis of electromagnetic properties of Ce–Zn substituted barium hexaferrite for electronic circuit applications

Electromagnetic properties of Ce–Zn substituted barium hexaferrite (Ba0.5Ce0.5ZnFe11O19 ferrite) synthesized using ceramic technique were analyzed in detail in the X band frequencies to describe its response to microwave absorber and microwave electronic device applications. The phase formations, structural morphology, polarization mechanisms and magnetic properties for Ba0.5Ce0.5ZnFe11O19 ferrite, which provide important information about electrical load transmission mechanism were analyzed using X-ray diffraction, scanning electron microscopy, two-port vector network analyser and vibrating sample magnetometer techniques, respectively. The experimental complex dielectric plane plots (Cole-Cole plots) of the Ba0.5Ce0.5ZnFe11O19 ferrite represent an equivalent RC circuit corresponding to the impedance circuit in the Smith Chart. The reflection loss increased to the highest value (−17.04 dB) depending on the amount of Ce in the structure of the Ba0.5Ce0.5ZnFe11O19 ferrite and the bandwidth, which is important for microwave absorbers, increases.

Zn and Mn doped Ba1-xZnxFe12-yMnyO19 as highly photoactive under visible light with enhanced electrochemical and dielectric properties

The zinc and manganese substituted barium hexaferrite (Ba1-xZnxFe12-yMnyO19) nanoparticles (0.00 < x < 0.90; 0.00 < y < 0.75) was fabricated by microemulsion approach and effect of substitution was evaluated on the basis of electrochemical, dielectric and photocatalytic properties. The Ba1-xZnxFe12-yMnyO19 NPs exhibited ferrite structure with hexagonal phase having P63/mmc space group and the crystallite size was in 16–21 nm range. The microstructure of Ba1-xZnxFe12-yMnyO19 NPs showed the agglomerated spherical structure. The effect of doping on the electrochemical property of the fabricated material was investigated via cyclic voltammetry. The energy band gap was estimated from UV–visible absorbance spectra using Tauc plots, band gap values show a decreasing trend by increasing the dopant contents, i.e., 1.89 (eV) to 1.31 (eV) for doped samples. The low band gap value material has promising potential in optical and catalytic applications. Dielectric constant and dielectric loss of Ba1-xZnxFe12-yMnyO19 NPs were monitored in 20 Hz to 0.017 GHz range. By increasing the dopants content, tangent loss and dielectric loss were increased, while the AC conductivity was decreased. Moreover, photocatalytic efficiency was investigated by degrading methyl green (MG) dye under visible light irradiation and it was found that the substituted NPs exhibited maximum degradation of 85.1% of MG dye following the first order kinetic with rate constant of 0.0188 min−1. The results depict that the properties of BaFe12O19 can be tuned by Zn and Mn doping for potential application in photocatalysis.

Structural, morphological, dielectric and magnetic properties of Ba1−xCrxFe12O19 M type hexaferrites

Chromium doped M-type hexaferrites having composition Ba1−xCrxFe12O19 at x = (0.0,0.1,0.2,0.3,0.4,0.5) were fabricated by sol-gel auto combustion technique. XRD technique was performed to confirm the phase formation. Morphology of the prepared samples was analyzed through scanning electron microscopy (SEM) and it indicated the hexagonal platelet structure. Lattice parameters, crystallite size and cell volume were found to decrease with the increase of doping (Cr3+) concentration. Saturation magnetization and magneto crystalline anisotropy has been investigated through law of approach to the saturation magnetization. Saturation magnetization first increases and reaches to maximum at x = 0.3 for Cr3+ substituted Barium hexaferrite. Dielectric constant, dielectric loss tangent loss, ac conductivity and Q values of the prepared samples were also discussed. Dielectric constant increases gradually with increasing dopant (Cr3+) concentration. These parameters were found to be appropriate for high frequency applications such as modulators, phase shifter and also in magnetic recording media.

Computational and experimental study on cation distribution of Cobalt substituted barium hexaferrites BaFe12−xCoxO19 (x = 0, 0.3, 0.6, 0.9) for circulator applications

The anisotropic BaFe12−xCoxO19 (x = 0, 0.3, 0.6, 0.9) (BFCO) samples were synthesized. We investigated the crystal structure, microstructure, and magnetic properties of BFCO. And the potential application value at millimeter waveband was discussed. The magnetic anisotropy field is successfully decrease from 17 kOe to 10 kOe by substituting Cobalt, which lower the Ferromagnetic resonance frequency and benefit for extending the bandwidth for the circulator. With the cobalt substitution, the saturation inevitably decreases from 60 emu/g to 45 emu/g. The site preference of cobalt in five crystallographically inequivalent Fe ions was calculated using software castep. The influence of site preference on lattice parameters and magnetic saturation was calculated and discussed. The result show cobalt mainly sites 2a and 12k position.

Static magnetic, complex dielectric and complex permeability properties of aluminum substituted hexagonal barium ferrites based on doping concentration

The regulation of magnetic and dielectric properties for hexagonal barium ferrites by ion doping is highly desirable in magnetic recording and microwave absorption. Herein, aluminum (Al)-substituted barium hexaferrite with the general formula of BaFe12−xAlxO19 (x: 0, 0.6, 1,2, 1.8) was obtained. The influences of the Al3+ doping concentration on the crystal structure, microstructure, static magnetic, complex dielectric and permeability properties of hexagonal barium ferrites were studied. The morphologies and crystal structure characterizations confirm the Al3+ ion has effective doping in the hexagonal barium ferrites and substituted for Fe3+ in positions of 2b site. The lattice parameters and grain size of the hexagonal barium ferrites were dependent on the doping concentration. The magnetic characterization displays the saturation magnetization decrease while the coercivity increase with the doping concentration. The high-value about 8249 Oe of coercivity can be obtained at x = 1.8. The dielectric properties measurement further indicates that Al doping could improve both real and imaginary parts of permittivity. The highest value of the real part of permittivity was obtained at x = 1.2. Lastly, the complex permeability spectrum displayed the doping of Al ions not only regulate the complex permeability but also influence the domain wall resonance frequency, which is significant for controlling the application frequency.

Magnetic Study on Divalent Ion Substituted Barium Hexaferrites

Magnetic properties of Co, Ni and Zn substituted barium hexaferrite (BaM) samples prepared by solid state ceramic method were studied. Saturation magnetisation were found higher for Zn-substituted BaM, whereas, coercivity is higher for Co2+ and Ni2+ ion substituted samples. Anisotropy field for all substituted samples was calculated by the law of approaching saturation. Remanence, squareness and thermomagnetic plot suggest Zn2+ ions restricts the magnetic interaction of various sites in BaM.

Ce–Dy substituted barium hexaferrite nanoparticles with large coercivity for permanent magnet and microwave absorber application

M-type barium hexaferrites (BaM) with the substitution of Ce–Dy ions were synthesized using the sol-gel auto-ignition method. The prepared materials were explored for their application as a permanent magnet and microwave absorbing material. The structural properties, phase evaluation, micro-strain, morphological analysis, magnetic behaviour, microwave absorbing properties and optical properties were studied by employing various techniques. The structural parameters and phase identification obtained by Rietveld refinement confirmed the formation of an M-type hexaferrite structure for pure BaM, whereas Ce–Dy substitution induced secondary phases of cubic CeO2 and ortho DyFeO3. Crystallite size obtained from Williamson–Hall plots increased from 27.1 nm to 30.8 nm with the introduction of Ce–Dy ions in BaM. The nanocrystalline nature of the prepared samples was confirmed using scanning and transmission electron microscopy techniques. Fourier transform infrared spectra of all the samples were recorded in the wavenumber range of 400–4000 cm−1 and also supported the x-ray diffraction findings by confirming the formation of samples with hexaferrite structures. Coercivity of the BaM hexaferrites improved from 4430 to 5721 Oe with the Ce–Dy substitution. A Ce–Dy substituted BaM hexaferrite sample of 3 mm thickness showed a maximum reflection loss of −16.3 dB around 16.7 GHz. Permittivity and permeability studies were carried out to understand the microwave absorption behaviour.

Effect of Eu3+ ions on electrical and dielectric properties of barium hexaferrites prepared by solution combustion method

This paper reports the electrical conduction behaviour of Eu3+ substituted barium hexaferrites (BaM) prepared via solution combustion method. The structural analysis confirms formation of hexagonal phase of the prepared samples with a space group p63/mmc (No. 194). The SEM micrographs show that the prepared sample has hexagonal plate like structure. Dielectric constant, dielectric loss and AC conductivity of the prepared samples were calculated over a wide frequency range from 102 Hz to 105 Hz at different temperatures. The temperature dependent dielectric studies were also performed over a temperature range of 30°C–200°C. The non –Debye dielectric nature of the prepared samples and presence of electrical relaxation phenomenon were confirmed from the complex impedance spectroscopy. Electrical modulus analysis confirms that there is negligible electrode effect in prepared the samples. From the frequency dependent AC conductivity studies, we find that the AC conductivity values are constant in the lower frequency region and shift towards the higher value in the higher frequency region, which indicates that the prepared samples follow the Almond-West power law. The AC conductivity values decrease gradually with increase in the concentration of Eu3+ ions increases. The dielectric studies show that by doping of Eu3+ ions, the dielectric constant increases. So the prepared materials can be applicable for microwave devices applications.

Structural, dielectric and magnetic characteristics of Zr–Ni substitution on Barium X-type hexagonal ferrites synthesized through sol–gel autocombustion method

Zr–Ni substituted barium hexaferrites with chemical compositions Ba2Co2Fe28-2xZrxNixO46 (x = 0.0, 0.25, 0.50, 0.75, 1.0) are fabricated through sol–gel autocombustion approach. The composites characteristics before and after substitution are examined through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometery (VSM) and dielectric measurements techniques. The XRD spectrum confirmed the formation of single phase X-type ferrites with crystallinity lying in the range of 24.57–29.11 nm. FTIR results revealed the specific absorption bands in the range of 300–900 cm−1. SEM micrographs demonstrate platelet shape grains along some agglomeration. The M–H loops analysis deduce about saturation magnetization (Ms), retentivity (Mr), coercivity (Hc) and squareness ratio (Mr/Ms), and these results show ferrimagnetic nature of prepared particles. The magnetic dilution in magnetic moment of molecules cause reduction in Mr and Ms. Reduction in coercivity is related to magnetocrystalline anisotropy. After Zr–Ni substitution, a significant decrease is observed in remanance, saturation magnetization and coercivity. The dielectric parameters are determined in 20 Hz–1 MHz frequency range. The dielectric parameters are studied on the basis of frequency change. The behavior of dielectric parameters analyzed on the basis of Wagner and Koop’s phenomenological theory.