xO4 Ferrites Research Articles

Investigation of structural, electrical, and magnetic variations of Ni-Zn-Co ferrites by substituting rare earth Ho3+ for high-frequency applications

The investigation of structural, magnetic, and electrical properties of Ni0.6Zn0.3Co0.1HoxFe2−xO4 (NZCHF, 0 ≤ x ≤ 0.2) ferrites, synthesized through the sol–gel autocombustion method, has been undertaken. The refined x-ray diffraction (XRD) analysis was performed for XRD data analysis using Fullprof Suite software and it confirmed a single-phase cubic spinel structure, with the determination of crystallite size, refinement parameters and lattice constants. The bulk density of the samples consistently remained lower than the x-ray density, with densities increasing proportionally to the enhancement of Ho concentration. FTIR analysis corroborated the presence of metal-oxygen bonds within the ferrite possessing a spinel cubic structure. 57Fe Mossbauer spectroscopy showed that the hyperfine magnetic field of tetrahedral (A) and octahedral (B) sites decreased with the substitution of Ho3+ ions that preferentially occupy the B site. The impedance analyzer and vibrating sample magnetometer (VSM) were utilized to measure the real and imaginary parts of the complex permeability and magnetic properties of the samples, respectively. Complex impedance plots were scrutinized to discern the contributions of grain and grain boundary resistances, providing insights into the electrical behavior of the ferrite samples. Furthermore, the introduction of Ho concentration led to alterations in other key properties of the ferrites, including coercivity (H c ), retentivity (M r ), anisotropy constant (K), and magnetic moment (μ B ).The impact of the rare-earth content on the magnetic features of the prepared NiZnCo ferrite microspheres was investigated by analyzing magnetic-hysteresis (M-H) loops, which showed soft ferrimagnetism. Concurrently, the dielectric constant and dielectric loss tangent of the studied samples exhibited a decrease with the rise in Ho3+ concentration. The expected reduction in tan loss in the prepared samples is attributed to the increase in ac resistivity associated with the higher Ho3+ content.

Magnetically tuned Ni0.3Co0.7DyxFe2–xO4 ferrites for high-density data storage applications

Magnetically tuned Ni0.3Co0.7DyxFe2–xO4 ferrites for high-density data storage applications

Enhancement of coercivity, permeability, and dielectric properties of Co0.2Zn0.3Ni0.5EuxFe2–xO4 ferrites for memory and high frequency devices

Spinel cubic ferrites have huge applications in memory and high frequency devices. For the improvement of these modern devices, the magnetic coercivity, permeability, and dielectric properties of a ferrite are the important issues. This article focuses on improving the magnetic coercivity, magnetic permeability, and dielectric properties of Co0.2Zn0.3Ni0.5EuxFe2–xO4 ferrites, where x = 0.00, 0.06, and 0.10. The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), vibrating sample magnetometer (VSM), and an impedance analyzer were used to characterize the structural, magnetic, and dielectric properties of the samples. The XRD patterns indicate the formation of spinel cubic structure of the samples with a secondary peak (EuFeO3) for Eu doped samples. The densities and porosities of the samples follow an inverse trend, where the doped samples’ lattice parameters are increased with the increment of rare earth Eu concentration. The FTIR analysis also proves the spinel cubic phase of the samples. The average grain size of the ferrites is obtained via FESEM images, and it is increased from 121 to 198 nm. VSM analysis confirms that doping of the Eu content also changes other hysteresis loop properties of Co0.2Zn0.3-Ni0.5EuxFe2–xO4 ferrites. Particularly, the coercivity of the Eu doped samples is greater than that of the mother alloy (x = 0.00). The EDX study shows that there is no impurity contamination in the ferrites. The permeability and dielectric measurements show an improved quality factor of the Eu-doped samples with low magnetic and dielectric losses. Frequency dependent resistivity and impedance analysis also show the improved nature. From the observed properties of the samples, all the investigated ferrites might be strong candidates for potential applications in memory devices, magnetic sensors, and high frequency applications.

Effect of Sn doping on structural, magnetic and power loss properties of lithium ferrites for high frequency applications

The role of Sn doping on the structural, magnetic and power loss properties of Li0.5+0.5xSnxFe2.5-1.5xO4 ferrites (x = 0.0 to 0.20 in step of 0.05) + 0.5 wt % Bi2O3, prepared by solid state technique, has been investigated. X-ray diffraction reveals that Sn ions doped in lithium ferrite up to small concentration. Surface morphology recorded by SEM micrographs illustrates uniform, well connected grain growth in all samples. A small concentration of Sn doping in lithium ferrite improves the grain growth and densification. Magnetic parameters have been evaluated by M − H curves measured at room temperature by VSM. Saturation magnetization was found to be decreasing with Sn concentration in Li0.5+0.5xSnxFe2.5-1.5xO4 ferrites. In view of applicability of prepared samples for power devices, the magnetic permeability (μ* = μ′-jμ'′) has been recorded in the frequency range of 1 MHz–103 MHz at room temperature. Further, Power loss response has also been recorded in presence of magnetic induction (B = 10 mT) in frequency range of 50 kHz to 3 MHz. It was depicted a significant reduction in power loss in Sn = 0.05 doped lithium ferrite sample. Reduction in power loss with Sn doping makes it suitable for power applications.

Investigation of cation distribution, elastic and magnetic properties of Li0.3-0.5xCuxZn0.4Fe2.3-0.5xO4 ferrites

Investigation of cation distribution, elastic and magnetic properties of Li0.3-0.5xCuxZn0.4Fe2.3-0.5xO4 ferrites

Yttrium-substituted Co0.5Ni0.5YxFe2-xO4 ferrites as microwave absorbers by investigating structural, magnetic, dielectric, and absorption characteristics

The effect of Yttrium Substitution on Co0.5Ni0.5YxFe2- xO4 (0.0 ≤ x ≤ 1.0) Ferrites as Microwave Absorbers was investigated to include structural, magnetic, dielectric and X-band absorption properties. The main objective of this work is to enhance microwave absorption properties of materials with interesting dielectric/magnetic behaviors by doping rare earth element of Yttrium based on transition metals. The hydrothermal method was used to create Yttrium (Y) substituted nanoparticles, and the effects of Y-ion substitution on the characteristics, structural, magnetic features were examined by XRD, FT-IR, SEM-EDS, TEM-SAED, and VSM, respectively. Electromagnetic properties were obtained from microwave scattering parameters measured via a metal-backed transmission line and Nicholson-Ross Weir techniques using a vector network analyzer (VNA) in conjunction with an X-band waveguide set. Return loss (RL) values of the samples were obtained from the electromagnetic constitutive parameters (permittivity and permeability). According to the XRD measurements, hexagonal crystal structure of ferrite and YFeO3 as secondary phase nanocrystal sizes are between 11 and 67 nm. Refined structural parameters using Rietveld analysis are carried out using the TOPAS refinement program. A good match was observed between the diffraction patterns obtained and calculated by Rietveld analysis. Moreover, the morphological analyses indicate that the relatively small spherical structures of Ni-Co ferrites particles can be seen to change from spherical to hexagonal-shaped with increasing yttrium concentration. The results of the FT-IR study show that the spinel structure has formed as predicted because the expected range of absorption bands is present. According to magnetic measurements, the coercivity (Hc) results show a modest increase in porosity as the Y-content rises. The results revealed that the minimum RL value and bandwidth vary significantly with the amount of Yttrium in the mixture, indicating that the obtained structures will be useful for broadband microwave applications.

New Insights on the Spin Glass Behavior in Ferrites Nanoparticles.

The magnetic properties of nanocrystalline MxFe3−xO4 ferrites with M=Fe, Co, and Zn were investigated. The data support a core–shell model, where the core is ferrimagnetically ordered, and the shell shows a spin glass type behavior. The reduced magnetizations of spin glass components follow an mg = (1 – b/H−1/2) field dependence. The b values are strongly correlated with the intensities of exchange interactions. The field dependences of the magnetoresistances of Fe3O4 and ZnxFe3−xO4 nanoparticles pellets, experimentally determined, are well described if instead of the core reduced magnetization, commonly used, that of the shell is taken into account. For similar compositions of the nanoparticles, identical b values are obtained both from magnetization isotherms and magnetoresistances studies. The half-metallic behavior of spinel Fe3O4 based nanoparticles is discussed comparatively with those of double perovskites.

Impact of particle size on the magnetic properties of highly crystalline Yb3+ substituted Ni–Zn nanoferrites

Yb-substituted Ni0.5Zn0.5YbxFe2−xO4 (0 ≤ x ≤ 0.20 in the step of 0.04) ferrites have been synthesized using sol–gel auto combustion method. The structural characterization of the compositions has been performed by X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), quantum design physical properties measurement system (PPMS) that ensured the formation of single phase cubic spinel structure. Crystallite and average grain size are calculated and found to decrease with increasing Yb3+ contents. Saturation magnetization (Ms) and Bohr magnetic moment (µB) decrease while the coercivity increases with the increase in Yb3+ contents and successfully explained by the Neel’s collinear two sub-lattice model and critical size effect, respectively. Critical particle size has been estimated at 6.4 nm from the DXRD vs. Ms, Hc plot, the transition point between single domain regime (below the critical size) and multi-domain regime (beyond the critical size). Curie temperature (Tc) reduces due to the weakening of A–O–B super exchange interaction and redistribution of cations, confirmed by the M–T graph. The compositions retain ferromagnetic ordered structured below Tc and above Tc, it becomes paramagnetic, making them plausible candidates for high temperature magnetic device applications. The relative quality factor (RQF) peak is obtained at a very high frequency (≥ 108 MHz), indicating the compositions could also be applicable for high frequency magnetic device applications.

Enhanced Photocatalytic Activity of Spherical Nd3+ Substituted ZnFe2O4 Nanoparticles.

In this study, nanocrystalline ZnNdxFe2−xO4 ferrites with x = 0.0, 0.01, 0.03 and 0.05 were fabricated and used as a catalyst for dye removal potential. The effect of Nd3+ ions substitution on the structural, optical and photo-Fenton activity of ZnNdxFe2−xO4 has been investigated. The addition of Nd3+ ions caused a decrease in the grain size of ferrites, the reduction of the optical bandgap energies and thus could be well exploited for the catalytic study. The photocatalytic activity of the ferrite samples was evaluated by the degradation of Rhodamine B (RhB) in the presence of H2O2 under visible light radiation. The results indicated that the ZnNdxFe2−xO4 samples exhibited higher removal efficiencies than the pure ZnFe2O4 ferrites. The highest degradation efficiency was 98.00%, attained after 210 min using the ZnNd0.03Fe1.97O4 sample. The enhanced photocatalytic activity of the ZnFe2O4 doped with Nd3+ is explained due to the efficient separation mechanism of photoinduced electron and holes. The effect of various factors (H2O2 oxidant concentration and catalyst loading) on the degradation of RhB dye was clarified.

Structural, optical, and magnetic properties of Pr substituted Li–Ni Ferrites prepared by citrate -precursor method

The present research explores the structural, magnetic, and optical properties of Pr substituted Li–Ni ferrite, Li0.5Ni0.5PrxFe2−xO4 (where x = 0.01, 0.02, and 0.03) by low-cost citrate precursor method. The effect of Pr on physical, morphological, optical, multiferroic, and magnetic properties on Li–Ni ferrites are studied. Thermal analysis shows that the prepared material is stable after 500 °C. X-Ray diffraction revealed a single phase cubic spinal structure. Williamson–Hall plot was used to calculate the crystallite size, which was found to decrease from 30 to 15 nm with the addition of Pr3+ion. Surface morphology and size were studied using SEM and HRTEM, which show cuboids structure. The bond length was measured using FTIR and found to increase, while force constant decreases systematically with the addition of Pr3+ Indirect band gap was calculated using tauc plot and it was found to decrease from 2.28 to 2.22 eV with higher concentration of praseodymium ion. All the emissions peak in PL spectra lies in the visible range. Saturation Magnetization value was found in the range of 30.4–41.5 emu/g for Li0.5Ni0.5PrxFe2−xO4 ferrites. Coercivity value was found in the range of 148.58–192.60 Oe for Li-Ni-nano ferrite system, it also followed the decreasing trend having both least value i.e. saturation magnetization and coercivity at x = 0.03. This shows that the Pr-substituted material might be used in transformer cores due low coercivity and also in opto-electronic devices due to their improved optical and magnetic properties. The P-E loops measurement supports its functional property.

Structure, electromagnetic and dielectric properties of Ti-substituted lithium--zinc ferrite

Li0.35+0.5xZn0.3TixFe2..35–1.5xO4 (x = 0–0.4) ferrites waere prepared via a solid-state method. XRD refinement results show that diamagnetic Ti4+ ions enter octahedral lattice and replace Fe3+ at B site, resulting in the redistribution of B sublattice magnetic moment and ultimately reducing saturation magnetization. This mechanism is analyzed from the perspective of ion occupying distribution and substitution law. Globus relation is used to qualitatively analyze the law of initial permeability change with temperature and titanium content, and the main influencing factors are revealed. The variation of initial permeability and permeability loss with frequency and its causes have been explored, which are attributed to domain wall displacement, domain rotation and various resonance effects, especially domain wall resonance. The dominant characteristics and main influencing parameters of the three types of power losses in different frequency bands were studied quantitatively, and the transition law of the main mechanism of power losses with the change of frequency was explored. The variation of dielectric properties with frequency, titanium content and temperature was studied and analyzed utilizing polarization mechanism and Koops model.

Effect of Mn-substitution on the structure Co0.6Zn0.4Fe2O4

One Ferrite is a ferromagnetic substance where it is ideally used to manufacture devices such as rectifiers, memory devices, and inductors hearts as well as for various applications of microwave waves. The electrical and structural characterization of ferrites depends on preparation methods, nature of dopant, and dopant concentration. For these reasons, the series samples of Co0.6Zn0.4MnxFe2−xO4 ferrites prepared, using a traditional ceramic process, Mn-Zn ferrites were synthesized and sintered up to 1200 °C for 5 hours. We tested the X Ray diffraction (XRD) for different Mn-substitution (where x = 0, 0.2, and 0.4). XRD studies confirmed that the sample’s structural have a cubic spinel phase. The electrical characterization (such as conductivity, real and imaginary dielectric constant) was measured and discussed, as well.

Composition-dependent magnetic properties of exchange-coupled hard/soft Co0.55Ni0.4NdxFe2.05–xO4/Co composites

The cubic Co0.55Ni0.4NdxFe2.05–xO4 (0 ≤ x ≤ 0.12) ferrites are synthesized by thermal decomposition of metal oxalates at 900 °C, and subsequently reduced at 550 °C in 5% H2–Ar ambient to obtain the Co0.55Ni0.4NdxFe2.05–xO4/Co composites. X-ray diffraction patterns of Co0.55Ni0.4NdxFe2.05–xO4 samples confirm the co-existence of the main spinel CoFe2O4 and trace amounts of impurity NdFeO3 and Fe2O3 phases. After being reduced, impurity NdFeO3 and Fe2O3 phases disappear, a new reduction product cobalt (Co) phase appears. All Co0.55Ni0.4NdxFe2.05–xO4/Co composites exhibit a typical single-phase magnetic behavior, suggesting the existence of exchange-coupling. Compared with Co0.55Ni0.4NdxFe2.05–xO4, the specific saturation magnetization of composites increases markedly from 55.05 (Co0.55Ni0.4Nd0.04Fe2.01O4 calcined at 900 °C) to 70.04 emu/g (Co0.55Ni0.4Nd0.04Fe2.01O4/Co reduced for 30 min), accompanied with a relatively small decrease of coercivity from 622.98 to 579.94 Oe. Exchange-coupling effect in Co0.55Ni0.4NdxFe2.05–xO4/Co composites is confirmed by the switching field distribution curves further.

Cr content-dependent modification of structural, magnetic properties and bandgap in green synthesized Co–Cr nano-ferrites

Honey green synthesis of CoCrxFe2−xO4 (x = 0.0 − 1.0) ferrites with increasing Cr content was done by sol-gel auto-combustion method, without any post-preparation thermal treatment. Nanocrystalline nature (grain diameter range between 12.2 nm and 27.9 nm) of the studied samples is confirmed by X-ray diffraction (XRD) data. Observed modification of magnetic properties can be understood in terms of Cr addition induced changes in degree of inversion, modification of disorder affecting A–A, A–B, B–B interaction, re-distribution of cations on A, B sites in the spinel lattice. Grain size (D)-dependent coercivity (Hc) shows that the studied samples lie in the region with overlap between single- and multi-domain regions. Achieved magnetic properties in the studied honey green synthesized samples have significance for self-regulating hyperthermia applications. Results as well reveal modification of bandgap, and would be of use for applications, where minor bandgap tuning is required. Antistructure modeling provides information on the types of surface-active centers.

Frequency and temperature dependent magnetic properties with structural Rietveld refinement of Co0.25Zn0.75YxFe2−xO4 ferrites

Doping of rare earth (RE) ions can influence the magnetic properties in spinel ferrites, whereas the phase formation plays an important role. Therefore, it is important to choose the RE ions for doping content to get more benefit. In this work, synthesis of Yttrium doped Co-Zn ferrites were carried out by the method of solid state reaction. Co0.25Zn0.75YxFe2−xO4 (CZYF) is the general formula of the studied ferrites where x = 0.00, 0.02, 0.04, 0.06 and 0.08. The structural properties of CZYF ferrites were studied by X-ray diffraction (XRD) technique and further refined by Rietveld method. XRD and Rietveld refinement approved that all the CZYF samples are cubic spinel structure and the lattice parameters were increased with increasing Y content. The variation of grain growth and surface morphology of CZYF samples were studied from SEM images indicated that the average grain size increased from 1.412 µm to 2.341 µm. Frequency dependent magnetic properties (complex permeability, loss factor) were observed in the range of 100 Hz to 120 MHz at 300 K (room temperature). The initial permeability of CZYF ferrites are found to decrease with the increase in Y content. This decrease nature of permeability is related to the increase of porosity and average grain size. At three different temperatures (80 K, 200 K and 300 K), we measured saturation magnetization, coercivity and remanent magnetization. The mentioned properties make CZYF ferrites applicable for use as a soft ferrite.

Development of tungsten doped Ni-Zn nano-ferrites with fast response and recovery time for hydrogen gas sensing application

This paper reports on the study of series of tungsten doped Ni0.5Zn0.5WxFe2−xO4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) ferrites synthesized by a co-precipitation scheme. The crystallite size varies from 62 to 49 nm and the scanning electron microscope (SEM) images show the spinel cubic structure of the powder sample. Energy Dispersive X-ray Fluorescence Spectroscopy (EDXRF) confirms the presence of Ni, Zn, W and Fe elements in the prepared samples. The specific surface areas of the Ni0.5Zn0.5W0.2Fe1.8O4, Ni0.5Zn0.5W0.4Fe1.6O4 and Ni0.5Zn0.5W0.6Fe1.4O4 samples calculated from Brunauer-Emmett-Teller (BET) method are 18.9 m2/g, 21.5 m2/g and 24.6 m2/g, respectively. The metal oxide pellet type resistive sensor was made for gas sensor application. These sensors are selective for hydrogen (H2) gas. The performance of these sensors for sensing hydrogen gas at a concentration of 1000 ppm in the temperature range 80–300 °C has been investigated. Platinum electrodes were deposited on all the pellets by RF sputtering technique. The subsequent decomposition of platinum oxides on the metal oxide pellet surface results in an increase in surface roughness and electrical resistivity. The sensor shows a change in resistance from 1.21 × 105 Ω to 7.83 × 104 Ω in the presence of H2 gas even at alow temperature. The composition with x = 0.2 at an optimum temperature of 180 °C showed a fast response (14 s) and recovery time (20 s). High sensitivity, low cost, long term stability, high selectivity and fast response at low temperature makes this sensor useful for industrial applications.

Study of physical properties towards optimizing sintering temperature of Y-substituted Mg-Zn ferrites

Optimum sintering temperature (Ts) plays an important role in controlling densification and growth of grains which greatly affect the magnetic and electrical properties of polycrystalline materials. Y-substituted Mg-Zn [Mg0.5Zn0.5YxFe2−xO4 (0 ≤ x ≤ 0.05)] ferrites have been prepared by using conventional standard ceramic technique and were sintered between 1100 and 1300 °C in the steps of 50 °C. Characterizations of the samples have been done by X-ray diffraction (XRD) technique, field emission scanning electron microscopy (FESEM), dielectric and permeability measurements to find the suitable Ts. XRD data have been analyzed and the results confirmed the same information regarding phase analysis at different Ts. Further characterization of the samples, sintered at 1100 and 1150 °C, were not continued due to their low density and high porosity. FESEM images indicate the change in microstructure with Ts. The decrease (increase) of ac electrical resistivity with Ts (Y content) has been observed while the dielectric constant behaves in opposite manner. Impedance spectroscopy also exhibited similar trend as ac electrical resistivity. The initial permeability revealed the wide stability zone of frequency and different optimum Ts for different compositions. The ac resistivity values for the compositions have been found higher at 1200 °C, but the compositions have highest value of bulk density and permeability at other Ts. The effect of Ts on the physical properties (bulk density, porosity and permeability) of Y-substituted Mg0.5Zn0.5YxFe2−xO4 (0 ≤ x ≤ 0.05) ferrites elucidate that the optimum Ts should be of 1250 °C for x = 0.01, 0.02 and 0.03 while the Ts should be of 1300 °C for x = 0.04 and 0.05.

Microstructure, magnetism, and high‐frequency performance of polycrystalline Ni0.5Zn0.5Sm0.025HoxFe1.975−xO4 ferrites

AbstractNovel polycrystalline Ni0.5Zn0.5Sm0.025HoxFe1.975−xO4 (x = 0‐0.06) ferrites were fabricated by a traditional solid‐state reaction sintering method. The codoping effects of Sm and Ho on the microstructure, magnetism, and high‐frequency performance of Ni–Zn ferrites were investigated. The substitution of Sm3+ and Ho3+ ions led to an apparent increase in the lattice constants. However, further increasing the addition of both dopants introduced SmFeO3 or HoFeO3 foreign phases at the boundaries of the polycrystalline grains. As the content of Ho3+ ions increased, the relative density and average grain size of the specimens decreased accordingly. Moreover, the substitution of Sm3+ clearly decreased the saturation magnetization and complex permeability, which further decreased with the doping of Ho3+. The evolution of the Curie temperature showed an opposite trend, reaching the highest temperature of 278°C when x = 0.03. Similarly, the coercivity and resonance frequencies also displayed opposite trends compared to those of the saturation magnetization and complex permeability. The codoping of Sm3+ and Ho3+ more effectively lowered the magnetic and dielectric loss tangent of the specimens compared with the undoped or single dopant modified ferrites.

The influence of Sc3+ ions on the microstructure, electrical, and gas-sensing properties of Ni–Co–Sc ferrite

The influence of Sc3+ ion content on the microstructure, electrical, and gas-sensing properties of Ni0.5Co0.5ScxFe2–xO4 (x = 0.0, 0.05, 0.1 and 0.2) ferrites synthesized by a novel self-combustion method using polyvinyl alcohol as the colloidal medium, was studied. X-ray diffraction, X-ray photon spectroscopy (XPS), Brunauer–Emmett–Teller (BET) surface area, scanning electron microscopy (SEM), and energy-dispersive X-ray analysis (EDX) were employed to characterize the structure and morphology properties of these ferrites. The gas-sensing properties of hydrogen, methane, ethanol, methylene chloride, and benzene were investigated. The samples show p-type semiconducting properties for the studied gases within the temperature range of 100–380 °C. The results revealed that the partial substitution of Fe3+ by Sc3+ ions on the octahedral sites of the spinel structure of Ni0.5Co0.5Fe2O4 ferrite has a favorable effect on the sensing activity of this ferrite. The increase of the degree of Fe3+ ion substitution by Sc3+ ions up to x = 0.2 in the basic composition (Ni0.5Co0.5Fe2O4) results in the increase of the response and the decrease of the optimal operating temperature for all the studied gases. The sensor element Ni0.5Co0.5Sc0.2Fe1.8O4 (x = 0.2) has the best response to benzene (2.57) and to methylene chloride (2.10) at the operating temperature of 175 °C for a gas concentration of 500 ppm and a relative humidity of 50%.

Effect of praseodymium doping on the phase transitions of barium orthoferrites

In this article, an effort was made to explore the properties of praseodymium-substituted barium orthoferrites with a better performance in absorption of microwaves. Orthoferrites with BaPrxFe2−xO4 (0 ≤ x ≤ 0.1) were prepared using an ultrasound-assisted sonochemical reactor. In this study, ultrasonic technique was used for the preparation and characterization of BaPrxFe2−xO4 (0 ≤ x ≤ 0.1) materials. X-ray diffraction (XRD) pattern was used to determine the structural properties such as phase purity and crystallite parameters. Analysis of the XRD pattern indicated that the prepared BaPrxFe2−xO4 ferrites have orthorhombic structure with the Bb21 m space group. The temperature-dependent AC susceptibility (χac) and in situ ultrasonic measurements were carried out to explore the Curie temperature of the BaPrxFe2−xO4 samples. Magnetic properties of the prepared BaPrxFe2−xO4 orthoferrites showed narrow M − H hysteresis loops. The coercivity of barium-based samples was found to increase with praseodymium substitution whereas the remenance and saturation magnetization decreased.