O4 Ferrites Research Articles

The influence of pre-sintering temperature on the structural, magnetic, and dielectric properties of Sr0.67La0.33Fe11.7Zn0.1Co0.2O19 ferrite

The present study explores the impact of varying heat treatment temperatures on the magnetic properties, structural configuration and dielectric characteristics of Sr0.67La0.33Fe11.7Zn0.1Co0.2O19 ferrite. M-type ferrite was synthesized using the traditional solid-state method, with thermal treatment temperatures incrementally increasing from 1230 °C to 1310 °C. Pure M-phase strontium ferrite was achieved at temperatures above 1250 °C. The ideal pre-sintering temperature was identified as 1270 °C, where several factors coalesced to enhance the magnetic properties, including the completion of the solid-state reaction and the diminution of the easily magnetized c-axis, which together fostered the intensification of the superexchange interaction. At this temperature, the magnetic properties reached their zenith, with a saturation magnetization (Ms) of 84.81 emu/g, a remanence (Br) of 419 mT, and a coercivity (Hcj) of 3301 Oe. Additionally, the dielectric constant was significantly high at low frequencies but rapidly declined with increasing frequency, achieving its optimal performance at 1270 °C.

Tunable annealing temperature for the structural, magnetic, optical, and dielectric characteristics of Mn0.5Zn0.5Ni0.5Fe1.5O4 nano-ferrite

The as-prepared Mn0.5Zn0.5Ni0.5Fe1.5O4 ferrite was prepared by the co-precipitation process and annealed at 300, 500, 900, and 1100 °C. The single-phase cubic spinel structure was confirmed by XRD patterns, Rietveld fitting, TEM imaging and several structural parameters, including crystalline size and lattice constant have been examined. The FTIR spectrum confirmed the main two absorption bands of tetrahedral and octahedral sites in ferrite, where the elastic parameters such as force constants and Debye temperature have been investigated. The saturation magnetization increases with the annealing temperature, while the energy band gap decreases with the annealing temperature, and also the ac conductivity decreases with annealing temperature.

Improved gyromagnetic properties of LiZnTi ferrites co-fired with Bi2O3-La2O3 additives at low temperature

In this work, low temperature-sintered Li0.43Zn0.27Ti0.13Fe2.17O4 ferrites mixed with x wt.% (x = 0.00–0.30 wt%) of La2O3 and 1.5 wt% of Bi2O3 were successfully prepared by the solid-state reaction method. The variations in phase composition, microstructure, and gyromagnetic properties of the as-prepared samples were studied in detail. XRD patterns and refinement results show that La2O3 didn't affect the formation of the spinel phase, but a small amount of La3+ might enter into the lattice structure. The micro-morphological analysis and grain size statistics demonstrate that the addition of La2O3 significantly suppressed the grain growth, and the average grain size decreased from 2.19 μm (x = 0.00 wt%) to 1.14 μm (x = 0.15 wt%). The uniformity of the grain size distribution was improved, and the degree of densification was significantly increased. Meanwhile, the saturation magnetization (4πMs) increased from 3921 Gs to 3989 Gs, the coercivity (Hc) decreased from 457.5 A/m to 312.5 A/m, and the ferromagnetic resonance linewidth (ΔH) decreased from 328.5 Oe to 220.7 Oe. Our study indicates that the Bi2O3-La2O3 mixture is an effective sintering additive for low-temperature sintering of LiZnTi ferrite ceramics, which will play an important role in the development of low-temperature co-fired ferrites.

Phase composition, microstructure, and gyromagnetic properties of LiZnTi ferrites sintered at low temperature

In this study, a series of Li0.43Zn0.27Ti0.13Fe2.17O4 ferrites were successfully synthesized by solid-state reaction method at 920 ℃ employing low melting point V2O5 as sintering aid. The X-ray diffraction (XRD) studies demonstrated that all samples exhibited spinel phase. Microscopic image analysis revealed that both the grain growth and uniformity were significantly promoted. The average grain size was increased from 0.65 µm to 4.53 µm when V2O5 was increased from 0.0 wt% to 2.4 wt%. In terms of the magnetic properties, the saturation magnetization (4πMs) of the samples increased from 2915 Gs to 3434 Gs, the coercivity (Hc) decreased from 848.3 A/m to 242.2 A/m, and the ferromagnetic resonance linewidth (ΔH) decreased from 963 Oe to 543 Oe. It could be noted that the proper addition of V2O5 is the key to optimizing the microstructure and magnetic properties of LiZnTi microwave ferrite. Therefore, as an effective additive, V2O5 can promote the development of low temperature co-fired ferrites.

Investigate structural, morphological, electrical, dielectric and magnetic properties of dysprosium doped Cobalt-Nickel ferrites and their response to gamma irradiation

Nanocrystalline Co1-xNixFe2-yDy0.5O4 ferrites were successfully prepared by the sol–gel auto-combustion method. The samples were gamma-irradiated using a cobalt-60 source. XRD analysis reveals the formation of cubic spinel structure. FTIR study is used to confirm the formation of the expected spinel ferrite structure. Two probe method was used to measure DC electrical resistivity and the Arrhenius relation was used to calculate activation energy for non-irradiated and irradiated ferrites. Frequency dependent dielectric properties of the non-irradiated and irradiated ferrites were studied at room temperature. The dielectric constant for most of the gamma-irradiated samples increases because defects are induced in the material which increases space charge polarization in the samples. Magnetic properties of non-irradiated and irradiated nano ferrites were studied using VSM. Coercivity decreases after irradiation because decrease in grain size which increases surface state pinning of the domains.

Probing the influence of V2O5 and SBZKN composite additives on the magnetic characteristics and power loss of low-temperature sintered NiCuZn ferrites

Soft magnetic ferrites with exceptional magnetic characteristics and low power loss are in continuous demand in both academia and industry. In this work, a series of Ni0.22Cu0.31Zn0.47Fe1.98O4 ferrites doped with 0.5 wt% V2O5 and different SiO2-B2O3-ZnO-K2CO3-Na2CO3 (SBZKN) contents were synthesized using a conventional solid-phase method under a low sintering temperature of 925 ℃. The crystal phase, density, microstructure, grain size distribution, magnetic characteristics and power loss of the NiCuZn ferrites were studies to elucidate the composition-structure-property relationship. The underlying mechanisms were also thoroughly analyzed. The results showed that all the samples had a single-crystalline phase and dense microstructure when sintered at 925 ℃. As the SBZKN content increased, the density, saturation magnetization (Ms), residual magnetization (Br), complex permeability and quality factor (Q factor) exhibited a varying trend that increased initially and then decreased, while the coercivity (Hc) and power loss (Pcv) showed the opposite trend. The highest values of density, Ms, Br, magnetic permeability and Q factor of NiCuZn ferrites, obtained at an SBZKN content of 0.3 wt%, were 5.121 g/cm3, 51.07 emu/g, 188.47 mT, 389.8 and 114.3, respectively, while the lowest Hc and Pcv were obtained. The analysis showed that these outstanding magnetic and power loss characteristics were attributed to the uniform distribution of grain size and densification of NiCuZn facilitated by V2O5 and SBZKN incorporation.

Effects of thermal, stress, and electric fields on microstructure and ion distribution of (Mg0.1Mn0.1Co0.1Ni0.2Ti0.1Cu0.1Zn0.2)Fe2.1O4 spinel ferrites

In this work, conventional sintering, hot-pressing sintering, and spark plasma sintering techniques were utilized to simulate the thermal field, thermal-stress field, and thermal-stress-electric field, respectively. The effects of these fields on the microstructure and cation distribution of the (Mg0.1Mn0.1Co0.1Ni0.2Ti0.1Cu0.1Zn0.2)Fe2.1O4 ferrite (HEF) material were comprehensively analyzed. The results indicate that in the temperature range of 1000–1100 °C, the thermal field provides the driving force for sintering, promotes grain growth (average particle size: 2→7 μm), and increases crystallinity degree. The stress field brings the particles into close contact with each other, facilitates diffusion, and delays grain growth (0.5→5 μm). The electric field reduces grain boundary energy, causes mass transfer, and makes the grains finer (0.5→0.7 μm) and more uniform. Mathematical model analysis reveals that the thermal field is beneficial to the random distribution of cations, which yields an inversion degree (γ) of about 2/3 and increases the configuration entropy of HEF. The stress field leads to lattice distortion, permits ions with larger radius to occupy tetrahedral positions, and changes the cell parameters and oxygen position parameter of HEF. Finally, the interaction between electric field and crystal charges increases the electrostatic field energy, which promotes the formation of positive spinel structure and maximizes the crystal field stability energy. X-ray photoelectron spectra, Raman spectra, and change in lattice constant confirm the rationality of the mathematical model, and can be used to establish the model of the crystal structure under field effects.

Effect of calcination temperature on structural, magnetic, and dielectric properties of Mg0.75Zn0.25Al0.2Fe1.8O4 ferrites

Based on the desire to improve material properties, the effects of temperature have begun to be investigated. It was found that for nano-sized powder materials, such as ferrites, the structural properties like crystal structure and grain size, as well as many magnetic and electrical properties depending on them, change with the calcination temperature. Considering these changes, the effect of calcination temperature on the structural, magnetic, and electrical properties of MZA ferrites (Mg0.75Zn0.25Al0.2Fe1.8O4) prepared by co-precipitation was investigated in this study. The produced MZA ferrites were calcined at three different temperatures (600, 700, and 800 °C). The X-ray diffraction results showed that the samples exhibited a cubic spinel structure. It was found that the crystal sizes (D_sch) calculated using the Debye-Scherrer equation increased with increasing calcination temperature (22.47, 33.53, and 42.53 nm). From the Williamson–Hall (W–H) plots, crystal sizes were calculated almost same as Debye–Scherrer crystal sizes. The nano-sized particles were examined by scanning electron microscope (SEM). Elemental analysis was performed using EDX. ν1\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${\ u }_{1}$$\\end{document} and ν2\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$${\ u }_{2}$$\\end{document} absorption bands and O–H and C–H vibrations were detected in the FTIR spectra. Magnetic measurements were carried out at room temperature and in the range of ± 60 kOe under the applied field. Magnetic results are explained by superparamagnetism. Dielectric measurements were performed at room temperature and a frequency range of 20 Hz to 10 MHz. The dielectric properties can be explained by Maxwell–Wagner theory. Impedance spectroscopy study revealed that the relaxation mechanism is consistent with the Cole–Cole model. In AC conductivity studies at room temperature, it was found that the sample calcined at 600 °C would be suitable for energy storage devices.

Designing bi-functional Ag-CoGd0.025Er0.05Fe1.925O4 nanoarchitecture via green method

In the current study, we developed a simple and biocompatible method for producing core–shell nanoparticles (NPs). Citrate auto combustion and green procedures were used to create core–shell Ag/CoGd0.025Er0.05Fe1.925O4 (Ag/CGEFO) sample with an average crystallite size of 26.84 nm. The prepared samples were characterized via different structural techniques, such as x-ray diffraction (XRD), Raman Spectroscopy (RS), High-Resolution Transmission Electron Microscopy, and Energy Dispersive x-ray analysis. These analyses were utilized to characterize and confirm the successful formation of the core–shell architecture. For core–shell NPs, all peaks of Ag and CGEFO ferrite are detected in the XRD, confirming the co-presence of the ferrite spinel phase and the cubic Ag phase. The magnetic hysteresis curves demonstrate typical hard ferri-magnetic behavior along with maximum magnetic saturation values up to 53.74 emu g−1 for the CGEFO sample, while an enhanced coercivity is detected for the coated sample. Moreover, the width of the hysteresis loop is increased for the Ag/CGEFO sample compared to the uncoated one. This indicates that the addition of Ag as a shell increases magneto crystalline anisotropy. Moreover, the E g of uncoated CGEFO is equal to 1.4 eV, increasing to 3.6 eV for coated ones. This implies the influence of CGEFO is diminished when the surface is coated with Ag (shell), and the reflectance of the Ag/CGEFO core–shell is nearly dependent on the reflectance of the Ag shell layer. Consequently, the Ag/CGEFO can be used as a light shielding substance.

Influence of Zn-substitution on structural, magnetic, dielectric, and electric properties of Li–Ni–Cu ferrites

The polycrystalline Li0.15Ni0.6-xZnxCu0.1Fe2.15O4 ferrites are fabricated by the method of conventional solid-state reaction technique. The X-ray diffraction (XRD) confirms that the structure of the composition is a single-phase cubic spinel structure for all samples. The particle size of the compositions is varied from 36 to 52 nm. The lattice parameter and densities are found to increase with enhancing Zn content, as the ionic radius and atomic weight of Zn are greater than Ni. The porosity exhibits a decreasing trend. The average grain size determined using Field Emission Scanning Microscopy (FESEM) increases until x = 0.40, then declines. The Energy-Dispersive Spectroscopy (EDS) examination revealed that the percentage of obtained elements is well matched with the stoichiometric elements. The addition of Zn content acts as an accelerator for enhancing the value of the real part of initial permeability and the highest value is obtained (μiʹ = 276) for the x = 0.40 sample, as well as the highest relative quality factor (RQF) of around 3000. The loss factor for the Zn substituted composition is nine times lower than for the parent composition. The optimum saturation magnetization of around 77.49 emu/g is found for the x = 0.40 sample. The maximum dielectric constant (εʹ = 2.85 × 103) is found for x = 0.10 samples at 10 kHz. Further, from impedance studies, the non-Debye type dielectric relaxation is seen for the Zn-substituted samples. The observed region of the imaginary electric modulus peak signifies the transition of charge carrier mobility from a larger range to a short-range distance. The phenomenon of ac conductivity is attributed to the process of the small polaron hopping mechanism.

Enhanced properties of Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4 ferrites co-fired with Bi2O3–B2O3 additive at low sintering temperatures

In this study, Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4 ferrites were co-fired with Bi2O3–B2O3 (BB) additive at low sintering temperatures (∼920 °C), and the effects of BB additive on various properties of Li–Zn ferrites were systematically investigated. First of all, the existence of BB additive would not pollute the spinel phases of Li–Zn ferrites, in contrast, it could make the ferrites well-ripened at low temperatures. The micro-morphology results revealed that the introduction of BB additive could significantly promote the grain growth, where the average diameter of grain size increased from 0.81 μm (0.0 wt % BB) to 8.12 μm (0.5 wt % BB), leading to a higher densification degree and density. Owing to the liquid phase formed in the sintering process, magnetic properties of the Li–Zn ferrites were improved with the assistance of BB additive. The saturation flux density (Bs) and saturation magnetization could reach a maximum value of 319.3 mT and 74.2 emu/g, respectively. The coercivity (Hc) and ferromagnetic resonance (FMR) linewidths (ΔH) could reach a minimum value of 176.3 A/m and 243.2 Oe, respectively. Finally, it is noted that the optimal values of these parameters are obtained under the condition of 0.5 wt % BB additive doped, and most magnetic properties would be deteriorated when exceeding the above content. Thus, BB additive is considered as a promising sintering aid for synthesizing Li–Zn ferrites at low temperatures, which will play a vital role in the development of low-temperature co-fired ceramics (LTCC) technology.

Effect of Mg content on microstructure and magnetic properties of ZnCoNiMg ferrite

Zn0.35Co0.05Ni0.60-xMgxFe1.96O4 ferrites (x = 0, 0.08, 0.16, 0.24, 0.32, 0.40) were prepared via a solid-state reaction. The phase composition and microstructure of the ferrite powders were analysed and the samples were determined to be pure spinel ferrites. At x = 0.24, the volume loss (PCV) of this ZnCoNiMg ferrite was as high as 829.23 mW/cm3. An increase in the amount of Mg substitution decreased the density of the ferrite sample, resulting in a larger PCV. Analysis of the magnetic hysteresis (M − H) loops revealed that ZnCoNiMg ferrites had the distinct magnetic properties of a soft magnetic ferrite. When x = 0.24, the reflection loss of this ZnCoNiMg ferrite sample had a minimum value of −36.713 dB under certain conditions. The more single domain particles, the more electromagnetic energy absorbed by ferromagnetic resonance effect. Based on these magnetic properties and absorption properties, the ZnCoNiMg ferrites have excellent potential for absorbing electromagnetic energy and are suitable for fabricating wave-absorbing materials.

Microstructure, magnetic, and power loss characteristics of low‐sintered NiCuZn ferrites with La2O3‐Bi2O3 additives

AbstractLow‐temperature‐sintered Ni0.5Cu0.125Zn0.375Fe1.98O4 ferrites co‐added with x wt% (x = 0.00‐0.25 wt%) La2O3 and 0.25 wt% Bi2O3 were successfully prepared via conventional solid‐phase reaction method. The phase composition, microstructure, magnetic properties, and especially power loss variation of the samples were systematically studied. The results showed that all samples possessed a single spinel phase structure at a sintering temperature of 900°C, exhibiting high degree of densification and uniform grains. The appropriate amount of La2O3 additive improved the saturation flux density and permeability of NiCuZn ferrites, simultaneously reducing the coercivity and power loss. The maximum permeability and the lowest power loss were achieved at x = 0.15 wt%. The corresponding sample had the homogeneous microstructure and excellent magnetic properties, being a promising low‐temperature co‐fired ferrite candidate for magnetic power components.

Investigation of structural, morphological and magnetic study of Ni–Cu-substituted Li0.5Fe2.5O4 ferrites

Investigation of structural, morphological and magnetic study of Ni–Cu-substituted Li0.5Fe2.5O4 ferrites

Effects of ytterbium substitution on the structural, electrical and magnetic properties of Ni–Zn–Co ferrites for microwave equipment

Given the significant impact of microstructure and material composition on material properties, this paper utilizes ytterbium nitrate to enhance the dielectric and magnetic characteristics of NiZnCo ferrite ceramics. In this study, Ni0.5Zn0.4Co0.1Yb0.075Fe1.925O4 ferrites with lower magnetic losses and a substantial cutoff frequency were successfully created using the sol-gel self-propagating method. The study reveals that the adding of ytterbium ions rises the lattice constant from 8.3377 to 8.3586 Å, the porosity from 4.77% to 6.92%, theoretical X-ray density from 5.43 to 5.66 g/cm3, and bulk density from 5.18 g/cm3 to 5.27 g/cm3. The incorporation of ytterbium ions in ferrite decreases the dielectric constant as well as dielectric losses, enhances the DC resistance, and lowers the eddy current loss in the frequency range of 100 Hz to 1 MHz. The addition of ytterbium ions decreases the initial permeability and saturation magnetization of the material while increasing its magnetic quality factor. Additionally, the cut-off frequency shifted to a higher frequency range, from 25.7 MHz to 121.61 MHz, while exhibiting lower losses at higher frequencies. The addition of ytterbium ions has expanded the potential applications of NiZnCo ferrite in high-frequency microwave devices and wireless communications.

Synthesis, characterization, and supercapacitor applications of Ni-doped CuMnFeO4 nano Ferrite

Nickel (Ni) doped magnetically separable Cu1-xNixMn1.0Fe1.0O4 ferrite was synthesized using the sol-gel auto-combustion method. The system exhibits a cubic spinel structure with a single phase in all the samples, which was confirmed using Rietveld refinement. Mixed morphology with agglomerated particles with nearly spherical/multi-faceted shapes was observed in FESEM studies. The elemental composition was confirmed from EDAX analysis. TEM images are in well accordance with FESEM images and reveals the crystalline nature of the synthesized samples. Magnetic properties of all the ferrites were studied using VSM. With the increase in the concentration Ni2+ the Cu1-xNixMn1.0Fe1.0O4 ferrite transform from ferrimagnetic character to a superparamagnetic character. The as-synthesized materials were further tested for their electrochemical and supercapacitor applications. The electrochemical measurements revealed that Cu1-xNixMn1.0Fe1.0O4 with (x = 0.75) exhibits superior electrochemical performance over the other samples. The high specific capacitance of 975 F g−1, the high energy density of 20.8 Whkg−1 at a scan rate of 5 mVs-1, and 94.4% capacity retention over 5000 cycles were observed for Cu1-xNixMn1.0Fe1.0O4 with a concentration of x = 0.75.

Frequency dependence studies of dielectric, impedance and permeability properties of Y3+ substituted Li0.5Zn0.1Ti0.1Fe2.3O4 ferrites

Polycrystalline ferrites having compositional formula Li0.5Zn0.1Ti0.1YxFe2.3-xO4 (x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by the conventional ceramic process. The sample’s XRD analysis indicated the formation of a single phase with a spinel structure. With the doping of Y3+ ions the lattice constant and the crystallite size were altered, the lattice constant increased with Y3+ doping which is due to the larger ionic radius of Y3+ as compared to Fe3+ and the crystallite decreases with the doping of Y3 ions which may be attributed to the size mismatch between Y3+ and Fe3+ ions. The room temperature dielectric and impedance properties were investigated with the change of frequency in the range of 500 Hz-5 MHz using an Impedance Analyzer (E4990A). The impedance studies showed the contribution of grain effect to the overall electrical response. The initial permeability measured for all the samples from 1 MHz to 20 MHz remained nearly constant except in the frequency range 11–16 MHz where initial permeability exhibited resonance. The results were analyzed and discussed in the paper.

Influence of Bi2O3-Nb2O5 additive on microstructure and magnetic properties of LiZn ferrites

As a composite additive, Bi2O3-Nb2O5 is promising for regulating the microstructure and magnetic properties of ferrite crystals. Hence, the material can be better used in the production of microwave RF devices. Herein, the influence of different mass fractions of Bi2O3-Nb2O5 additive on the microstructure and magnetic properties of LiZn ferrites, sintered at different temperatures, is systematically investigated. The properties of ferrite can be adjusted by adding appropriate additives. By adding 0.5 wt% Bi2O3 and sintering at 1050 °C, Li0.43Zn0.27Ti0.13Fe2.17O4 ferrites obtain a compact microstructure and a typical spinel structure. In addition, with the introduction of Bi2O3-Nb2O5 additive, the saturation magnetization intensity reaches a maximum value of 50.13 emu/g and the 4πMs value reaches 2907.22 Gauss. Meanwhile, the saturation magnetization intensity (Bs) of the sample reaches 311 mT, magnetic remanence (Br) reaches 248.4 mT and coercivity (Hc) decreases to 109.8 A/m. These results reveal that an appropriate amount of Bi2O3-Nb2O5 can regulate the microstructure and magnetic properties of LiZn ferrites, which shows well potential in the manufacture of microstrip line antennas, phase shifters and other microwave RF devices.

Broadband electromagnetic wave absorption of Ni0.5Zn0.5Nd0.04Fe1.96O4 ferrites modified by nano-silver particles

Ferrite materials have the potential to become excellent absorbing materials due to their high magnetic loss and good impedance matching. However, the disadvantages of high density and lack of dielectric loss capability limit its application. Herein, we used the citric acid sol-gel method and the self-propagating combustion method to prepare neodymium-doped nickel-zinc ferrite (NZNF), then the target effect of Sn2+ and an improved electroless silver plating process was used to plate a layer composed of silver nanoparticles (Ag NPs) with strong dielectric loss on the NZNF, and a magnetic/dielectric composite material (NZNF@Ag) with a heterogeneous structure was prepared. The number and particle size of Ag NPs on the surface of NZNF can be precisely controlled, thereby greatly enhancing the dielectric loss capability with little impact on the magnetic loss. The huge difference in conductivity between conductors and semiconductors promotes the occurrence of polarization at the heterogeneous interface and significantly enhances the electromagnetic wave absorption ability of the composite material. In the 2–18 GHz frequency band, the best sample can obtain an effective bandwidth of 6.82 GHz when the matching thickness is 2.1 mm. Combining conductors with semiconductor materials to obtain significantly enhanced interfacial polarization provides a new idea for improving the performance of wave absorbing materials.

TG, DSC, XRD, and SEM studies of the substituted lithium ferrite formation from milled Sm2O3/Fe2O3/Li2CO3 precursors

Formation of substituted lithium ferrite Li0.5SmxFe2.5–xO4 (where x = 0.06 and 0.2) from Sm2O3/Fe2O3/Li2CO2 precursors was studied by X-ray diffraction analysis, thermogravimetry, differential scanning calorimetry, and scanning electron microscopy. The mixture of powders was subjected to preliminary mechanical activation in a planetary mill. We analyzed samples based on the precursors and synthesized at 900 °C for 4 h in a laboratory furnace. It was found that ball milling of the precursors mixture in a planetary mill increases the powder reactivity. In spite of this, no substituted lithium ferrites were formed. It was shown that a two-phase composite that consists of pure lithium ferrite Li0.5Fe2.5O4 and SmFeO3 is formed during synthesis. An increase in the Sm2O3 content in the initial mixture provides an increase in the amount of the formed SmFeO3 phase. The synthesis of Li0.5Fe2.5O4 ferrite was confirmed by XRD analysis data, the Curie temperature (627–630 °C) measured using TG analysis in a magnetic field, and by the presence of an endothermic peak on the DSC curve corresponding to the order–disorder transition in the Li0.5Fe2.5O4 phase.