Nanocrystalline Cobalt Ferrite Research Articles

Effect of rare earth (Ho and Er) co-substitution on the magnetic and dielectric properties of nanocrystalline cobalt ferrites

Nanocrystalline cobalt ferrites co-substituted with rare earth Ho and Er (CoFe2-2xHoxErxO4, 0 ≤x≤0.10) have been synthesized via the sol-gel method. X-ray Diffraction (XRD) confirmed the single-phase spinel structure with reduced crystallite sizes (65 nm–12 nm), micro-strain (ε) and increased lattice constant (a) with Ho–Er co-substitution. Rietveld refinement and theoretical computation revealed Ho and Er occupancy at octahedral sites and Fe and Co ions redistribution between the tetrahedral and octahedral sites. Infrared spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray spectroscopy (EDX) and X-ray Photoelectron Spectroscopy (XPS) supported the formation of the desired spinel structure, aggregated spherical morphology, chemical stoichiometry and elemental states. Magnetic measurements showed a systematic decrease in saturation magnetization (Ms), magnetocrystalline anisotropy (K1), coercivity (Hc) and Curie temperature (Tc) with Ho–Er co-substitution. Electron Spin Resonance (ESR) exhibited asymmetric resonance peaks, reduced resonance field (Hr), linewidth (ΔHpp) and deviation in Lande g values. Impedance spectroscopy revealed two conduction mechanisms (holes and electrons) with distinct activation energies (EaI and EaII). Modulus spectrum analysis confirmed the thermally activated sample-electrode effects and the Nyquist plots indicated the dominant contribution of the grain boundary resistance to the conduction process. A notable enhancement in the dielectric constant (ε′) was observed with Ho–Er co-substitution. The ac conductivity (σac) followed the Jonscher Power Law (JPL). The temperature-dependent frequency exponent s(T), suggests the existence of two conduction mechanisms: non-overlapping small polaron tunneling (NSPT) and correlated barrier hopping (CBH).

Sol-Gel Route for the Synthesis of CoFe2-x Er x O4 Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications.

This study reports the formation of Er-doped nanocrystalline cobalt ferrite with the formula CoFe2–xErxO4 (0.0 ≤ x ≤ 0.10) from nontoxic metal precursors Co(NO3)2·6H2O, Fe(NO3)3·9H2O, and Er(NO3)3·5H2O through an easy and economical sol–gel route in which citric acid is served as the chelating agent. The as-prepared powder was annealed at 700 °C for 3 h in ambient air to get the required spinel structure. The annealed samples were subjected to structural and magnetic characterization. The X-ray diffraction (XRD) data of the samples confirmed the cubic spinel structure formation. The average crystallite size evaluated from XRD data increased from 21 to 34 nm with the substitution of Er due to the larger atomic size of Er3+ than Fe3+. Moreover, the crystallite size obtained from XRD data are well matched with the particle size measured from transmission electron microscopy images. The lattice parameters obtained from XRD data agree well with the values estimated from theoretical cation distribution and Rietveld refinement calculation. The hysteresis curve exhibits the particles are soft ferromagnetic and the coercivity increased from 54.7 to 76.6 kA/m with maximum saturation magnetization, Ms = 61 emug–1 for 0.10 Er content. The squareness ratios were found to be less than 0.5, which indicates the single-domain nature of our particles. The blocking temperature measured from field cooled-zero field cooled curves is TB > 350 K for all the samples, which is much higher than the room temperature (300 K). The enhancement of saturation magnetization and coercivity has been explained based on the crystallite size, anisotropy constant, and cation distribution. Thus, the structural and magnetic properties of CoFe2O4 nanoparticles (NPs) can be tuned by Er incorporation and these NPs can be applied in different soft magnetic devices.

A Brief Review on Structural, Morphological, Magnetic and Dielectric Behavior of Divalent Cation-substituted Nanocrystalline Cobalt Ferrite

Abstract: Spinel ferrites nanoparticles have received much more focus due to their promising applications in various technologies, such as magnetic refrigerators, microwave devices, colour imaging, high-density recording media and magnetic fluids. Nano-crystalline cobalt ferrite has been widely studied for its distinctive properties, like cubic magneto crystalline anisotropy, high coercivity, reasonable saturation magnetization, great chemical constancy, wear resistance and electrical insulation. Thus, cobalt ferrite has its own applications in the arena of high-frequency devices, magneto-optical devices, memory cores, recording media and spintronics and also in the biomedical sector, such as MRI, drug delivery schemes and magnetic hyperthermia. Reduced dimensionality of ferrite nanoparticles is having differences in properties when compared to its bulk counterparts. Size modulation of the physico-chemical properties of cobalt ferrite gives a distinctive response in the nanosized scale, permitting for material engineering in order to meet different necessities while addressing its different applications. The present study gives a brief review of significant effects on structural, dielectric and magnetic properties of cobalt spinel ferrite with different cation substitutions, like Mg2+, Ni2+, Zn2+, Cu2+, In2+ ...etc. This study regarding the size and its dispersity, core shell design, shape, crystallinity and surface decoration with hybrid derivatives opens up a wide variety of prospects for elementary studies as well as for growth and revolution in the field of ferrites. Keywords: Spinel ferrite, Structural properties, Microstructural properties, Magnetic properties, Dielectric properties.

Correlation between lattice strain and magnetic properties enhancement of nanocrystalline cobalt ferrite with controlled annealing

Correlation between lattice strain and magnetic properties enhancement of nanocrystalline cobalt ferrite with controlled annealing

Structural, Magnetic, Optical Properties and Photocatalytic Activity of Nanocrystalline Cobalt Ferrite Prepared by Three Different Methods

Cobalt ferrite (CoFe2O4) is an interesting material due to its rich physical properties. In order to study the influence of synthetic methods on the crystalline and morphological structure, optical and magnetic properties of the CoFe2O4, we synthesized here the CoFe2O4 by three different methods, including the chemical co-precipitation method, sol-gel method, and ceramic method. The resulting powders were characterized by different analyses: XRD, SEM, TEM, BET, FTIR, UV-Vis, PL, XPS, and surface acidity. The characterization results showed a significant variation in the structural, particle size, surface area, and optical properties of pure cobalt ferrite with changing the synthetic method. Both XRD and FTIR analyses confirm the formation of the cubic spinel phase, where the crystallite size changes from 21 to 36 nm. XPS analyses demonstrated the effect of the synthetic method on the cation distribution at the tetrahedral and octahedral sites in the spinel ferrite lattice. The magnetic properties of the prepared samples were studied at room temperature using the vibrating sample magnetometer (VSM) and found to be strongly dependent on the synthetic method and showed either ferromagnetic or super-paramagnetic character. The cobalt ferrite samples showed high photocatalytic activity against Basic Red 18 (BR 18) dye under visible light irradiation. The effects of particle size, surface areas, and morphology on the photocatalytic activity were discussed and the positive holes are suggested to be the major active species of the dye dissociation.

Structural, thermal, morphological, surface, chemical, and magnetic analysis of Al3+-doped nanostructured mixed-spinel cobalt ferrites

The effect of Al3+ substitution into nanocrystalline cobalt ferrite that was prepared via a thermal treatment method was investigated. The average ferrite nanoparticle diameters are found to be in the range between 5.86 and 15.91 nm when polyvinylpyrrolidone (PVP) was used as a capping agent. The importance of the thermal treatment process in capitulating as-produced aluminum-doped cobalt ferrite on the nanostructured scale is in excellent agreement with the results of structural, thermal, quantitative, dimensional and morphological characterizations, which included X-ray diffraction (XRD), particle size analysis, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX). The lattice strain and lattice constants were determined by employing the Scherrer and Williamson-Hall extrapolation methods. XRD pattern analysis was used to examine various structural characteristics, which included oxygen positional parameters, radii of octahedral and tetrahedral sites, hopping lengths, bond lengths and bond angles, site bonds, and edge lengths. The disparity in the theoretically anticipated bond angle demonstrates the enhancement of A-B superexchange interactions. This enhancement was supported by the results of Magnetic-Hysteresis (M − H) measured by vibrating-sample magnetometry (VSM) and X-ray photoelectron spectroscopy (XPS) studies. The XPS results demonstrated that iron is present as FeIII and cobalt is present as CoII. XPS analysis represents a powerful tool for investigating the composition, chemical state and inversion degree of doped cobalt ferrites, thereby contributing to the understanding of their properties. The reduction of both saturation magnetization (Ms) and remnant magnetization (Mr), which is demonstrated by the hysteresis loop that was obtained at room temperature (RT) with an ultimate magnetic field of 1.8 T, is due to spin noncollinearity and delicate interactions among sublattices.

The Significance of Buffer Solutions on Corrosion Processes of Cobalt Ferrite CoFe2O4 Thin Film on Different Substrates.

The spinel ferrite nanoparticles, such as zinc, nickel, and cobalt ferrites have exceptional electronic and magnetic properties. Cobalt ferrite nanomaterial (CoFe2O4) is a hard material that reveals high magnetic, mechanical, and chemical stability. The objective of this research is to predict the corrosion behavior of cobalt ferrite (CoFe2O4) thin films deposited on different substrates (platinum Pt, stainless steel S.S, and copper Cu) in acidic, neutral, and alkaline medium. Cobalt ferrite thin films were deposited on platinum, stainless steel, and copper via electrodeposition-anodization process. After that, corrosion resistance of the prepared nanocrystalline cobalt ferrite on different substrates was investigated in acidic, neutral, and alkaline medium using open circuit potential and potentiodynamic polarization measurements. The crystal structure, crystallite size, microstructure, and magnetic properties of the ferrite films were investigated using a combination of XRD, SEM and VSM. The results of XRD revealed a cubic spinel for the prepared cobalt ferrite CoFe2O4. The average size of crystallites was found to be about 43, 77, and 102 nm precipitated on platinum, stainless steel, and copper respectively. The magnetic properties of which were enhanced by rising the temperature. The sample annealed at 800oC is suitable for practical application as it showed high magnetization saturation and low coercivity. The corrosion resistance of these films depends on the pH of the medium as well as the presence of oxidizing agent. Depending on the obtained corrosion rate, we can recommend that, CoFe2O4 thin film can be used safely in aqueous media in neutral and alkaline atmospheres for Pt and Cu substrates, but it can be used in all pH values for S.S. substrate.

A novel synthesis route to obtain magnetic nanocrystalline cobalt ferrite with photo-Fenton activity

A novel unconventional coprecipitation procedure (UCP) followed by a simple and fast microwave-assisted hydrothermal (MAH) treatment was used to synthesize a new nanocrystalline magnetic cobalt ferrite (CoFe2O4/MAH) with photo-Fenton activity. The Co-ferrite nanoparticles were obtained at room temperature in the absence of surfactants and their photo-Fenton activity was evaluated through lignin degradation. It was found that microwave hydrothermal treatment is mandatory to obtain magnetic and photoactive Co-ferrite. According to XRD Rietveld refinements and FTIR, the photoactivity was mainly attributed to the Co2+ cation migration from octahedral to tetrahedral sites in the ferrite structure during the MAH treatment, leading, consequently, to a higher Fe3+ incorporation at octahedral sites, which strongly participate in the photo-Fenton degradation mechanism. The magnetic property of the CoFe2O4/MAH ferrite nanoparticles was confirmed by magnetometry and provided an easy catalyst separation.

Change of structural and magnetic property due to zinc substitution and sintering temperature of nano-crystalline Cobalt ferrite

ABSTRACTCo1–xZnxFe2O4 (x = 0.2, 0.4, 0.6 and 0.8) were synthesized using typical wet chemical co-precipitation technique. The ferrite specimen have been sintered at 700°C and 900°C for three hours in air. X-ray diffraction (XRD) diffractogram and Mössbauer spectroscopy technique were employed to describe the nano-ferrites. The single-phase spinel cubical structure was confirmed from XRD studies. Employing vibrating sample magnetometer (VSM), saturation magnetization, remanent magnetization, etc. have been determined. The value of coercivity confirmed that all the samples were soft ferrites. Ferromagnetic to superparamagnetic transition has been seen by Mössbauer spectroscopy. Complex permeability has been determined using an impedance analyzer. The real and imaginary part of initial permeability along with loss tangent was, and loss tangent was calculated within the frequency range 1 kHz to 120 MHz. It shows the constant value at the high-frequency range that is identical properties for the ferrite samples to apply the materials for storage device applications.

Nanocrystalline Cobalt Ferrite Powders by Spray Solution Combustion Synthesis

Nanocrystalline cobalt ferrospinel powders were prepared by spray solution combustion synthesis (SSCS) and their structural and magnetic properties were characterized by mathematical modeling and experimentally. The magnitude of specific saturation magnetization of the synthesized materials was somewhat higher than that typical of bulk materials whereas the field of magnetocrystalline anisotropy and Curie temperature, noticeably smaller.

Dielectric, impedance, AC conductivity and low-temperature magnetic studies of Ce and Sm co-substituted nanocrystalline cobalt ferrite

Abstract In this study, we report frequency and temperature dependent dielectric, electrochemical impedance and low temperature magnetic properties of Sol-gel auto-combustion synthesized rare-earth (Ce and Sm) co-substituted cobalt ferrite, CoCexSmyFe2-x-yO4 (x = y = 0.00, 0.1, 0.12 and 0.25). The surface morphology and particle size as obtained by XRD studies was confirmed by HRTEM measurements for a representative sample. The dielectric properties such as dielectric constant, loss tangent and AC conductivity have been measured using LCR meter, variation of dielectric parameters with substituent concentrations, frequency range from 0.1 to 10 MHz at room temperature (RT) and temperatures 100–400 °C have been well supported by Maxwell-Wagner interfacial polarization. The AC conductivity increased with applied frequency suggesting that the conduction mechanism is owing to small polaron hopping between cations. Impedance studies shows that, the addition of RE (Ce and Sm) cause a decrease in the Z′ value, with increasing frequency which can be attributed to the space charge polarization effect in the material. Low temperature magnetic measurements in ZFC-FC mode and magnetic isotherms at 20 and 310 K reveals the ferromagnetic nature of RE (Ce, Sm) substituted cobalt ferrite nano particles. The coercive field has been increased at low temperature 20 K compared to that at 310 K, the samples shows super paramagnetism beyond room temperature.

Effects of Zn2+-Zr4+ ions on the structural, mechanical, electrical, and optical properties of cobalt ferrites synthesized via the sol–gel route

In the present study, we examined the effects of doping with Zn–Zr on the structural, optical, electrical, and mechanical properties of cobalt ferrite. Nanocrystalline cobalt ferrites comprising CoZnxZrxFe2-2xO4 (x = 0.0 to 0.4, Δx = 0.1) were prepared via the sol–gel route. X-ray diffraction analysis indicated the formation of a spinel phase in the ferrites. An additional ZrO2 phase was observed for x = 0.3. Characteristic absorption bands at frequencies of 580–610 cm−1 and 375–400 cm−1 related to spinel structures were observed in the Fourier transform infrared FTIR spectra obtained for the ferrites. The elastic constants decreased as the Zn–Zr contents increased. The longitudinal and shear velocities of ultrasound through the ferrite materials were measured using the ultrasonic pulse transmission method. The variations in the ultrasound velocities could be attributed to the changes in density. The dielectric parameters ɛ′ (dielectric constant) and tanδ (dielectric loss tangent) were analyzed as functions of the frequency and Zn–Zr composition. Both ɛ′ and tanδ decreased as the frequency and Zn–Zr contents increase. The variations in the values of parameters ɛ′ and tanδ were explained using Maxwell–Wagner interfacial polarization according to Koops phenomenological theory. The values of the activation energy and Curie temperature were calculated based on plots of the thermal variation in the direct current resistivity. The activation energy values indicated that electron hopping was the mechanism responsible for conduction in the ferrites.

Structure, Morphology, Cation Distribution and Magnetic Properties of Cr3+-Substituted CoFe2O4 Nanoparticles

The present investigations deal with the effect of trivalent chromium ions (Cr3+) on structural and magnetic properties of nanocrystalline cobalt ferrite (CoFe2O4) nanoparticles. The samples of CoCrxFe2−xO4 (where x = 0.0 to 1.0 in step of 0.2) were successfully synthesized by citric acid-assisted sol-gel auto combustion method. Further, the prepared samples were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR) and pulsed field hysteresis loop technique for structural, morphological and magnetic properties analysis, respectively. XRD patterns showed the formation of single-phase cubic spinel structure with broad Bragg’s peak for all the samples. The value of lattice parameter was found to be decreased with chromium substitution x. Cation distribution studies revealed that Co2+ and Fe3+ occupied both A and B sites, whereas Cr3+ ions occupied only B site. SEM analysis of the prepared samples confirmed the nanocrystalline nature of the material. The two absorption bands belonging to spinel structure were observed in IR spectra. Saturation magnetization (MS), remanence magnetization (Mr) and coercivity (HC) was found to be decreased with increase in chromium substitution x.

Evaluation of structural and dielectric properties of Al, Ce co-doped cobalt ferrites

The structural and electrical properties of undoped CoFe2O4 and Co1−xAlxFe1.8Ce0.2O4 (x = 0.3, 0.4 and 0.5) samples synthesized by sol-gel method is reported in this paper. The prepared ferrites were found to crystallize in cubic spinel structure as confirmed by x-ray diffraction study. Al substitution has resulted in appreciable decrease in the crystallites size. The dielectric constant (ε′), dielectric loss factor and AC conductivity of nanocrystalline cobalt ferrites were investigated as a function of frequency. Co0.95Al0.5Fe1.8Ce0.2O4 sample is found to exhibit better dielectric properties compared to the other doped and undoped CoFe2O4, Impedance spectroscopy was utilized to analyze the microstructural contribution towards conduction, which confirms the dominance of the grain boundary effect. It is observed that increase in Al doping results in decrease of impedance z′ owing to the relaxation process. Reduced dielectric loss values were observed for these ferrites. Thus Al-Ce doped cobalt ferrites with low loss find potential application in high frequency read/write memory devices.

Effect of yttrium doping on structure, magnetic and electrical properties of nanocrystalline cobalt ferrite

Tailoring of properties by changing morphology or by doping is very much required for the suitable application of any materials. Here we report the effect of yttrium doping on microstructure, magnetic and electrical properties of cobalt ferrite nanoparticles prepared through citrate auto-ignition method. Rietveld refinement analysis of X-ray diffraction pattern confirms the growth of pure and single phase cobalt ferrite nanoparticles which corroborates with transmission electron microscopy (TEM) study. Microstructural parameters, obtained from Rietveld analysis showed that oxygen vacancy is maximum and inter-ionic bond lengths and bond angles attain optimum values for 15 mol% yttrium doped sample. An observed value of saturation magnetization indicates the existence of spin canting phenomenon which was explained by Yafet-Kittel model. Magnetic parameters such as anisotropy constant, anisotropy field have been estimated using Law of Approach (L.A.) formalism. Existence of interparticle dipolar interaction (IPDI) in the system was established with the help of Mr/Ms ratio around room temperature. Maximum electrical conductivity has been observed for the 15 mol% doped sample as estimated from Mott’s 3-D V.R.H. model, which can be attributed to the optimum values of microstructural parameters at this composition.

Strain induced magnetism and superexchange interaction in Cr substituted nanocrystalline cobalt ferrite

Distribution of magnetic relaxation time using Mössbauer spectroscopy has been observed for CoFe2-xCrxO4 (0.1 ≤ x ≤ 0.4) annealed at lower temperature (≤400 °C). The estimated cation distribution over A and B sites observed by Mössbauer spectroscopy is consistent with that obtained by the Rietveld analysis of the X-ray diffraction patterns. Saturation magnetization and magnetocrystalline anisotropy constant increase up to 20% of Cr (x = 0.2) substitution and, decrease with further increase of x. However, the coercive field as well as the Néel temperature decreases with increase in Cr3+ concentration, i.e., a crossover from the hard magnetic to soft magnetic nature by Cr substitution at the Fe site of CoFe2O4 has been observed. This behavior is attributed to the competition between strain induced magnetism and superexchange interaction between cations.

Structural and Mössbauer study of nanoparticles CoFe2O4 prepared by sol-gel auto-combustion and subsequent sintering

Single-phased nanocrystalline Cobalt ferrite (CoFe2O4) have been synthesized by sol-gel auto-combustion method. The prepared sample was divided into four different samples (auto-combustion (S1), 400 ∘C (S2), 600 ∘C (S3), and 1000 ∘C (S4)). The effect of sintering temperature on the structure, and morphology, were subsequently evaluated by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM). The hyperfine Interactions of all samples were studied using Mossbauer Spectroscopy (MS). No significant changes noticed in lattice constant (a), and the crystallite size was found to increase with sintering temperature which can be attributed to the grain growth of the particles. SEM shows an increase in the grain size and crystallinity as the sintering temperature increases, and the particles are cubic-like for S4. The particle size of each sample was determined using TEM and were in the range of 10–70 nm for the first three samples S1, S2, and S3, and increased beyond the nano-sized limit for S4 sample. The 57Fe Mossbauer spectra at 295 K and 78 K showed two sets of magnetic hyperfine patterns for all the four samples, indicating the presence of Fe3+ in both A and B-sites, with superimposed doublet in each of S1 and S2 samples. This doublet shows a significant reduction in intensity with increasing the sintering temperature. The existence of the doublet at 78 K suggests that the blocking temperature is below 78 K temperature. From the intensity of the Fe3+ sites and assumed site occupancies of the Co2+ ions, it may be deduced that the paramagnetic doublet is associated with octahedral site.

Structural, morphological, magnetic properties and cation distribution of Ce and Sm co-substituted nano crystalline cobalt ferrite

Rare earth Sm and Ce co-substituted nano crystalline cobalt ferrite, CoFe2-x-ySmxCeyO4 (x = y = 0.00, 0.5, 0.1, 0.12 and 0.25) have been synthesized by sol-gel combustion method to study structural, morphological and magnetic properties. X-ray diffraction (XRD) revealed the spinel structure with a secondary phase of RE2O3 for higher molar concentration of rare earth ions. Williamson-Hall equation used to determine crystallite size and strain produced. An increase in specific surface area and Strain, while a decrease in the crystallite size were observed with increasing Sm and Ce concentrations. Scanning electron microscopy (SEM) micrographs showed inhomogeneous grain distributions with some agglomerates, an average grain size was found to be 0.15 μm. Energy dispersive x-ray spectroscopy (EDAX) confirmed the stoichiometry of the samples. Surface morphology studies were carried out by Transmission electron microscopy (TEM) studies which corroborates the presence of agglomerations in the sample. Fourier transform infrared spectroscopy (FTIR) spectra confirmed the spinel phase by showing two frequency bands υ1 in frequency range 580-559 cm−1 and lower frequency band υ2 at 392-372 cm-1. The force constants calculated for tetrahedral position was found to be more than that of octahedral position. Based on structural properties a cation distribution was proposed. Vibrating sample magnetometer (VSM) technique at room temperature used to study the magnetic properties, saturation magnetization (Ms), coercivity (Hc), anisotropy constant and initial permeability. Ms and Hc were found decreasing with increasing concentration of rare earth ions which has been attributed to weakening of A-B interaction, due to decrease in particle size and surface effect. Yafet-Kittle (YK) angle was found increasing with rare earth concentrations. The Ms and Hc of cobalt ferrite particles can be tailored for various applications.

Tailoring The Phase, Microstructure And Magnetic Properties Of Nanocrystalline Cobalt Ferrite

The phase analysis of combustion prepared cobalt ferrite is investigated in detail. Phase analysis was discussed in detail with the combustion of the gel to amorphous natured cobalt ferrite. The evolution of phase with respect to the calcinations was discussed in detail with thermal analysis. The cubic phase was indexed through powder X-ray diffraction analysis. The particle sizes of nanocrystalline cobalt ferrite (CoFe2O4) were found to be of the order of 50 nm. The detailed micro and nanostructure phase was visualized through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Vibrating sample magnetometer (VSM) was used to determine the magnetic nature of the sample. The B-H curve for the synthesized nanocrystalline cobalt ferrite is discussed in detail in the present investigation.

Synthesis, characterization and electrical properties of mesoporous nanocrystalline CoFe2O4 as a negative electrode material for lithium battery applications

Mesoporous nanocrystalline cobalt ferrite (CoFe2O4) as a negative electrode material for lithium battery was prepared by using simple urea assisted modified citrate combustion process. Formation of pure crystalline phase and nanocrystallite size were respectively identified and calculated from the analysis of the observed X-ray diffractometer pattern of the CoFe2O4 sample. The formation of uniform mesoporous nanocrystalline architecture was confirmed from the observed FE-SEM images of the CoFe2O4 sample. Specific surface area obtained from BET analysis of the sample is found to be 38.369 m2 g−1. The delivered discharge capacity of the lithium ion battery, fabricated using prepared mesoporous nanocrystalline CoFe2O4, is found to be 484 mAh g−1 after 30 cycles at 0.1 C rate. The observed high discharge capacity may be due to the unique mesoporous nanocrystalline structure of the CoFe2O4 sample. Hence, the electrochemical results reveal that the mesoporous nanocrystalline CoFe2O4 could be a promising high capacity, negative electrode material for lithium ion batteries.