Selected Area Electron Diffraction Patterns Research Articles

Solution combustion synthesis of Dy-doped ZnO nanoparticles: An investigation of their structural, optical and photoluminescence characteristics

Undoped and Dy-doped ZnO nanoparticles were synthesized by solution combustion technique using urea as fuel. The synthesized nanoparticles were examined by various characterization tools for their structural, optical and photoluminescence properties. All the nanoparticles are found to possess the hexagonal wurtzite structure of ZnO with crystallite sizes in the range of 16–23 nm. The structural parameters viz. lattice constants, bond lengths, bond angles, and lattice strain of the nanoparticles have been evaluated. The high-resolution transmission electron micrographs and selected area electron diffraction patterns confirm the high crystallinity of the nanoparticles. The optical bandgap estimated from the diffuse reflectance spectra using the Kubelka-Munk method is found to be 2.90 eV for the undoped ZnO. A sharp narrow UV emission peak at ∼396 nm originating from the excitonic recombination is observed in the PL spectra of all the nanoparticles. The visible emission peaks in the PL spectra of undoped ZnO are attributed to different native defects, whereas in Dy-doped ZnO nanoparticles, the visible emissions (blue, yellow and red) are assigned to the 4f intrashell transitions in Dy3+ ions. It has been concluded that the solution combustion synthesized 5 mol% Dy-doped ZnO can be a promising material for white luminescence applications.

PEG functionalized ZnO nanoparticles by fusion of precipitation-cum-hydrothermal method with enhanced photocatalytic activity

In this study, polyethylene glycol (PEG)-aided zinc oxide (ZnO) nanoparticles (NPs) have been synthesized by fusion of precipitation-cum-hydrothermal method. The PEG/ZnO NPs were investigated by x-ray diffraction (XRD), Fourier-transform infrared (FTIR) transformation, UV-visible field emission scanning electron microscope (FESEM), energy dispersive x-ray, high resolution transmission electron microscope (HRTEM), and RAMAN techniques. XRD analysis confirms the formation of the wurtzite phase with a crystallite size of 8 nm of synthesized PEG/ZnO. While FESEM and HRTEM investigations reveal the formation of distinct structural forms, FTIR investigations show interactions between PEG and ZnO. High crystallinity of PEG/ZnO is observed in the selected area electron diffraction pattern. The Brunauer–Emmett–Teller (BET) study revealed that ZnO NPs have a mesoporous structure with a significant specific surface area of 42 m2 g−1. The evaluation of photocatalytic activity of PEG/ZnO-based photocatalyst was carried out via the degradation of typical azo dye (industrial methylene blue (MB) dye) along with total organic carbon (TOC) analysis. The PEG-ZnO (dose 200 mg l−1) was found to be an efficient photocatalyst for the degradation of MB dye. The degradation reaction exhibits pseudo-first-order kinetics. Additionally, TOC removal was monitored, elucidating almost complete mineralization.

Thickness tuneable dielectric, optical and magnetic response of lithium ferrite thin films deposited by pulsed laser deposition

Spinel ferrite thin films are in demand for efficient device applications due to their promising properties. So, improvement of their magnetic and dielectric behavior for miniaturizing devices is necessary. The lithium ferrite thin films (single phase with a spinel structure space group - P4132) are deposited at 700 °C on Pt(111)/Ti/SiO2/Si and quartz substrates with different thicknesses. The calculated d – spacing of 240 nm from the selected area electron diffraction pattern is in good agreement with the X-ray diffraction results. X-ray photoelectron spectroscopy confirmed the presence of Li, O, and other valance states of Fe ions. The microstructure of the films revealed the formation of uniform grains with well-separated grain boundaries. Further, the root-mean-square surface roughness is decreased from 11 nm (160 nm) to 9 nm (240 nm) and increased only for 300 nm. The optical bandgap is found to be in the range of 2.58 ‒ 2.30 eV and decreaded with the increase in film thickness. The saturation magnetization in-plane and out-of-plane is reduced monotonically with an increase in thickness attributed to the decrease in the compressive strain. The coercivity increased with the increase in film thickness. The dielectric constant improved, whereas dielectric loss decreased with an increase in thickness. The impedance spectra revealed the contribution of grain boundary is reduced with the increase in film thickness and is analyzed using the equivalent circuit model. The involved conduction process is well fitted with the Mott's variable range hopping mechanism. The obtained results demonstrate that desired response can be obtained by tailoring the film thickness for the microwave and magnetic devices such as magnetic oxide semiconductor.

An investigation on the structural and optical properties of mercaptosuccinic acid capped cadmium telluride quantum dots

In this work, a sonication induced modified wet chemical approach is adopted to synthesize highly luminescent and water soluble cadmium telluride (CdTe) quantum dots (QDs). The morphology, size, crystal structural, and optical properties of CdTe QDs are investigated for different refluxing time (1–4 h). The refluxing time-dependent optical constants viz. band gap energy and Urbach energy of the QDs are estimated from UV–Visible absorption spectra. The optical band gap energy decreased from ~ 2.12 to 1.92 eV and the Urbach energy increased from ~ 361 to 487 meV, with the increase in refluxing time. CdTe QDs are found to be uniform in size. The average size of the QDs estimated from the High Resolution Transmission Electron Microscope image analysis is about 5.8 and 8.2 nm for refluxing times 1 and 4 h, respectively. The growth mechanism of the QDs as a function of refluxing time has also been discussed. The fluorescence spectra of the QDs, revealed emission peaks having wavelength from ~ 534 to 585 nm, under the excitation wavelength of 320 nm. The fluorescence emission peaks showed a bathochromic shift with increasing refluxing time. CdTe QDs also exhibit excitation-dependent fluorescence behaviour. Two crystalline phases of the CdTe QDs, namely hexagonal and cubic are confirmed from the High Resolution Transmission Electron Microscope images and Selected Area Electron Diffraction patterns analysis. The phase transformation from hexagonal to cubic is successfully achieved by tuning the refluxing time from 1 to 4 h.

Investigation of magnetic behavior of non-stoichiometric Co1.75Mn0.5Fe0.75Si and Co1.5MnFe0.5Si compositions associated with their Co2FeSi and Co2MnSi parent alloys

Full Heusler Co2MnSi and Co2FeSi alloys have demonstrated half-metallic behavior with their ferromagnetic ground state having magnetic moments of ∼ 5.0 μB/f.u. and ∼ 6.0 μB/f.u. respectively with Curie temperature around 1100 K. In this article, we have investigated the magnetic properties of non-stoichiometric Co1.75Mn0.5Fe0.75Si and Co1.5MnFe0.5Si quaternary Heusler alloys. X-Ray diffraction measurement for both samples has revealed the signature of quaternary LiMgPdSn prototype parent phase structure (Space group-F-43 m, 216) manifested with the super-reflection peaks (111 and 200) and high intense peak (220). Interestingly, inter-martensitic phase has been observed in the Co1.5MnFe0.5Si sample even at room temperature as indicated by the 7M modulated peaks in the XRD pattern. Transmission electron microscopy (TEM) along with selected area electron diffraction pattern of both the alloys has also exhibited the FH parent phase. Magnetic measurements have been performed to reveal the magnetization variation with the applied magnetic field (M−H) which exhibited the saturation of magnetization of both the samples around ± 1.5 Tesla magnetic field. Zero field cooled (ZFC) and field cooled (FC) data have been taken via cooling down these samples from 300 K to 5 K temperature in the zero and 0.5 Tesla field respectively which revealed few meta-magnetic transitions such as martensitic and inter martensitic transition in the magnetization versus temperature curve.

Giant Anisotropy of Charge-to-Spin Conversion in Fe Films with Fourfold-Symmetric Anisotropy

Manipulating charge-to-spin conversion in a single magnetic layer holds great promise for optimizing efficiency of spintronic devices. Here we present experimental evidence uncovering a giant conversion anisotropy of up to 400% in fourfold-symmetric anisotropy $\mathrm{Fe}$ films on $\mathrm{Mg}\mathrm{O}(100)$ substrate by changing the direction of applied radio frequency microwave currents from the magnetic hard axis to the easy one. Together with the anisotropy of Gilbert damping and anisotropic magnetoresistance, the fourfold-symmetric anisotropy is found to stem from large emergent spin-orbit coupling in $\mathrm{Fe}$ films with local lattice distortions, which is further confirmed by selected area electron diffraction patterns in different regions. Given that $\mathrm{Fe}$ films are deposited by magnetron sputtering at room temperature, our results suggest a simple route for designing future energy-efficient magnetic devices for mass production.

Effect of Ag content on the nanostructure and antimicrobial activity of CeO2.

The morphological and antibacterial effects of CeO2 nanoparticles (NPs) with different amounts of Ag precursor were studied. The samples were synthesized with different percentages of silver nitrate content by co-precipitation method. The cerium nitrate hexahydrate was a precursor of Ce reagent, polyvinylpyrrolidone as dispersant agent, and ammonium hydroxide as a precipitating agent. The obtained particles were annealed at 400°C and characterized by X-ray diffraction, scanning electron microscope (SEM), transmission electron microscopy (TEM), and N2 physisorption. The particles show high crystallinity, whose size decreases slightly by the effect of Ag precursor incorporation. These particle morphologies studied by SEM and TEM revealed the spherical shape of CeO2 NPs. Furthermore, the Ag particles were observed with a size of around 30nm. Selected area electron diffraction patterns confirm the cubic structure of CeO2, also the cubic structure of Ag particles. Besides, it was determined that Ag incorporation has no significant influence on the textural properties of NPs. In addition, the antibacterial activity was evaluated against gram-negative and gram-positive microorganisms. The quantitative results showed that the antimicrobial activity increased depending on the Ag amount incorporated, reaching up to 99.999% of the growing reduction rate.

PbS quantum dots-sensitized ZnO nanorods-based third generation solar cells

PbS quantum dots (QDs) and PbS QDs-sensitized ZnO nanostructures of rod-like shape have been synthesized by the successive ionic layer adsorption and reaction method. The optical absorption spectra PbS QDs indicate that the prepared sample exhibits significant visible light absorption. The light absorption of PbS QDs-sensitized ZnO nanorods (NRs) was higher than bare ZnO NRs. X-ray diffraction pattern of PbS QDs exhibits diffraction peaks corresponding to (200), (112), and (202) planes of PbS. A Uniform development of ZnO nanostructures of rod-like shape and the PbS QDs deposition over its surface was witnessed from the field-emission scanning electron microscope and transmission electron microscope images. The small ring pattern confirming the polycrystalline nature of the prepared PbS thin film was observed from the selected area electron diffraction pattern. Solar cells were made using PbS QDs-sensitized ZnO NRs as photoanodes and it exhibited a power conversion efficiency of 1.2%.

Effects of aluminum addition on microstructures and mechanical properties of NbTiVZr high-entropy alloy nitride films

In this study, the effects of Al addition on the phase evolution, morphology and mechanical properties of (NbTiVZrN)100-xAlx (x = 0, 0.7, 2.3, 3.6, 4.0) high-entropy alloy nitride films (HEANFs) were investigated. The films were prepared by co-sputtering of NbTiVZr alloy target and Al target with a constant N2/Ar flow ratio. The XRD patterns revealed FCC structure and the preferred orientation transferred from TiN(200) to (Nb, Zr)N(111) as the Al content increased. The results of the corresponding selected-area electron diffraction patterns agreed well with the XRD results. Cross-sectional SEM and TEM observations exhibited ultra-fine columnar structure. The nanoindentation test was performed to acquire the mechanical properties of the films. The hardness, reduced modulus and fracture toughness of nitride film increased with the increasing Al content and reached the maximum values of 28.1 GPa, 253 GPa and 2.08 MPa × m0.5, respectively, at x = 3.6. The significant improvement could be ascribed to solid solution strengthening, inverse Hall-Petch effect and the replacement of dominant nitride compounds. As the Al content increased from 0 to 4 at.%, the coefficient of friction decreased from 0.082 to 0.065. The relationship among the composition, structure and mechanical properties was studied for the (NbTiVZrN)100-xAlx HEANFs in this work. Comparisons with (NbTiVZr)100-xAlx HEAFs without nitridation and other nitride films were also made.

Energetic Electron-Assisted Synthesis of Tailored Magnetite (Fe3O4) and Maghemite (γ-Fe2O3) Nanoparticles: Structure and Magnetic Properties.

Iron oxide nanoparticles with a mean size of approximately 5 nm were synthesized by irradiating micro-emulsions containing iron salts with energetic electrons. The properties of the nanoparticles were investigated using scanning electron microscopy, high-resolution transmission electron microscopy, selective area diffraction and vibrating sample magnetometry. It was found that formation of superparamagnetic nanoparticles begins at a dose of 50 kGy, though these particles show low crystallinity, and a higher portion is amorphous. With increasing doses, an increasing crystallinity and yield could be observed, which is reflected in an increasing saturation magnetization. The blocking temperature and effective anisotropy constant were determined via zero-field cooling and field cooling measurements. The particles tend to form clusters with a size of 34 nm to 73 nm. Magnetite/maghemite nanoparticles could be identified via selective area electron diffraction patterns. Additionally, goethite nanowires could be observed.

Irradiation-induced phases in an Fe ion irradiated CLAM steel

CLAM (HEAT-9) steel samples were subjected to a standard heat treatment involving a normalizing for 0.5 h at 980 °C and a tempering for 1.5 h at 760 °C. The standard heat-treated steel samples were irradiated with 3.5 MeV Fe13+ ions at 400 °C to 0.53 dpa and 0.61 dpa. The precipitate phases of standard heat-treated steel samples and the irradiated steel samples were observed and analyzed using transmission electron microscopies and energy dispersive X-ray spectrometers. Through the analyses of selected-area electron diffraction pattern and energy dispersive X-ray data of thin foil specimens, the effects of irradiation on the main inherent precipitate phases, Cr-rich M23C6 and Ta-rich MX, in standard heat-treated steel were investigated, and three kinds of phases induced by the irradiation were found in the irradiated steel. After irradiation, Cr-rich M23C6 and Ta-rich MX phases were observed and confirmed to be still present in the steel, but the Cr/Fe ratio and W content in the Cr-rich M23C6 precipitates decreased obviously. These three irradiation-induced phases in the irradiated steel were identified as Fe-rich M3C carbide with a simple orthorhombic crystal structure, sigma-FeCr intermetallic compound with a body-centered tetragonal crystal structure, and Fe-Cr binary intermetallic compound with a body-centered cubic crystal structure. The identified Fe-rich M3C/sigma-FeCr/Fe-Cr phases have a metal element composition of 92–98Fe and 2–8Cr/85–95Fe and 5–15Cr/40–90Fe and 10–60Cr (in at.%), and a size range of 80–190/60–190/70–300 nm, respectively. The formation of these three irradiation-induced phases in the steel are also discussed.

Effect of (Ce, Dy) co-doping on the microstructural, optical and photoluminescence characteristics of solution combustion synthesized ZnO nanoparticles.

Solution combustion synthesized ZnO nanoparticles with Ce, Dy doped and co-doped with varying dopant concentrations were characterized for their microstructural, optical and photoluminescence characteristics. The synthesized nanoparticles have been found to match the standard hexagonal wurtzite structure of ZnO. The lattice fringes in the high-resolution transmission electron micrographs and the bright spotty rings in the selected area electron diffraction pattern authenticate the high crystallinity of the nanoparticles. The diffuse reflectance spectroscopy provides the energy bandgap for the undoped ZnO to be 3.18 eV, decreasing upon doping and co-doping. A sharp narrow UV emission peak at ~ 398 nm originating from the excitonic recombination is found in the PL spectra of the nanoparticles. The visible emission peaks in the PL spectra are assigned to f-d and f-f electron transitions of Ce3+ and Dy3+ ions, respectively, in addition to different native defects in ZnO. The visible emissions (blue, yellow and red) have been found to improve upon (Ce, Dy) co-doping, and therefore (Ce, Dy) co-doped ZnO nanoparticles can be considered as a promising luminescent material for the development of energy-saving light sources.

Dynamic tilting in perovskites.

A new computational analysis of tilt behaviour in perovskites is presented. This includes the development of a computational program - PALAMEDES - to extract tilt angles and the tilt phase from molecular dynamics simulations. The results are used to generate simulated selected-area electron and neutron diffraction patterns which are compared with experimental patterns for CaTiO3. The simulations not only reproduced all symmetrically allowed superlattice reflections associated with tilt but also showed local correlations that give rise to symmetrically forbidden reflections and the kinematic origin of diffuse scattering.

Effect of harmonic structure on the electrochemical behavior of high entropy Cantor alloy in NaCl solution

The present work discusses the effect of harmonic structure on the corrosion behavior of high entropy Cantor alloy (Fe20Cr20Mn20Ni20Co20) in freely aerated 3.5 wt% NaCl solution. A harmonic structure featuring a continuous shell region with an average grain diameter of ∼3 μm and discreet core regions with an average grain diameter of ∼25 μm is developed in the Cantor alloy. The X-ray diffraction patterns, transmission electron microscopy and selected area electron diffraction patterns confirm the presence of face-centered cubic phase indicating that no second phase formation occurs in the shell or core regions. Its electrochemical behavior has been studied and compared with a conventional Cantor alloy, harmonic-structured 304L stainless steel, and maraging steel. The studies conclude that the harmonic-structured Cantor alloy shows the highest corrosion resistance among the tested materials. A novel mechanism for the corrosion of the harmonic-structured Cantor alloy suggests that the excellent corrosion-resistive properties are attributed to the early passivation by enrichment of Cr in the oxide layer in its shell region and reversal of polarity due to the early passivation during corrosion.

The influence of the synthesis method on Gd2O3 morpho-structural properties and sensitivity to CO2 under in-field conditions

In this study, we report the implications of the synthesis method on Gd2O3 sensitivity to CO2. The rare-earth oxide was prepared by wet chemical co-precipitation and by hydrothermal method. The obtained powders labelled Gd2O3–CoP and Gd2O3-HT were deposited as thick films over commercial Al2O3 substrates provided with Pt electrodes and a back-side heater. Both powders consist of the same crystallographic phase, with a significant difference appearing in selected area electron diffraction patterns, transmission electron microscopy images at higher magnification and X-ray diffraction spectra, with respect to the crystallization degree. The associated role in sensing properties is revealed via electrical resistance variations determined by CO2 concentrations in the range between 400 and 3000 ppm and variable relative humidity between 0 and 50%RH, similar to the in-field atmosphere. The proposed CO2 interaction mechanism is based on phenomenological investigations which highlight the electronic affinity variation as the effect of dipoles induced by the in-field conditions on the Gd2O3 surface.

High energy mechanical-milling induced modifications in structural and microstructural properties of Gd2Zr2O7

A polycrystalline sample of gadolinium zirconate (Gd2Zr2O7) was synthesized through a solid-state reaction route (unmilled sample) and then subjected to high-energy ball-milling for 6 hrs and 18 hrs duration (milled samples). Interestingly, elemental analysis of the samples indicates the gradual reduction in the atomic percentage of Gd and Zr cations while significant enhancement in oxygen atomic percentage with the milling process. Rietveld refinement of X-ray diffraction patterns suggests that all samples possess defect fluorite structure and the values of the goodness-of-fit parameter improve from 3.88 for the unmilled sample to 1.85 for 18 hrs milled sample. The diffraction pattern of 18 hrs milled sample showed reflections from the ordered pyrochlore phase. The formation of the disordered fluorite phase is owing to the preparation temperature and the ionic radius ratio, r(Gd3+)/r(Zr4+) = 1. 46. Transmission electron micrographs, and selected area electron diffraction patterns analysis confirm the nanophasic nature of the milled samples, and particle size is found to reduce with increasing milling time. It was found that BET surface area continuously increases from 1.99 m2/g for an un-milled sample to 17.79 m2/g for 18 hrs milled sample. The BET isotherms exhibited type-II hysteresis loop and suggested that all the samples are macroporous with pore width greater than 50 nm.

Cyclic deformation response and strain-induced martensitic transformation of β single phase Ti-35421 alloy

Compared with bimodal microstructure, the low-cycle fatigue (LCF) behavior and cyclic deformation mechanism of a near β Ti-3Al-5Mo-4Cr-2Zr-1Fe (Ti-35421) alloy with single β were systematically investigated. Lower strength, but higher ductility and longer LCF life were found for Single β. The nanoscale α'' martensite was detected in Single β by selected area electron diffraction pattern. Besides, slips and strain induced martensitic transformation played the major deformation mechanisms in Single β. Moreover, the existence of α'' contributed to the limit of microcracks nucleation in Single β, which resulted in a better fatigue life.

Synthesis of ZrB2@SiC composite particle through sol-gel and carbothermal reduction

Ultrahigh-temperature ceramics have been investigated for their high melting points and outstanding mechanical properties. Among these ceramic materials, ZrB 2 exhibits good thermal properties and chemical resistance owing to its strong combination of ionic and covalent bonds, making it a promising candidate in various industrial fields. However, when ZrB 2 is oxidized, two phases of oxide are produced on the surface of ZrB 2 : ZrO 2 and B 2 O 3 , which degrade the thermal and mechanical properties of ZrB 2 . In this study, a novel method is developed for the fabrication of core-shell-structured ZrB 2 @SiC composite particles to enhance the anti-oxidation properties of ZrB 2 with a fully covered SiC layer through the sol-gel process and carbothermal reduction. Using the sol-gel process with tetraethyl orthosilicate, core-shell ZrB 2 @SiO 2 particles are fabricated, and an amorphous phased shell is seen in the X-ray diffraction pattern. Thereafter, ZrB 2 @SiO 2 is transformed into ZrB 2 @SiC by adding 7 wt% carbon. It has a distinct SiC crystal structure, and its shell thickness is measured as 5.2 nm. High-resolution transmission electron microscopy images and selected area electron diffraction patterns confirm that core-shell-structured ZrB 2 @SiC composite particles are successfully fabricated. • ZrB 2 @SiC nanoparticle had been fabricated through sol-gel and carbothermal reduction. • Pretreatment with acid solution removed oxygen impurity and made -OH bond for SiO 2 . • Carbothermal reduction was carried out to make SiC without the reaction with ZrB 2 • ZrB 2 @SiC nanoparticle can be applied for the refractory and thermal protection.

Structural, Morphological, Optical and Magnetic Studies of Cu-Doped ZnO Nanostructures.

In the present work, Cu-doped ZnO nanostructures (Cu% = 0, 1, 5) have been prepared using microwave-assisted chemical route synthesis. The synthesized nanostructures were investigated through structural, morphological, optical, and magnetic characterizations. The results of the X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and selective area electron diffraction (SAED) patterns confirmed that all of the samples exhibit the single-phase polycrystalline hexagonal crystal structure. The XRD results infer a decrease in the lattice parameters (a/c) by increasing the Cu% doping into ZnO. The field emission scanning electron microscopy (FE-SEM) and energy dispersive x-ray (EDX) spectroscopic measurements revealed the formation of nanostructures, showing the major elemental presence of Zn and O in the samples. The photoluminescence (PL) spectra exhibited photoemission in the UV and blue-green regions. With the increase in the Cu%, the photoemission in the UV region is reduced, while it is enhanced in the blue-green region. Raman spectra of the Cu-doped ZnO nanostructures displayed a blue shift of the E2High mode and an increase in the peak intensity of E1(LO), indicating the doping of Cu ion in the ZnO lattice. The dc magnetization measurements demonstrated the ferromagnetic behavior of all of the samples with an enhanced ferromagnetic character with increasing Cu%.

Structural, Magnetic, and Electrical Properties of CoFe2O4 Nanostructures Synthesized Using Microwave-Assisted Hydrothermal Method.

Magnetic nanostructures of CoFe2O4 were synthesized via a microwave-assisted hydrothermal route. The prepared nanostructures were investigated using X-ray diffraction (XRD), field emission electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, high-resolution transmission electron microscopy (HR-TEM), selective area electron diffraction (SAED) pattern, DC magnetization, and dielectric spectroscopy measurements. The crystal structure studied using HR-TEM, SAED, and XRD patterns revealed that the synthesized nanostructures had a single-phase nature and ruled out the possibility of any secondary phase. The lattice parameters and unit cell volume determined from the XRD data were found to be 8.4821 Å and 583.88 Å3. The average crystallite size (~7.0 nm) was determined using Scherrer's equation. The FE-SEM and TEM micrographs revealed that the prepared nanostructures had a spherical shape morphology. The EDX results showed that the major elements present in the samples were Co, Fe, and O. The magnetization (M) versus temperature (T) measurements specified that the CoFe2O4 nanostructures showed ferromagnetic ordering at room temperature. The blocking temperature (TB) determined using the M-T curve was found to be 315 K. The magnetic hysteresis (M-H) loop of the CoFe2O4 nanostructures recorded at different temperatures showed the ferromagnetic behavior of the CoFe2O4 nanostructures at temperatures of 200 K and 300 K, and a superparamagnetic behavior at 350 K. The dielectric spectroscopy studies revealed a dielectric constant (ε') and loss tangent (tanδ) decrease with the increase in the frequency, as well as demonstrating a normal dispersion behavior, which is due to the Maxwell-Wagner type of interfacial polarization. The values of ε' and tanδ were observed to increase with the increase in the temperature.