The influence of oxygen vacancies on the dielectric relaxation behavior pure and Eu-substituted BiFeO3 nanoparticles synthesized by a sol-gel technique has been studied using impedance spectroscopy in temperature range 90 °C to 180 °C. electric time activation energy can be calculated from Arrhenius equation, found 1.26 eV 1.76 for BiFeO3, respectively. Substitution induces structural disorder changes Fe-O-Fe bond angle, leading alteration magnetic properties, observed studies evaluated...

Polyethylene glycol (PEG) coated magnetic Fe3O4 nanoparticles with diameters of 12 nm, 15 and 16 nm were synthesized by the usual co-precipitation method. The structure morphology samples characterized using X-ray diffraction (XRD) high resolution transmission electron microscopy (HRTEM). ac susceptibility measurements carried out a vibrating sample magnetometer (VSM). dc commercial Quantum Design superconducting quantum interference device (SQUID). XRD patterns indicated sole existence...

We have investigated the structure, magnetic and dielectric properties of PVDF-La0.7Sr0.3MnO3 polymer nanocomposite thick film fabricated by dip coating technique along with magnetodielectric effect. The structure show enhanced β phase in composite compared to PVDF film. coupling between ferroelectric phases is revealed form anomaly at ferromagnetic Curie temperature. observed 1.9% effect 300 K possibility near transition In addition, analysis electric modulus indicates that exhibits...

We report structural and magnetic properties of rare earth doped Bi0.95R0.05 FeO3 (R = Y, Ho, Er) submicron particles. Rare doping enhances the magnetization shows an increasing trend with decreasing dopant ionic radii. In contrast to x-ray diffraction pattern, we have seen a strong evidence for presence iron garnets R3Fe5O12 in measured as function temperature, selected area electron diffraction, Raman measurements. Our results emphasised role secondary phases property BiFeO3 compounds...

We have carried out extensive measurements on novel Fe₃O₄-γ-Fe₂O₃ core-shell nanoparticles of nearly similar core diameter (8 nm) and various shell thicknesses 1 nm (sample S1), 3 S2), 5 S3). The structure morphology the samples were studied using X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area (SAED). direct current (DC) magnetic a superconducting quantum interference device (SQUID). Exchange bias coercivity investigated at several temperatures where applied...

Understanding saturation magnetization and its behavior with particle size temperature are essential for medical applications such magnetic hyperthermia. We report the effect of shell thickness field cooling on in Fe3O4/γ-Fe2O3 core/shell nanoparticles fixed core diameter (8 nm) several thicknesses. X-ray diffraction (XRD) analysis transmission electron microscopy (TEM, high-resolution (HRTEM)) were used to investigate phase morphology samples. Selected area (SAED) confirmed structure...

We report the transition from robust ferromagnetism to a spin-glass state in nanoparticulate $\mathrm{L}{\mathrm{a}}_{0.7}\mathrm{S}{\mathrm{r}}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$ through solid solution with $\mathrm{BaTi}{\mathrm{O}}_{3}$. The field- and temperature-dependent magnetization frequency-dependent ac magnetic susceptibility measurements strongly indicate existence of system, which is further confirmed memory effect measurements. breaking long-range ordering into short-range...

Understanding the size dependent magnetic anisotropy of iron oxide nanoparticles is essential for successful application these in several technological and medical fields. PEG-coated (Fe3O4) with core diameters 12 nm, 15 16 nm were synthesized by usual co-precipitation method. The morphology structure investigated using transmission electron microscopy (TEM), high resolution (HRTEM), selected area diffraction (SAED), X-ray (XRD). Magnetic measurements conducted a SQUID. effective was...

We have synthesized BiFeO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , Bi xmlns:xlink="http://www.w3.org/1999/xlink">0.95</sub> Y xmlns:xlink="http://www.w3.org/1999/xlink">0.05</sub> FeO Ho and Er compounds by the usual solgel route. The structural properties of materials were characterized X-ray diffraction (XRD). optical measured UV-visible spectroscopy. pattern Reitveld refinement confirm predominant BFO rare earth doped phases...

Single phase Bi(1−x)EuxFeO3 multiferroic nanoparticles were synthesized by tartaric acid assisted sol-gel method and the effect of Eu substitution in Bismuth ferrite (BFO) was investigated on structural, optical magnetic properties. It observed a gradual structural transition from rhombohedral R3c to orthorhombic Pbnm with increase content resulted lattice distortion BFO system due smaller radius Eu3+ ions. The band gap altered respect change particle sizes increment content. property found...

AbstractThe phase composition, the structure of cores and shells, dependences shell thickness on fabrication technique were determined by Mössbauer spectroscopy for core/shell Fe_3O_4/γ-Fe_2O_3 magnetic nanoparticles (MNPs) with Fe_3O_4 a fixed size (8 nm) γ-Fe_2O_3 shells varying (1, 3, or 5 nm). A layer MNP surface state differing from that in bulk was found. It also found spin-glass probably exists between core shell. The studied MNPs have promising applications various fields (e.g., biomedicine).