Synthesis & Characterization of Europium, Yttrium and Iron-based Nanoparticles (original) (raw)
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Gadolinium ferrite nanoparticles: Synthesis and morphological, structural and magnetic properties
A B S T R A C T In this study we report on the successful synthesis of Gd x Fe 3−x O 4 nanoparticles with nominal Gd-content (x) in the range 0.00≤x≤0.50. The effect of the nominal Gd-content on morphological, structural and magnetic properties was investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy and Mössbauer spectroscopy. We found the actual inclusion of Gd 3+ ions into cubic ferrite structure lower than the nominal values, though no extra phase was observed in the whole range of our investigation. Moreover, from Mössbauer data we found evidences of Gd 3+ ions replacing both Fe 3+ and Fe 2+ ions, the latter leading to iron vacancies in the cubic ferrite crystal structure. As the nominal Gd-content, the lattice parameter and the average crystallite size increases monotonically. We found that in the same range of nominal Gd-content the lattice parameter decreases with the increase of iron vacancy content.
2012
Spinel ferrite nanocrystals are regarded as one of the most important inorganic nanomaterials because of their electronic, optical, electrical, magnetic, and catalytic properties. These properties are dependent on the chemical composition and microstructural characteristics in which the particle size and shape might be controlled in the fabrication processes. The preparation of spinel ferrite nanocrystals through different routes has become an essential in research and development. But, the most commonly applied synthesis methods are difficult to employ on a large scale because of their complicated procedures, high reaction temperatures, long reaction times, toxic reagents and by-products, and their potential harm to the environment. In this thesis a simple thermal treatment method is described for synthesis of spinel ferrite MFe 2 O 4 (M = Ni, Co, Mn, Zn, or their binary metal) nanoparticles. In this method, an aqueous solution of poly (vinyl pyrrolidone) (PVP) LIST OF PUBLICATIONS 192
Synthesis and Characterisation of Nanostructured Ferric Oxide
Since iron oxides have diverse physical and structural properties, it contributes to natural processing and its uses are uncountable. The structural and size dependent activities are the main characteristics which are to be defined for assessing its role. The different phases of iron oxide such as hematite, maghemite and magnetite are summarized. The article includes the synthesis and characterization of nano-ferric oxide which are at the core of nanotechnology due to their specific properties and applications. The characterization is carried out by x-ray diffraction, FE-SEM and UV/Visible spectroscopy. The aim of the characterization techniques is to define the structural, optical and morphological parameters. The structural analysis of the nanoparticle is identified by powder X-ray diffraction and the optical and topographical parameters are stated by FE-SEM and UV/Visible spectroscopy correspondingly. The preparation of ferric oxides from ferricyanide and ferro cyanide is represented where the results are comparatively discussed with the help of flowchart.
Materials, 2020
Interest in magnetic nanoparticles is primarily due to their practical use. In this work, for the production of nanocrystalline powders of pure and gadolinium doped iron oxides, the extraction-pyrolytic method (EPM) was used. As a precursor, either iron-containing extract (iron (III) caproate in caproic acid) or its mixture with gadolinium-containing extract (gadolinium (III) valerate in valeric acid) was used. The mixed precursor contained 0.5 mol %, 2.5 mol %, 12.5 mol %, 50 mol %, and 75 mol % gadolinium in relation to the iron content. The formation of iron oxide phases, depending on the preparation conditions, was investigated. According to the results obtained, it was demonstrated that the presence of more than 2.5 mol % gadolinium additive in the mixed precursor inhibits the magnetite-to-hematite transformation process during thermal treatment. Produced samples were characterized by XRD and SEM methods, and the magnetic properties were studied.
Synthesis and characterization of mixed ferrite nanoparticles
Journal of Optoelectronics and Advanced …, 2006
Three mixed ferrite systems, namely Ni 0.65 Zn 0.375 In x Ti 0.025 Fe 1.95-x O 4 (Ni-Zn-In-Ti), Ni 0.65 Zn 0.35 Fe 2 O 4 (Ni-Zn) and Mn 0.75 Zn 0.18 Fe 2.07 O 4 (Mn-Zn) have been chosen for the present study to compare their structural and magnetic characterizations under different ferrite nano preparation routes. Ni-Zn-In-Ti ferrite nanoparticles have been prepared using first by a classical ceramic method to result in sintered ferrite specs and then by mechanosynthesis approach of ball milling to have ultra fine ferrite particles. Ni-Zn and Mn-Zn ferrite nanoparticles were prepared by a soft chemical approach of coprecipitation and then heat treated the particles at different annealing temperatures for improved crystallinity. The samples were then subjected to x-ray diffraction technique, vibrating sample magnetometry and ferromagnetic resonance (FMR) spectrometry and the results are compared and discussed in the light of the existing understanding.
Synthesis then Characterization Regarding Nanostructured Ferric Oxide 1
Since iron oxides have diverse physical and structural properties, it contributes to natural processing and its uses are uncountable. The structural and size dependent activities are the main characteristics which are to be defined for assessing its role. The different phases of iron oxide such as hematite, maghemite and magnetite are summarised. The article includes the synthesis and characterisation of nanoferric oxide which are at the core of nanotechnology due to their specific properties and applications. The characterization is carried out by X-ray diffraction, FE-SEM and UV/Visible spectroscopy. The aim of the characterisation techniques is to define the structural, optical and morphological parameters. The structural analysis of the nanoparticle is identified by powder X-ray diffraction and the optical and topographical parameters are stated by FE-SEM and UV/Visible spectroscopy correspondingly. The preparation of ferric oxides from ferricyanide and ferro cyanide is represented where the results are comparatively discussed with the help of flowchart.
Journal of Advanced Physics, 2014
Fe 3 O 4 nanoparticles have been synthesized by chemical co-precipitation method. Powder X-ray diffraction technique has been used for structural characterization. The X-ray diffraction pattern confirms the single crystalline phase of the developed particles. Structural parameters viz. crystallite size, lattice constant, X-ray density, porosity, specific surface area, lattice strain are calculated using the X-ray diffraction data. Crystalline size as calculated by Scherrer formula for diffraction peak corresponding to the (311) plane and was found to be 22 nm. Transmission Electron Microscopy (TEM) micrograph confirms the nano-size confirmation of prepared sample. Dielectric parameters i.e., real part of dielectric constant ( ), dielectric loss (tan ) and ac conductivity ( ac ) of synthesized nano-particle have been studied in frequency range of 100 Hz-5 MHz and in temperature range of 300 K to 473 K. The sharp decrease in the values of dielectric constant ( ) at lower frequencies has been observed which is in accordance with Maxwell-Wagner two layer model. ac increases with increase in frequency and temperature which is in accordance with Jonscher's power law. At low frequencies ac is almost constant which corresponds towards the dc component of total conductivity. DC resistivity measurements are done on sample pallet in the temperature range 343 K to 573 K, a conductivity of the order of 4.29 × 10 −7 mho/m was observes at 343 K and also a decrease in electrical resistivity of Fe 3 O 4 nanoparticles with increase in temperature has been observed which ensure the semiconducting nature of prepared ferrite sample.
Advances in Nanoparticles, 2015
In this work, the Mg1-xZnxFe2O4 Nanoferrites (where x = 0.0, 0.2, 0.4, 0.6 and 0.8) was synthesized using co-precipitation method. The investigation of structural and optical properties was carried out for the synthesized samples using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Ultraviolet visible spectrophotometer (UV-Vis). XRD revealed that the structure of these nanoparticles is spinel with space group Fd3m and crystallite size lies in the range 21.0 -42.8 nm. Lattice parameter was found to increases with Zn concentration and this may be due to the larger ionic radius of the Zn 2+ ion. FTIR spectroscopy confirmed the formation of spinel ferrite and showed the characteristics absorption bands around 612, 1146, 1404, 1649 and 3245 cm −1 . The energy band gap was calculated for samples with different ratio and was found to be 4.77, 4.82, 4.86, 4.87 and 4.95 eV. The substitution was resulted in slight increased in the lattice constant and that sequentially may lead to the slightly decreased in the energy gap.
Synthesis then Characterization Regarding Nanostructured Ferric Oxide
2017
Since iron oxides have diverse physical and structural properties, it contributes to natural processing and its uses are uncountable. The structural and size dependent activities are the main characteristics which are to be defined for assessing its role. The different phases of iron oxide such as hematite, maghemite and magnetite are summarised. The article includes the synthesis and characterisation of nanoferric oxide which are at the core of nanotechnology due to their specific properties and applications. The characterization is carried out by X-ray diffraction, FE-SEM and UV/Visible spectroscopy. The aim of the characterisation techniques is to define the structural, optical and morphological parameters. The structural analysis of the nanoparticle is identified by powder Xray diffraction and the optical and topographical parameters are stated by FE-SEM and UV/Visible spectroscopy correspondingly. The preparation of ferric oxides from ferricyanide and ferro cyanide is represent...