scholarly journals FTIR, Optical, Electrical and Magnetic Properties of Sm3+ Doped Mg Nano Ferrites

2021 ◽  
Vol 11 (6) ◽  
pp. 15037-15050
Keyword(s):  
Single Phase ◽  
Spectroscopic Analysis ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Vibrating Sample Magnetometer ◽  
Thermo Electric ◽  
Electrical And Magnetic Properties ◽  
Auto Combustion ◽  
Electrical Resistivities ◽  
Uv Visible

Synthesized Sm, doped Mg nano ferrites with composition MgSmxFe2-xO4 (x = 0,0.025, 0.050, 0.075, 0.100) using the technique of citrate-gel auto-combustion method were analyzed through various experimental techniques. XRD analysis confirmed single-phase cubic spinel structure, while FTIR spectroscopic analysis displayed two absorption peaks that are characteristic of spinel nano ferrites. UV-visible spectral analysis was carried out to study the optical absorption behavior of the prepared ferrites. Two probe method was used to study the dc electrical resistivities of Sm doped Mg nanoferrites between 200 °C–500 °C. A plot between log (σT) vs. inverse temperature yields a curve that reveals prepared nano ferrites' semiconducting nature. A study of TEP (Thermo Electric Power) for prepared samples was carried out at a high temperature (573K). Seebeck coefficient and Curie Temperature of Sm doped Mg nanoferrites were observed. Measurements of magnetization were done by using VSM (Vibrating Sample Magnetometer).

scholarly journals FTIR, Optical, Electrical and Magnetic properties of Sm+3 doped Mg Nano Ferrites by Citrate-Gel Auto combustion method

2021 ◽  
Author(s):  
Venkatesh Nakiraboina ◽  
Shyam sunder Goud ◽  
Hari Kumar Nama ◽  
D Ravinder ◽  
Veera Somaiah P
Keyword(s):  
Single Phase ◽  
Spectroscopic Analysis ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Thermo Electric ◽  
X Ray ◽  
Electrical And Magnetic Properties ◽  
Auto Combustion ◽  
Electrical Resistivities ◽  
Uv Visible

Abstract Sm, doped Mg nano ferrites with composition Mg Sm x Fe2 − x O4 (where X = 0.000, 0.025, 0.050, 0.075,0.1) were synthesized by citrate-gel auto-combustion method. The Samples were analyzed through various experimental techniques. The structural confirmation was done with the basic characterization techniques such as XRD (X-ray Powder Diffraction) and Fourier Transform Infrared (FTIR) spectroscopic analysis. To study the optical absorption behavior of the prepared ferrites, UV-visible spectral analysis was carried out. XRD analysis established the formation of single-phase cubic spinel structure of the materials. FTIR spectra has shown two absorption peaks that are characteristic of spinel nano ferrites. The dc electrical resistivities of the Sm doped Mg nano ferrites were studied by using two probe method at the temperature range of 200–500 °C. A plot of log (σT) vs inverse of temperature yields a curve which reveals a semiconducting nature of prepared nano ferrites. The Thermo Electric Power (TEP) studies of prepared samples carried out at high temperature (573K). The values of the Seebeck coefficient and curie temperature of Sm doped Mg nano ferrites were observed. The magnetization measurements were carried out by using Vibrating Sample Magnetometer (VSM).

Structural, magnetic and high frequency (1–6 GHz) parameters of Sr-substituted BaFe2O4 monoferrites synthesized by sol–gel method

2019 ◽  
Vol 33 (19) ◽  
pp. 1950219 ◽  
Author(s):  
Mukhtar Ahmad ◽  
Jawaria Shaheen ◽  
Waseem Abbas Hashmi ◽  
Majid Niaz Akhtar ◽  
Muhammad Asif
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Anisotropy Constant ◽  
Dielectric Parameters ◽  
Single Phase Sample ◽  
Heat Treated Sample ◽  
Auto Combustion ◽  
Phase Spinel

In this work, Sr-substituted samples of single-phase spinel monoferrites with chemical formula [Formula: see text] (x = 0.00, 0.33, 0.67, 1.00) were synthesized using sol–gel auto-combustion method. In order to confirm the single-phase formation of these samples, a sample (x = 0.00) was chosen for heat treatment at different temperatures (100, 300, 400, 600 and [Formula: see text]) for 4 h. The heat treated sample was then investigated by X-ray diffraction (XRD) analysis and results showed that a single-phase sample can be successfully synthesized at a temperature of [Formula: see text], which is much lower than that reported in earlier literature for synthesis of same structured samples. All the synthesized samples were then sintered at [Formula: see text] for 4 h to achieve better crystallinity. From XRD patterns, lattice parameters, cell volume and XRD density as a function of Sr-substitution were calculated. Scanning electron microscopy (SEM) results showed that the grain size increased as the temperature was increased. Fourier transform infrared spectroscopy (FTIR) results confirmed the single-phase spinel monoferrites at [Formula: see text]. From M–H loops (x = 0.0, 0.33, 0.67 and 1.00), different magnetic parameters such as saturation magnetization [Formula: see text], remanance [Formula: see text], coercivity [Formula: see text] and magnetic moment [Formula: see text] were calculated. Magnetocrystalline anisotropy constant and Y–K angles of Sr-doped Ba monoferrites were also calculated. In addition, the variation of different dielectric parameters (real permittivity, imaginary permittivity, real permeability, imaginary permeability, ac conductivity and loss tangent) as a function of frequency (1–6 GHz) has been discussed in this work. The results suggest that the synthesized materials have many advantages over previously reported single-phase spinel monoferrites.

PHOTOCATALYTIC PROPERTIES OF NANOCRYSTALLINE ZnFe2O4 SYNTHESIZED AT LOW TEMPERATURE BY SOLVO-COMBUSTION METHOD

2011 ◽  
Vol 10 (06) ◽  
pp. 1231-1235 ◽  
Author(s):  
S. B. KONDAWAR ◽  
S. R. THAKARE ◽  
N. S. BHAVE ◽  
D. K. BURGHATE
Keyword(s):  
Low Temperature ◽  
Visible Light ◽  
Spinel Structure ◽  
Single Phase ◽  
Combustion Method ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible ◽  
Reference Catalyst

Facile, low temperature solvo-combustion synthesis route is used to prepare nanocrystalline ZnFe2O4 having spinel structure. Synthesized ZnFe2O4 has been analyzed using X-ray diffraction (XRD), TEM and UV-Visible spectrometry. XRD analysis indicates the single-phase of the material ZnFe2O4 , whose crystallite size was found to be 10 nm evaluated using Scherrer's equation and confirmed from TEM image. The visible-light-activated photocatalytic activity of the nanocrystalline ZnFe2O4 has been compared to P-25 degussa TiO2 reference catalyst, using a visible light for the degradation of phenol.

scholarly journals Effect of Re and Tm-site on morphology structure and optical band gap of ReTmO3 (Re: La, Ce, Nd, Gd, Dy, Y and Tm: Fe, Cr) prepared by sol-gel method

2018 ◽  
Vol 64 (4) ◽  
pp. 381
Author(s):  
Muhammad Tufiq Jamil ◽  
Javed Ahmad ◽  
Syed Hamad Bukhari ◽  
Murtaza Saleem
Keyword(s):  
Band Gap ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
X Ray ◽  
Average Grain Size ◽  
Auto Combustion ◽  
Uv Visible

Rare earth nano sized pollycrystalline orthoferrites and orthocromites ReT mO3 (Re = La, Nd, Gd, Dy, Y and T m = Fe, Cr) have been synthesized by sol-gel auto combustion citrate method. The samples have been characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and UV-visible spectroscopy. The samples are single phase as confirmed by XRD analysis and correspond to the orthorhombic crystal symmetry with space group pbnm. Debye Scherer formula and Williamson Hall analysis have been used to calculate the average grain size which is consistent with that of determined from SEM analysis and varied between 25-75 nm. The elemental compositions of all samples have been checked by EDX analysis. Different crystallographic parameters are calculated with strong structural correlation among Re and Tm sites. The optical energy band gap has been calculated by using Tauc relation estimated to be in the range of 1.77 - 1.87 eV and 2.77 - 3.14 eV, for ReFeO3 and ReCrO3, respectively.

LiMn1.5Ni0.25Fe0.2M0.05O4 Nanoparticles as a Cathode Material for Rechargeable Li-Ion Batteries

2020 ◽  
Vol 835 ◽  
pp. 149-154
Author(s):  
Haitham A. Abdellatif ◽  
Mostafa M.M. Sanad ◽  
Elsayed M. Elnaggar ◽  
Mohamed M. Rashad ◽  
Gamal M. El-Kady
Keyword(s):  
Annealing Temperature ◽  
Sol Gel ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Charge Transfer Resistance ◽  
Li Ion Batteries ◽  
Transfer Resistance ◽  
Auto Combustion ◽  
Li Ion ◽  
Kinetic Diffusion

New series of spinel LiNi0.25Fe0.2Mˊ0.05Mn1.5O4 (Mˊ = Cu, Mg or Zn) cathode materials have been purposefully tailored using sol-gel auto-combustion method at low annealing temperature ~ 700°C for 3 h. The XRD analysis showed that all substituted (LNFMO-Mˊ) samples are comported with the main structure of undoped (LNFMO) with crystalline disordered spinel Fd-3m structure. TEM images revealed the octahedron-shape like morphology for the particles and the LNFMO-Zn sample has the widest particle size distribution. EIS spectra evidenced that a typical one semicircle (LNFMO-Mg) was revealed for each cell, suggesting the absence of ionic conductivity contribution. The values of charge transfer resistance (Rct) were equal to 9.3, 6.7, 6.0 and 4.4 kΩ for LNFMO, LNFMO-Cu, LNFMO-Mg indicating that the Zn-doped sample has the fastest kinetic diffusion rate and lowest activation energy of conduction.

SYNTHESIS OF THE NANOCRYSTALLINE NICKEL FERRITE BY A NOVEL MECHANO SOL–GEL AUTO-COMBUSTION METHOD

2011 ◽  
Vol 25 (11) ◽  
pp. 855-861 ◽  
Author(s):  
M. SHAHMIRZAEI ◽  
S. A. SEYYED EBRAHIMI ◽  
R. DEHGHAN
Keyword(s):  
Nickel Ferrite ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
High Energy ◽  
Milling Process ◽  
Nanocrystalline Powder ◽  
High Energy Milling ◽  
Metal Nitrates ◽  
Auto Combustion

In this work, a novel method of mechano sol–gel auto-combustion has been developed for production of single phase nickel ferrite nanocrystalline powder, consisting of a sol–gel auto-combustion synthesis followed by a high energy milling process before calcination. Sol–gel auto-combustion was carried out using a gel including citric acid as a reductant and metal nitrates as oxidants. This gel exhibited a self-propagating behavior after ignition in air. The effects of the intermediate high energy milling on the physical properties of the final product after calcination were investigated. The results showed that with a high energy milling of the sol–gel auto-combusted powders with a ball-to-powder mass ratio of 20 for 20 h, the temperature of calcination for synthesis of the single phase ferrite reduced from 1000°C to 700°C and the size of the ferrite crystallites decreased from 72 nm to 15 nm.

scholarly journals Optical And Electrical Properties of PVA/A-Al2O3 Nanocomposite Films

2019 ◽  
Vol 16 (1) ◽  
pp. 280-298
Author(s):  
Sara El-Molla ◽  
R. Mahmoud ◽  
A.F. Mansour ◽  
S.F. Mansour ◽  
M.A. Abdo
Keyword(s):  
Electron Microscopy ◽  
Interfacial Polarization ◽  
Combustion Method ◽  
Nanocomposite Films ◽  
Al2o3 Content ◽  
Al2o3 Nanoparticles ◽  
Ac Electrical Conductivity ◽  
Casting Technique ◽  
Auto Combustion ◽  
Uv Visible

In the present study, a-Al2O3 nanoparticles were synthesized using the citrate-nitrate auto combustion method. Nanocomposites of PVA/a-Al2O3 were intended by solution casting technique. The micrograph of samples were analysed by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM) and UV-visible spectroscopy analysis. UV-visible results showed that the direct optical band gap decreased with the increase of a-Al2O3 content. The refractive index has been dissected using Wemple and DiDomenico model. Hopping of charge carriers besides interfacial polarization could expound the demeanor of dielectric constant (E'), dielectric loss (E'') and ac electrical conductivity (0-ac) with the frequency and temperatures.

Study of the magnetic and structural properties of Al–Cr codoped Y-type hexaferrite prepared via sol–gel auto-combustion method

2015 ◽  
Vol 29 (14) ◽  
pp. 1550090 ◽  
Author(s):  
O. Mirzaee ◽  
R. Mohamady ◽  
A. Ghasemi ◽  
Y. Alizad Farzin
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Combustion Method ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hexagonal Shape ◽  
Auto Combustion ◽  
Xrd Patterns ◽  
Cr Doping

Nanostructure of Y-type hexaferrite with composition of Sr 2 Ni 2 Al x/2 Cr x/2 Fe 12-x O 22 (where x are 0, 0.6, 1.2, 1.8, 2.4 and 3) were prepared by sol–gel auto-combustion method. The influence of Al and Cr doping on the structural and magnetic properties has been investigated. The X-ray diffraction (XRD) patterns confirm phase formation of Y-type hexaferrite. The microstructure and morphology of prepared samples were studied by high resolution field emission scanning electron microscope (FESEM) which shows the hexagonal shape for all of the samples. Magnetic properties were characterized using vibrating sample magnetometer (VSM). The magnetic results revealed that by increasing the Al and Cr to the structure, the coercivity was also increased from 840 Oe to 1160 Oe. Moreover it has been shown that with addition of dopants, saturation magnetization (Ms) and remnant magnetization (Mr) were decreased from 39.61 emu/g to 30.11 emu/g and from 17.51 emu/g to 14.62 emu/g, respectively, due to the entrance of nonmagnetic ions into Fe 3+ sites.

SINGLE STEP SYNTHESIS OF MAGNESIUM FERRITE NANOCRYSTALLITES AND SOME OF ITS CHARACTERISTICS

2009 ◽  
Vol 08 (01n02) ◽  
pp. 87-91 ◽  
Author(s):  
AYE AYE THANT ◽  
SRIMALA SREEKANTAN ◽  
PHO KAUNG ◽  
MITSURU ITOH ◽  
RADZALI OTHMAN ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ignition Temperature ◽  
Spinel Structure ◽  
Single Phase ◽  
Condensation Reaction ◽  
Combustion Process ◽  
Xrd Analysis ◽  
Single Step ◽  
Magnesium Ferrite ◽  
Auto Combustion

The present study elucidates the synthesis of magnesium ferrite magnetic nanocrystallites via hydroxylation–condensation reaction followed by an auto-combustion process. Nanocrystallites with diameter of 3–7 nm were successfully formed via this method. The ignition temperature of the redox reaction was apparently improved to 200°C by the modification of the pH of the metal aqueous solution. The crystallite size was altered by varying the hydrolysis parameters. The XRD analysis of the as-synthesized powder confirms the formation of a single-phase MgFe 2 O 4 spinel structure. Importantly, the crystalline particles were obtained at low temperature without further calcination. The thermodynamic behavior of the precursor was characterized by DTA-TG. TEM observations showed the morphology and crystal structure of the nanocrystallites.

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