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).

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).

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.

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.

Study of Sol-Gel Auto-Combustion Method Prepare Ni0.6-xZn0.4MgxFe2O4

2012 ◽  
Vol 463-464 ◽  
pp. 1052-1056
Author(s):  
Ai Xiang Zeng ◽  
Jun Yuan
Keyword(s):  
Crystal Structure ◽  
Zinc Ferrite ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nickel Zinc ◽  
Auto Combustion ◽  
Scanning Electron

Ni0.6-xZn0.4MgxFe2O4were synthesized by sol-gel auto-combustion method with Zn(NO3.) 2 •6H2O. , Ni(NO3.) )2•6H2O. , Mg(NO3.) )2•6H2O. , Fe(NO3.) )3•9H2O. , COOO2. and NH3•H2O. X-ray diffraction (XRD) analysises show that the sample is single phase and the doping of magnesium makes no difference to nickel-zinc ferrite’s crystal structure; nickel-zinc ferrite has formed after auto-combustion. Scanning electron microscope analysises show that after sintered the sample’s size is more even and the doping of magnesium makes the size smaller and more even too.

scholarly journals Effect of the Glycine Treatment on Synthesis and Physicochemical Characteristics of Nanosized Ni-Mn Mixed Oxides

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 487
Author(s):  
Ghadah M. Al-Senani ◽  
Omar H. Abd-Elkader ◽  
Nada S. Al-Kadhi ◽  
Nasrallah M. Deraz
Keyword(s):  
Single Phase ◽  
Mixed Oxides ◽  
Magnetic Measurement ◽  
Room Temperature Ferromagnetism ◽  
Combustion Method ◽  
Physicochemical Characteristics ◽  
Ceramic Method ◽  
X Ray ◽  
Auto Combustion ◽  
Derivative Thermogravimetry

Magnetic Ni-Mn mixed oxides based on nanoparticles (NPs) have been developed at 700 °C using a ceramic method and a glycine-assisted auto combustion path. The thermogravimetry–derivative thermogravimetry (TG—DTG), infrared radiation (IR), X-ray powder diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and high resolution transmittance electron micrographs (HRTEM) techniques have been used to characterize as synthesized nanomaterials by evaluating their thermal behavior, structure, distinguishing the components and establishing the morphology. A vibrating sample magnetometer has been used to estimate the magnetic properties of the materials (VSM). The analyses indicate that using a glycine-assisted auto combustion method resulted in formation of cubic spinel NiMn2O4 NPs as a single phase. The ceramic process, from the other side, led to the development of Mn2O3/NiMnO3/NiMn2O4 nanocomposite. The resulting particles being polycrystalline, including average sizes ranging from 10 to 80 nanometers. The prepared NiMn2O4 NPs showed room-temperature ferromagnetism, with an optimal saturation magnetization value of 5.0216 emu/g, according to the magnetic measurement.

scholarly journals Synthesis and Characterization of Ce3+-Doped Ni0.5Cd0.5Fe2O4 Nanoparticles by Sol–Gel Auto-Combustion Method

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1156
Author(s):  
Danyal Ahmad ◽  
Nasir Mehboob ◽  
Abid Zaman ◽  
Nabeel Ahmed ◽  
Kashif Ahmed ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystallite Size ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Sem Images ◽  
X Ray ◽  
Auto Combustion ◽  
Ray Density

Cerium (Ce)-doped Ni0.5Cd0.5CexFe2−xO4 (0.0 ≤ x ≤ 0.20) was synthesized using the sol–gel auto-combustion method. X-ray diffraction (XRD) analysis revealed that all the samples retained spinel cubic crystal structure with space group Fd3m at 800 °C. Crystal structure parameters, such as lattice constant, average crystallite size, and X-ray density were estimated from the major XRD (311) peak. Bulk density and porosity were also calculated. The average crystallite size was estimated to be in the range of 20–24 nm. SEM images displayed agglomerated particles with a porous morphology. The dielectric constant (ε′) increased and the dielectric loss tangent (tanδ) decreased with rising Ce concentration. The hysteresis loop (M–H loop) was measured at room temperature using a vibrating-sample magnetometer (VSM), which showed a nonlinear decrease in magnetization and coercivity with increasing Ce concentration.

scholarly journals Studies on the photoluminescence and thermoluminescence properties of CaZrO3:xEu3+ phosphor for dosimetric application

2021 ◽  
Author(s):  
Marjaneh Jafari Fesharaki ◽  
Mohammad Reza Jalali ◽  
Leila Karimi ◽  
Ehsan Sadeghi
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
Electric Dipole Transition ◽  
Dipole Transition ◽  
Prepared Phosphor ◽  
X Ray ◽  
Auto Combustion ◽  
Red Luminescence ◽  
Xrd Patterns

Abstract Series of CaZrO3:xEu3+ (x=0.01, 0.02, 0.03, 0.04 and 0.05) phosphors have been prepared by low temperature sol-gel auto combustion method. The structure and morphology of the samples were investigated by X-ray diffraction (XRD) and field-emission scanning electron microscope (FE-SEM). The energy-dispersive X-ray spectroscope (EDX) was employed to analyze the elemental composition of the phosphor. The XRD patterns indicated that the sample was single phase at 350 ◦C with a perovskite structure. The optimum temperature for the single- phase and crystalline phosphors of CaZrO3:xEu3+ was 700 ◦C. Study of photoluminescence (PL) at room temperature showed that the phosphors can be excited by light with a wavelength of 391 nm. The results of emission spectrum showed that the red luminescence of CaZrO3:xEu3+ due to electric dipole transition of 5D0→7F2 was dominant at wavelength of 615 nm and weaker transition at wavelength of 590 nm which was due to magnetic dipole transition of 5D0→7F1. For the thermoluminescence (TL) study the prepared sample irradiated by X-ray lamp, the TL curve was then recorded at fixed heating rate of 2 ◦C/s. The TL glow curve showed well single peak at a temperature of 165 ◦C. The effect of Eu3+ concentration at fixed X-ray exposure time was studied and maximum TL occurred at x=0.02. Also the variation of TL intensity with X-ray time (5 to 15 min) showed linear response with dose. The TL glow peak shows more stability and less fading in prepared phosphor which is suitable for TL dosimetry.

Structural, Optical and Photocatalytic Photodegradation Properties of Zn1−xMnxO Prepared by the Sol-Gel Process

2011 ◽  
Vol 239-242 ◽  
pp. 2962-2967 ◽  
Author(s):  
Chuan Ling Men ◽  
Hong Qin Li ◽  
Hua Zhang
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Xrd Analysis ◽  
Mn Doping ◽  
X Ray ◽  
Decolorization Efficiency ◽  
Vis Spectroscopy ◽  
Sol Gel Process ◽  
Uv Visible ◽  
Mn Doped

Effect of Mn doping on the structural, photoluminescence and photocatalytic photodegradation properties of Zn1−xMnxO have been studied. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. The samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), photoluminescence and UV-visible (UV-Vis) spectroscopy. XRD analysis showed that Zn1−xMnxO can keep a single phase of wurtzite structure at low Mn doping. UV-Vis spectra of Mn-doped samples showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels.

scholarly journals Low temperature magnetic properties of erbium doped Bismuth nano-ferrites

2021 ◽  
Author(s):  
Naveena Gadwala ◽  
D Ravinder ◽  
Sumalatha Edapalli ◽  
Vani K ◽  
Rajender Thota
Keyword(s):  
Magnetic Properties ◽  
Bismuth Ferrite ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Nano Particles ◽  
Blocking Temperature ◽  
Rhombohedral Structure ◽  
Zero Field ◽  
X Ray ◽  
Auto Combustion

Abstract Nano-crystalline Pure and Erbium(Er) substituted Bismuth ferrite nano-particles were synthesized by the citrate-gel auto combustion method. Synthesized powders were sintered at 5000C for five hours in an air and characterized by XRD, TEM and HR-TEM. X-ray diffraction (XRD) analysis showed distorted rhombohedral structure of the ferrites. The surface morphology and particle size of the samples was observed by high resolution transmission electron microscopy. The lattice parameter, crystalline size, X-ray density has been calculated from d-spacing. The perceived results can be explained depending on doping concentration. Temperature dependence of magnetic properties of Bi-Er nano-particles were carried out by using vibrating sample magnetometer (VSM). The magnetization as a function of applied field at ± 100 Oe was carried out at 3K and 300K. Zero field cooled and (ZFC) and Field cooled (FC) magnetization measurements under an applied of 100 Oe in the temperature range of 3-360K. These measurements give the results of blocking temperature (Tb) at around 350K.

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