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.

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.

scholarly journals Structural, impedance and Mössbauer studies of magnesium ferrite synthesized via sol–gel auto-combustion process

2017 ◽  
Vol 21 (8) ◽  
pp. 899-910 ◽  
Author(s):  
Shahid Khan Durrani ◽  
Sumaira Naz ◽  
Mazhar Mehmood ◽  
Muhammad Nadeem ◽  
Muhammad Siddique
Keyword(s):  
Sol Gel ◽  
Combustion Process ◽  
Magnesium Ferrite ◽  
Mössbauer Studies ◽  
Auto Combustion

Crystal structure and X-ray powder diffraction pattern of Ti2ZrAl

2000 ◽  
Vol 15 (3) ◽  
pp. 189-190 ◽  
Author(s):  
D. Sornadurai ◽  
B. Panigrahi ◽  
V. S. Sastry ◽  
Ramani
Keyword(s):  
Crystal Structure ◽  
Diffraction Pattern ◽  
Powder Diffraction ◽  
Single Phase ◽  
Xrd Analysis ◽  
Melting Method ◽  
X Ray ◽  
Structure Space ◽  
Arc Melting ◽  
Phase Pure

We report precision X-ray powder-diffraction (XRD) data of single phase pure Ti2ZrAl. Ti2ZrAl samples were prepared by an arc melting method and annealed at 1000 °C for 30 days. XRD analysis was carried out on these samples and it was found that Ti2ZrAl has a DO19 structure (space group P63/mmc, No. 194). The lattice parameters are found to be a=5.961±0.001 Å and c=4.793±0.001 Å.

Temperature and time dependence of phase formation of HgBa2Can−1CunO2(n+1)+δ superconductors

1999 ◽  
Vol 14 (3) ◽  
pp. 644-651 ◽  
Author(s):  
Ayako Yamamoto ◽  
Makoto Itoh ◽  
Atsushi Fukuoka ◽  
Seiji Adachi ◽  
Hisao Yamauchi ◽  
...  
Keyword(s):  
Time Dependence ◽  
Phase Formation ◽  
Wide Temperature Range ◽  
Single Phase ◽  
Xrd Analysis ◽  
Single Step ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Time ◽  
Firing Method

We systematically studied the temperature and time dependence of phase formation of HgBa2Can−1CunO2(n+1)+δ [Hg-12(n − 1)n, n = 1, 2, 3, 4] superconductors by a single step firing method. All samples were synthesized from high-purity HgO, BaO, CaO, and CuO in a sealed quartz tube. The phase formation of Hg-12(n − 1)n was examined by both x-ray diffraction (XRD) analysis and dc susceptibility measurement. A single-phase HgBa2CuO4+δ (Hg-1201) was obtained in a relatively wide temperature range (600–850 °C), while single-phase HgBa2CaCu2O6+8 (Hg-1212) and HgBa2Ca2Cu3O8+δ (Hg-1223) were obtained only in narrow temperature and time ranges for the synthesis. The optimum temperatures for Hg-1212 and Hg-1223 were found to be 665 and 710 °C, respectively, when the sintering time was fixed for about 50 h. The HgBa2Ca3Cu4O10+δ (Hg-1234) phase was obtained as a mixture with Hg-1223.

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).

Low-Temperature Combustion Synthesis and Characterization of Ce1-xPrxO2-δ Solid Solutions

2008 ◽  
Vol 368-372 ◽  
pp. 253-255
Author(s):  
Cheng Peng ◽  
Zhen Zhang ◽  
Dong Lin Huang ◽  
Yan Li Liu
Keyword(s):  
Ignition Temperature ◽  
Combustion Process ◽  
Ammonium Hydroxide ◽  
Xrd Analysis ◽  
Synthesis And Characterization ◽  
Low Temperature Combustion ◽  
Doped Ceria ◽  
Temperature Combustion ◽  
Nitrate Solutions

Pr2O3-doped ceria nanopowders were synthesized by a nitrate-citrate combustion process. This route is based on the gelling of nitrate solutions by the addition of citric acid and ammonium hydroxide, followed by an intense combustion process due to an exothermic redox reaction between nitrate and citrate ions. XRD analysis showed that no impurity were observed up to x=0.3 in Ce1-xPrxO2-δ systems. The influence of ignition temperature on the characteristics of the powders was studied. The change of the crystal structure with the content of doped Pr was investigated. The highest ionic conductivity, σ600°C=2.45×10-3S/cm, was found for the composition of x=0.15.

Synthesis of BiFeO3-PbTiO3 Powders by Sol-Gel Auto-Combustion Process

2007 ◽  
Vol 280-283 ◽  
pp. 609-612 ◽  
Author(s):  
Hao Sheng ◽  
Zhen Xing Yue ◽  
Zhi Lun Gui ◽  
Long Tu Li
Keyword(s):  
Citric Acid ◽  
Aqueous Solutions ◽  
Ir Spectra ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Process ◽  
Combustion Method ◽  
Metal Nitrate ◽  
Auto Combustion

BiFeO3-PbTiO3 powders were synthesized by a novel sol-gel auto-combustion method. The gels, transformed from the aqueous solutions of metal nitrate and citric acid, undergo a selfpropagatingcombustion process when being ignited and yield voluminous ashes. These ashes are single phase perovskite BiFeO3-PbTiO3 powders. The redox behaviors of the dried gels were studied by DTA-TG technique and IR spectra. The synthesized powders were characterized in terms of XRD, SEM and BET techniques.

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 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 Structural analysis of Cu substituted Ni\Zn in Ni-Zn Ferrite

BIBECHANA ◽  
2021 ◽  
Vol 18 (1) ◽  
pp. 128-133
Author(s):  
Deependra Parajuli ◽  
K Samatha
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Combustion Process ◽  
Structural Parameter ◽  
Cu Doping ◽  
Zn Ferrite ◽  
Auto Combustion ◽  
High Frequency Devices ◽  
The Difference ◽  
Soft Ferrites

Ni-Zn ferrites are soft ferrites basically popular for high-frequency devices. They have low coercivity, low permeability, and higher resistivity. These properties have their own benefits on one hand but on the other hand, we can make them more efficient by doping suitable elements in order for tuning their properties for other applications. It this work, highly conducting Cu is used for substituting Ni in Ni-Zn ferrites and prepared Ni0.5-xCuxZn0.5Fe2O4 (x = 0, 0.05, 0.1, 0.15 and 0.2) samples using the sol-gel auto-combustion process. We have studied their resulting structural parameter using X-ray Powder Diffraction (XRD) and Fourier Transform Infrared (FTIR) Spectroscopy method and compared with that of Cu substituted Zn Ni-Zn ferrites. Their structures are found to be single-phase cubic spinel similar to that of Cu substituted Zn. The lattice constant increases with Cu concentration opposite to that at Zn substitution. Likewise, the size of the crystallites was not in monotonic change with the doping concentration in both cases due to internal strain and cation distribution. The difference in the pattern of XRD and FTIR of our samples indicate their different but significant properties. The changes in the structure show the effect of Cu doping and indicate the possible interesting changes in their electric, electronic, and magnetic properties. BIBECHANA 18  (2021) 128-133

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