Single-phase magnetite with high saturation magnetization synthesized via modified solution combustion synthesis procedure

2018 ◽  
Vol 44 (16) ◽  
pp. 20267-20274 ◽  
Author(s):  
H. Aali ◽  
S. Mollazadeh ◽  
J. Vahdati Khaki
Keyword(s):  
Saturation Magnetization ◽  
Combustion Synthesis ◽  
Single Phase ◽  
Solution Combustion Synthesis ◽  
High Saturation Magnetization ◽  
Solution Combustion ◽  
High Saturation ◽  
Synthesis Procedure

Solution Combustion Synthesis of LiMn2O4 with Different Starting Reactant Compositions

2008 ◽  
Vol 368-372 ◽  
pp. 293-295 ◽  
Author(s):  
Gui Yang Liu ◽  
De Wei Guo ◽  
Jun Ming Guo ◽  
Li Li Zhang ◽  
Ke Xin Chen
Keyword(s):  
Combustion Synthesis ◽  
Reaction Rate ◽  
Single Phase ◽  
Fine Particles ◽  
Raw Materials ◽  
Solution Combustion Synthesis ◽  
Spinel Limn2o4 ◽  
Solution Combustion ◽  
Nitrate Salts ◽  
Phase Spinel

Spinel LiMn2O4 powders were prepared by solution combustion synthesis using nitrate and acetate salts as raw materials and urea as fuel. The phase composition of as-synthesized powders was identified by XRD and the microscopic structure was examined by SEM. Single-phase spinel LiMn2O4 was prepared when acetate salts were used, and the incorporation of nitrate salts resulted in the formation of Mn2O3. The products consisted of slight agglomerations of fine particles with the size of 50-200nm. It was found that the addition of nitrate salts increased the reaction rate and the yield of LiMn2O4 was depressed when more nitrate salts were used as a reactant.

Effect of Substituting Sr2+ for Gd3+ on Structural and Magnetoelectric Properties of W-Type Hexaferrite

2014 ◽  
Vol 975 ◽  
pp. 268-273
Author(s):  
Bruna da Costa Andrade ◽  
Marcelo Andrade Macedo
Keyword(s):  
Saturation Magnetization ◽  
Coercive Field ◽  
Single Phase ◽  
Sol Gel ◽  
Remnant Magnetization ◽  
High Saturation Magnetization ◽  
Electron Conduction ◽  
Magnetoelectric Properties ◽  
High Saturation ◽  
Sol Gel Process

Sr1-xGdxCo2Fe16O27-δ, (x = 0.05–0.20) was prepared via the proteic sol-gel process. Single-phase W-type hexaferrite doped with gadolinium was synthesized. The ferrite shows ferrimagnetic behavior with high saturation magnetization, low coercive field, low remnant magnetization, and a resistivity greater than 107 Ω·cm. The substitution of Sr2+ for Gd3+ improved the magnetoelectric properties of the ferrite owing to the increase in the concentration of Fe2+ and improvement of electron conduction.

LiMn2O4 Prepared by a Flameless Solution Combustion Synthesis: The Effect of Ignition Temperature

2011 ◽  
Vol 142 ◽  
pp. 213-216
Author(s):  
Gui Yang Liu ◽  
Jun Ming Guo ◽  
Yan Nan Li ◽  
Bao Sen Wang ◽  
Ying He
Keyword(s):  
Electrochemical Performance ◽  
Combustion Synthesis ◽  
Phase Structure ◽  
Ignition Temperature ◽  
Present Method ◽  
Single Phase ◽  
Raw Materials ◽  
Solution Combustion Synthesis ◽  
Solution Combustion ◽  
Micro Morphology

Spinel LiMn2O4 have been prepared by a flameless solution combustion synthesis, using nitrate and acetate salts as raw materials without any fuels. The effect of ignition temperature on the phase structure, micro morphology and electrochemical performance has been studied. The results indicate that spinel LiMn2O4 with single phase can be prepared successfully by the present method at the ignition temperatures of 300-800°C and calcination temperature of 600°C for 5h. The crystallinity, dispersity of the gains and electrochemical performance of the products increase with the decreasing ignition temperatures.

scholarly journals Soft combustion technique: Solution combustion synthesis and low-temperature combustion synthesis; to prepare Bi4Ti3O12 powders and bulk ceramics

2012 ◽  
Vol 44 (2) ◽  
pp. 211-221 ◽  
Author(s):  
Umar Al-Amani ◽  
S. Sreekantan ◽  
Ahmad Fauzi ◽  
A.R. Khairunisak ◽  
K. Warapong
Keyword(s):  
Low Temperature ◽  
Relative Density ◽  
Combustion Synthesis ◽  
Grain Orientation ◽  
Single Phase ◽  
Solution Combustion Synthesis ◽  
Low Temperature Combustion ◽  
Solution Combustion ◽  
Temperature Combustion ◽  
Soft Combustion

Bi4Ti3O12 (BTO) powders were synthesized using soft combustion techniques, specifically known as Solution Combustion Synthesis (SCS) and Low-temperature Combustion Synthesis (LCS). XRD results showed that the single phase BTO was obtained following calcinations at 800?C for the sample prepared using SCS; compared to after combustion, for the sample prepared using LCS. The TG/DTA showed a combustion temperature of around 252 - 280?C, which became stable with a single phase BTO at 500?C and above. Sintering was carried out at 1,100?C for 3 h, to determine the microstructures, grain orientation, relative density, dielectric, and ferroelectric properties, of the bulk ceramics. It was found that the bulk ceramics prepared using SCS exhibited elongated-like grains, strong (117)-preferred grain orientation, a relative density of 93.3%, ?r = 320 - 360, tan ? = 0.03 - 0.1, Pr = 6.8 ?C/cm2, and Ec = 20 kV/cm. Meanwhile, the bulk ceramics prepared using LCS showed plate-like grains, strong c-preferred grain orientation, a relative density of 83%, ?r = 143 - 195, tan ? = 0.01 - 0.38, Pr = 5.9 ?C/cm2, and Ec = 30 kV/cm.

Effect of Single or Double Calcination on LiMn2O4 Prepared by a Solution Combustion Synthesis

2011 ◽  
Vol 216 ◽  
pp. 134-137 ◽  
Author(s):  
Gui Yang Liu ◽  
Jun Ming Guo ◽  
Yan Nan Li ◽  
Bao Sen Wang
Keyword(s):  
Combustion Synthesis ◽  
Single Phase ◽  
Raw Materials ◽  
Rate Capability ◽  
Solution Combustion Synthesis ◽  
X Ray Diffraction ◽  
Solution Combustion ◽  
Micro Morphology ◽  
Acetate Mixture ◽  
Better Than

Single phase LiMn2O4 spinel powders have been prepared by solution combustion synthesis at 400 and 500°C using nitrate-acetate mixture raw materials without any fuels. The effect of single or double calcination has been studied contrastively. The phase composition and micro morphology are investigated by X-ray diffraction (XRD) and scanning electric microscope (SEM). The XRD results indicate that single phase LiMn2O4 can be obtained by single calcination at 400°C and 500°C, but there is Mn2O3 impurity in the sample prepared by double calcination at 500°C. SEM investigation exhibits that the particle size increases with raising calcination temperature or double calcination. The electrochemical performance tests indicates that the initial capacity, cyclic performance and rate capability of the samples prepared by single calcination are better than these of the samples prepared by double calcination.

Solution-Combustion Synthesis and Study of : γ-Fe2-xCrxO3(0.75 ≤ x ≤ 1.25) Maghemite-like Materials

2008 ◽  
Author(s):  
Emilio Moran ◽  
Miguel ïngel. Alario-Franco ◽  
Marco L. Garcia-Guaderrama ◽  
Oscar Blanco
Keyword(s):  
Combustion Synthesis ◽  
Solution Combustion Synthesis ◽  
Solution Combustion
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