Microwave assisted solid state reaction synthesis of MgAl2O4 spinel powders

Ganesh, Ibram; Srinivas, B.; Johnson, Roy; Saha, Bhaskar; Mahajan, Y. R.

doi:10.1016/s0955-2219(03)00602-2

Cited by 101 publications

(91 citation statements)

References 10 publications

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“…From this point of view, these results are in consistency with those reported by other authors. [16,[23][24][25][26] The amorphous character of the powders obtained by using a single fuel represents conclusive evidence, which stands for the hypothesis that Mg(NO 3 ) 2 and Al(NO 3 ) 3 exhibit an essentially different behaviour with respect to the same fuel. As a result, when a single fuel is used for the synthesis of MgAl 2 O 4 , be it MEA -the most suitable fuel for Mg(NO 3 ) 2 -or be it urea -the most appropriate fuel for Al(NO 3 ) 3 -one of the two metal nitrates will act as a moderator or as an inhibitor of the combustion reaction.…”

Section: Mgal 2 O 4 Low-temperature Combustion Synthesismentioning

confidence: 95%

“…Therefore, all the articles reporting the combustion synthesis of magnesium aluminate recommend the use of a single fuel for both metal nitrates, magnesium nitrate and aluminium nitrate: urea, [22][23][24][25] citric acid, [26] alanine, [16] sucrose. [23][24][25] According to the results reported by these authors [16,[22][23][24][25][26] the reaction product obtained right from the combustion reaction is amorphous or poorly crystalline, often being contaminated with residual carbon originating from the incomplete evolution of the combustion reaction. As a consequence, the formation of MgAl 2 O 4 as a single crystalline phase is achieved only after annealing the previously combustion-synthesized powder.…”

Section: Introductionmentioning

confidence: 99%

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Application of New Organic Fuels in the Direct MgAl₂O₄ Combustion Synthesis

et al. 2008

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The paper presents a new version of MgAl 2 O 4 solution-combustion synthesis, based on the individual reactivity of Mg(NO 3 ) 2 and Al(NO 3 ) 3 with respect to various fuels. Beside the traditionally used fuels (urea, glycine, β-alanine), new organic reducing agents [monoethanolamine, triethanolamine, tris(hydroxymethyl)aminomethane and triethylenetetramine] have also been used. The study of the individual reactivities of Mg(NO 3 ) 2 and Al(NO 3 ) 3 with respect to each of the previously mentioned fuels suggested that there is a predilection of the two metal nitrates for certain fuels: urea is the optimum fuel for Al(NO 3 ) 3 , whereas monoethanolamine represents the most suitable fuel for Mg(NO 3 ) 2 . It has been shown by X-ray diffraction and thermal analysis that the use of a single fuel

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Section: Mgal 2 O 4 Low-temperature Combustion Synthesismentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Application of New Organic Fuels in the Direct MgAl₂O₄ Combustion Synthesis

et al. 2008

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“…The reason for higher surface area in PVA method can be attributed to the greater amount of gas that evolved during poly vinyl alcohol combustion. The evolved gases generally prevent from agglomeration of powder during the reaction, by considering that the agglomeration reduce surface area in powder processing [8].…”

Section: Resultsmentioning

confidence: 99%

“…However, fabrication of such a high-purity transparent spinel body from a powder obtained by conventional solid-state reaction routes is very difficult. [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Nanorefractory Dimetaloxide Spinel

Torkian

Amini

Bahrami

2010

e-J. Surf. Sci. Nanotechnol.

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The aim of this work consists of synthesis of nanocrystalline single-phase MgAl2O4 powders from comparatively less expensive raw materials and simple methods. We have used conventional heating in two different chemical routes, co-precipitation and combustion methods. In the first procedure combination of precipitation and gelation process is used to prepare spinel from aluminum and magnesium sulfates. The other involved a rapid evaporation of polyvinyl alcohol (PVA) that added to a mixed metal nitrate solution, followed by pyrolysis of the dried mass. X-ray diffraction patterns show that obtained nanoparticles are pure and single-phase. Sizes of nanoparticles were calculated by Scherrer equation. Data indicate that the average size of nanoparticles is around 30 nm. SEM images confirmed the results of XRD patterns and show that the nanoparticles prepared via these chemical routes had spherical shape with homogenous morphology. The surface areas of the prepared powders (SBET) were measured and compared to each other.

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“…The high water resolution of urea is derived from heavy hydrogen bonds between water and urea [10]. Urea can be used as a fuel in microwave reactions due to its high bonding energy and easy inflammability with intensive heat and gas output.…”

Section: Introductionmentioning

confidence: 99%

A System of B-C-N-O: Synthesis, Characterization and Determination of Unit Cell Parameters

Gül

Kurtuluş

2017

Acta Phys. Pol. A

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Boron-rich solids are good candidates to apply instead of diamond. Boron has a unique crystal structure and compounds of it are resistant to heat treatment. These structures have light density, high hardness, and chemically inertness. Also, boron compounds display thermal and electronic properties as a thermoelectric power at high temperatures. A boron, carbon, nitrogen, and oxygen containing compound was synthesized for the first time by classical microwave method using elemental amorphous boron, active carbon, and urea with 1:1:1 molar ratio. The compound is crystallized in monoclinic system with unit cell parameters a = 12.9575 Å, b = 9.3264 Å, c = 9.6529 Å, β = 113.277• which are calculated by POWD indexing program. The X-ray diffraction, POWD, the Fourier transform infrared, scanning electron microscopy/energy X-ray diffraction spectroscopy and thermogravimetric/different thermal analysis were achieved.

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Microwave assisted solid state reaction synthesis of MgAl2O4 spinel powders

Cited by 101 publications

References 10 publications

Application of New Organic Fuels in the Direct MgAl₂O₄ Combustion Synthesis

Application of New Organic Fuels in the Direct MgAl₂O₄ Combustion Synthesis

Synthesis and Characterization of a Nanorefractory Dimetaloxide Spinel

A System of B-C-N-O: Synthesis, Characterization and Determination of Unit Cell Parameters

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Microwave assisted solid state reaction synthesis of MgAl2O4 spinel powders

Cited by 101 publications

References 10 publications

Application of New Organic Fuels in the Direct MgAl2O4 Combustion Synthesis

Application of New Organic Fuels in the Direct MgAl2O4 Combustion Synthesis

Synthesis and Characterization of a Nanorefractory Dimetaloxide Spinel

A System of B-C-N-O: Synthesis, Characterization and Determination of Unit Cell Parameters

Contact Info

Product

Resources

About

Application of New Organic Fuels in the Direct MgAl₂O₄ Combustion Synthesis

Application of New Organic Fuels in the Direct MgAl₂O₄ Combustion Synthesis