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Effect of Urea on Synthesis of Ceramics Materials by the Modified Combustion Method

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Cruz D., Ortíz-Oliveros H., Rivera Zepeda A., Rosano-Ortega G., Tepale Ochoa A.

Acta Physica Polonica A

2015

vol. 128

issue 3

336-339

The proportion of urea in the modified combustion method to prepare lithium metasilicate (Li₂SiO₃) powders was investigated. Reactions were performed using LiOH:H₂SiO₃:CH₄N₂O in molar ratios of 1:1:1, 1:1:2, 1:1:3, 1:1:4 and 1:1:5 which were heated at 450°C during 5 min. It was found, by X-ray diffraction, that LiOH:H₂SiO₃:CH₄N₂O in the ratio of 1:1:3 was the more adequate molar ratio to produce mainly Li₂SiO₃. It was observed that excess of urea produced mainly silicium dioxide (SiO₂) in coesite phase instead Li₂SiO₃. Thermogravimetric analyses showed that decomposition products of urea, such as biuret, cyanic acid and cyanuric acid, were found in samples prepared with high proportions of urea (1:1:4 and 1:1:5). Carbonates identified by IR spectroscopy were found in samples prepared with LiOH:H₂SiO₃:CH₄N₂O in 1:1:1, 1:1:2, 1:1:3, 1:1:14 and 1:1:5 molar ratios.

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1 Acta Physica Polonica A

1 2015

1 Cruz D.

1 Ortíz-Oliveros H.

1 Rivera Zepeda A.

1 Rosano-Ortega G.

1 Tepale Ochoa A.

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Effect of Urea on Synthesis of Ceramics Materials by the Modified Combustion Method