Effect of synthesis parameters on the composition and properties of the product silica

The properties of two silica samples were studied; one sample precipitated by ammonia from a saturated (NH 4 ) 2 SiF 6 solution and the other washed out from the sublimate obtained by joint evaporation of (NH 4 ) 2 SiF 6 and SiO 2 . These silicas are fundamentally different compounds. Their chemical...

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Bibliographic Details
Published inRussian journal of inorganic chemistry Vol. 53; no. 7; pp. 1013 - 1017
Main Authors Krysenko, G. F., Mel’nichenko, E. I., Epov, D. G.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.07.2008
Subjects
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Synthesis and Properties of Inorganic Compounds
Quartz Glass
Precipitate Sample
Nujol Mull
Silica Sample
Thorium Nitrate
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Summary:The properties of two silica samples were studied; one sample precipitated by ammonia from a saturated (NH 4 ) 2 SiF 6 solution and the other washed out from the sublimate obtained by joint evaporation of (NH 4 ) 2 SiF 6 and SiO 2 . These silicas are fundamentally different compounds. Their chemical composition was determined. Evolution of samples during heating to 1000°C was interpreted using chemical analysis, IR spectroscopy, and X-ray powder diffraction. A possibility of removing fluorine and ammonia from test samples by heat and chemical treatment is demonstrated. Fluorine impurities in the form of fluoroammonium salts are removed completely during heating to 300–400°C; surface fluoride ions are removed only upon heating to 800°C.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023608070073