silicon dioxide

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silicon dioxide:

see silicasilica
or silicon dioxide,
chemical compound, SiO2. It is insoluble in water, slightly soluble in alkalies, and soluble in dilute hydrofluoric acid. Pure silica is colorless to white.
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silicon dioxide

[′sil·ə·kən dī′äk‚sīd]
(inorganic chemistry)
SiO2 Colorless, transparent crystals, soluble in molten alkalies and hydrofluoric acid; melts at 1710°C; used to make glass, ceramic products, abrasives, foundry molds, and concrete.

silica, silicon dioxide

A white or colorless substance, nearly insoluble in water and in all acids except hydrofluoric; extremely hard; fuses to a colorless amorphous glass.

silicon dioxide

(SiO2) A hard, glassy mineral found in materials such as rock, quartz, sand and opal. In metal oxide semiconductor (MOS) chip fabrication, silicon dioxide is used to create the insulation layer between the metal gates of the top layer and the silicon elements below. See silica gel.
References in periodicals archive ?
Rule block database is design based on the obtained and measured SiO2 coating sputtering experiment results, which are shown in table 1.
-- 13.5m @ 33.3% avail Al2O3 (46.6% total), 1.8% SiO2 (reactive) from 1m
Major Elements: The results indicate that SiO2 and Al2O3 are most abundant because of the dominance of quartz, feldspar and clay (Table I).
Como en total tenemos 5 variables (porcentaje de SiO2, Al2O3, MgO, K2O y Na2O), se busca mediante el ACP normado (datos normalizados) establecer un numero menor de variables que me recojan la mayor parte de informacion con el fin de facilitar la interpretacion y visualizacion de la informacion.
Measure modified SiO2 at different amount from absolute PVB, and blend it under the influence of ultrasonic.
The reaction between Zn (OH) 2 and SiO2 or Al2O3 can make the solid particles become bigger, which lead to particles settle down easily.
Application of 100 kg N ha-1 + 60 kg SiO2 ha-1 to Peizataifeng showed higher GS and SPS activity at booting, and gave the highest head rice rate.
According to [4] diagram, which is drawn according to Na2O and K2O quantities in SiO2 and distinguishes the two magma alkaline and sub-alkaline quantities, all samples are categorized under sub-alkaline (fig.4).
- Felicitas, BRL & Yankuang JV total resource (unbeneficiated) increased to - 147.9Mt @ 39.4% Al2O3 (total), 30.1% Al2O3 (available), 1.9% SiO2 (reactive) including Measured Resource (unbeneficiated) of - 35.3Mt @ 39.0% Al2O3 (total), 30.5% Al2O3 (available), 1.3% SiO2 (reactive)
These weakest pad structures came into general use in the 1990's with planarized SiO2 films and tungsten (W) vias.
Preparation of glass: Glasses with compositions 30SiO2-40CaO-18P2O5-12ZrO 2 in Wt % was prepared by melt quenching techniques appropriate amount of analytical grade SiO2, CaO, P2O 5, ZrO2 were weighed and thoroughly mixed in an Agate Pestle and Mortar.
The pellets have a low silica content of 2.23% SiO2, low phosphorous and low sulphur content as well.