Question:
\(\ldots\ldots\ldots\ldots\ldots\) oxide promotes Devitrification.
\(\ldots\ldots\ldots\ldots\ldots\) oxide promotes Devitrification.
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Devitrification means crystallization in glass. \(CaO\) can promote devitrification by encouraging crystalline phase formation.
Updated On: May 7, 2026
- \(SiO_2\)
- \(Na_2O\)
- \(CaO\)
- \(K_2O\)
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The Correct Option is C
Solution and Explanation
Devitrification is the formation of crystalline phases in glass.
Glass is normally amorphous.
When crystals form inside glass, the glass loses transparency and uniformity.
This crystallization process is called:
\[
\text{Devitrification}.
\]
Certain oxides promote crystallization in glass.
Calcium oxide:
\[
CaO
\]
can promote devitrification by encouraging formation of calcium silicate or related crystalline phases.
If devitrification occurs, glass may become cloudy or mechanically defective.
Silica is the main network former.
Sodium oxide and potassium oxide are common alkali modifiers that lower melting temperature.
But in the given options, the oxide that promotes devitrification is:
\[
CaO.
\]
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