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Which outcome results when silicon dioxide undergoes devitrification at high temperature?

A)Crystallization begins within the amorphous structure
B)Thermal conductivity irreversibly decreases notably
C)Refractive index becomes unexpectedly isotropic
D)Viscosity suddenly decreases without phase-change

💡 Explanation

Devitrification causes crystallization because it's a phase transformation from an amorphous solid to a crystalline solid; the increased order releases energy via the nucleation mechanism. Therefore, crystallization throughout the volume occurs rather than remaining completely amorphous, which is its initial condition.

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