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← ScienceWhich 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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