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(Color online) XRD patterns of (a) (Ref. 20); (b) the as-prepared glass; (c) the heat-treated one at for ; (d) the heat-treated one at for ; (e) the polycrystalline prepared through a melt-slowly cooling method in a silica tube at a temperature for ; (f) the heat-treated one at for ; (g) polycrystalline (Ref. 16).
(Color online) Raman spectra of (a) ; (b) (Ref. 16); (c) the glass heat treated at , (d) heat treated at , (e) heat treated at ; (f) the as-prepared one.
(Color online) Optical transmission spectra (uncorrected for reflection and scattering losses) of the as-prepared glass and the heat-treated ones at for 2 or .
SEM image of the transparent nanocrystallized glass fabricated at for .
(Color online) Maker fringe patterns of the as-prepared glass and the transparent nanocrystallized ones fabricated at for 2 (black) or 7 (green) days. The maximum of SH intensity for the reference -cut quartz is set to 1.
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