Abstract
ZnO surface crystallized glass-ceramics were fabricated using K 2O-CaO-ZnO-B 2O 3-SiO 2-Al 2O 3 glass system. Precipitation of Zn-containing oxide crystallites was affected by the chemical composition of borate glass, especially the amount of Al 2O 3. Substitution of SiO 2 for B 2O 3 brought selective crystallization of ZnO without precipitation of α-Zn 3B 2O 6. ZnO-precipitated glass-ceramics showed surface crystallization with submicron-sized crystallites, which assured transparency of these glass-ceramics. The obtained glass-ceramic shows free exciton emission, which is similar to emission of ZnO single crystal.
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