Electrical properties of a partially crystallized aluminosilicate glass containing TiO2 and Nb2O5
A two-stage heat treatment of an aluminosilicate glass containing both TiO2 and Nb2O5 may be used to precipitate a fine dispersion of doped TiO2 crystals within a glassy matrix. The resulting partially crystalline product exhibits the properties of a semiconducting material with activation energies for conduction ranging from 0.2 to 0.35 eV. The d.c. conductivity of the specimens has been shown to be related to the size of the TiO2 crystals. With prolonged crystallization treatment a second non-conducting crystalline phase, anorthite, reduces the conductivity of the glass-ceramics.
KeywordsPolymer TiO2 Crystallization Activation Energy Heat Treatment
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