Thermal and optical properties of La₂O₃–Ga₂O₃– (Nb₂O₅ or Ta₂O₅) ternary glasses

Abstract

La 2 O 3 -Ga 2 O 3 -M 2 O 5 (M = Nb or Ta) ternary glasses were fabricated using an aerodynamic levitation technique, and their glass-forming regions and thermal and optical properties were investigated. Incorporation of adequate amounts of Nb 2 O 5 and Ta 2 O 5 drastically improved the thermal stabilities of the glasses against crystallization. Optical transmittance measurements revealed that all the glasses were transparent over a wide wavelength range from the ultraviolet to the mid-infrared. The refractive indices of the glasses increased and the Abbe number decreased upon substituting Ga 2 O 3 with Nb 2 O 5 , and the decrease in the Abbe number was significantly suppressed when Ta 2 O 5 was incorporated into the glass. As a result, excellent compatibility between high refractive index and lower wavelength dispersion was realized in La 2 O 3 -Ga 2 O 3 -Ta 2 O 5 glasses. Analysis based on the single-oscillator Drude-Voigt model provided more systematical information and revealed that this compatibility was due to an increase in the electron density of the glass. K E Y W O R D S glass, optical materials/properties, thermal properties

Understanding the structure, thermal, and optical properties in Al2O3‐incorporated La2O3‐TiO2‐Nb2O5 glasses

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