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Thermal and optical properties of La 2 O 3 –Ga 2 O 3 – (Nb 2 O 5 or Ta 2 O 5 ) ternary glasses
Author(s) -
Yoshimoto Kohei,
Masuno Atsunobu,
Ueda Motoi,
Inoue Hiroyuki,
Yamamoto Hiroshi,
Kawashima Tatsunori
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15484
Subject(s) - refractive index , materials science , analytical chemistry (journal) , thermal stability , wavelength , transmittance , crystallization , infrared , ternary operation , thermal , optics , optoelectronics , chemistry , physics , thermodynamics , organic chemistry , chromatography , computer science , programming language
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.