Previous studies on glass formation involving GeO 2 with Bi 2 O 3 , TI 2 O, and PbO were extended by the use of Sb 2 O 3 . Wide areas of glass formation occur in the systems GeO 2 ‐PbO‐Sb 2 O 3 and GeO 2 ‐Bi 2 O 3 ‐Sb 2 O 3 at all but the lowest GeO 2 contents; the region of single‐phase glasses in the system GeO 2 ‐Tl 2 O‐Sb 2 O 3 is severely restricted. Glasses were examined by powder X‐ray diffraction, differential thermal analysis, thermomechanical analysis, and Archimedes’technique to obtain glass transition and crystallization exotherm temperatures, thermal expansion coefficients, and densities; these properties are presented in diagrams for the GeO 2 ‐Sb 2 O 3 binary and for two ternary systems. Based on calculated values of Δ o ,the waveleneth for zero material dispersion. and dM/dΔ . the material disiersion slope at Δ o , compositions in these systems may be useful for the construction of ultralow‐loss optical waveguides in the 3 to 4 μm region.
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Nassau et al. (1983) studied this question.
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