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By Mario Affatigato

Presents a cutting-edge number of contemporary papers on glass and optical fabrics as offered on the sixth Pacific Rim convention on Glass and Optical fabrics. Sections on constitution and homes, optical purposes, glass modeling, and business purposes are included.Content:

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Extra resources for Advances in Glass and Optical Materials II: Ceramic Transactions Series, Volume 197

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Therefore, a large number of researches have been done as for the relation between refractive index and glass composition. Among the theoretical expressions, the Lorentz-Lorenz equation1'2 relates the polarizability a to the refractive index n as follows. ILzly »2+2 m =ίπΝ„=-πΝΥχαι m 3 3 r (I) where Vm is the molar volume, N is Avogadro's number, a m is the molar polarizability, *,- is the ionic ratio, a, is the polarizability of the constituent 1 in a material. In Eq. 2, and hence larger n is achieved in the materials with smaller Vm and larger α,.

17 at which the thermal expansion coefficient exhibits the broad minimum. 16 in the Anderson-Griineisen constants shown in Figure 13. The same correspondence can be found between the Poisson's ratio and the Anderson-Grüneisen constants of sodium borate glasses. Figure 1. Density of alkali borate glasses against composition x. 28 · Advances in Glass and Optical Materials II Ultrasonic Velocity and Elastic Properties of Alkali Borate Glasses Figure 2. Velocity of sound in five binary systems of alkali borate glasses against composition x.

Ol s binding energy Fig. 3 shows the relation between Ols binding energy and refractive index. Ols binding energy is a measure of basicity of oxide ion; with increasing the electron density in the valence region, that is, with increasing the basicity, the binding energies of core orbitals such as Ol s shift to lower energy side. When the network forming and intermediate oxides are added to TeÛ2, Ols binding energy increases, and in the case of alkali addition, the binding energy decreases. It is expected that the electron density in the valence region is related to the polarizability.

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