High Index of Refractive Glasses

The Synthesis and Fabrication of Ceramics for Special Appiication 17.3.2. Preparation of Giasses for Special Appiications 17.3.2.3. High Index of Refractive Glasses... 

High Index of Refractive Glasses 17.3.2.3.1. Glass Composition. 

Glass, high lead A low melting point, high index of refraction glass that contains a high percentage of lead oxide. 

Lead oxide is used in producing fine "crystal glass" and "flint glass" of a high index of refraction for achromatic lenses. The nitrate and the acetate are soluble salts. Lead salts such as lead arsenate have been used as insecticides, but their use in recent years has been practically eliminated in favor of less harmful organic compounds. 

When a light beam propagating through a transparent medium 3 of high index of refraction (e.g., glass) encounters an interface with medium 1 of lower... 

Due to the atomic structure of the 4 f-shell there are narrow and sharp absorption and/or emission lines in the visible range v ch may be used in various ways. In addition the oxides and/or oxide systems in glasses provide a high index of refraction with low dispersion. 

In the application of lanthanum oxide in glass use is made of the high index of refraction and the lack of color of this oxide. So today optical glasses with up to 40 % lanthanum oxide are made vhich are corrosion resistant. 

New developments have been made in the photographic and optical field with the design of more sophisticated lenses. The lanthanum optical glasses with a high index of refraction and low dispersion have been an outgrowth of the post war period. 

PS has a high index of refraction (1.592) and hence has excellent transparency to visible light. PS is a brittle polymer with a glass transition temperature rgof 100 C, a heat deflection temperature of 90 C, and a solubility parameter of 9.1 H. 

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