Chalcogenide glass composites

A direct potentiometric measurement of N02 in air appeared possible by means of a properly activated Fe-chalcogenide glass electrode158 with the approximate composition SegoGe Sbu doped with 1.7 -2% of Fe it yields a positive potential shift when equilibrated with N02 in the presence of air, being insensitive to NO, S02, CO and CH4. 

The most interesting glass compositions are derived from the elements of gronps 6 and 7 of the periodic table, that is, the oxides, chalcogenides, and hahdes. A very specific class of vitreons materials is represented by a new family of noncrystalline solids, the so-called metglasses or metallic glasses their prodnction is special in the sense that they require very rapid quenching of an alloy melt. 

Chemical nature of photoresists, the chemistries involved in the photolithography, the properties of photoresists are briefly described. The discussion includes diazonaphthoquinone/novolac positive photoresists, polymer-aromatic diazide negative photoresists, photopolymerizable compositions, chalcogenide glass using systems, chemically amplified photoresists, and photoresists with an image formation in a thin layer. 

Table 13.1 Composition and properties of representative chalcogenide glasses (After Yamane and Asahara, 2000).

Fig. 3. Composite loss spectra for some common IR fibre optics ZBLAN fluoride glass SC sapphire, chalcogenide glass, PC AgBrCl, and hollow glass waveguide plot reproduced from Harrington, 2010.

TABLE 1. Values of -log ct20 c> Eo> H of Binary Chalcogenide Glasses Obtained by Combining Elements of Groups V and VI of the Periodic System (compositions of the glasses correspond to the characteristic valence of the elements of group V)... 

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