By M.A. Popescu
The earliest experimental facts on an oxygen-free glass were released via Schulz-Sellack in 1870 . afterward, in 1902, wooden , in addition to Meier in 1910 , performed the 1st researches at the optical houses of vitreous selenium. The curiosity within the glasses that show transparency within the infrared zone of the optical spectrum rose in the beginning of the 20th century. to begin with have been investigated the heavy steel oxides and the transparency restrict used to be prolonged from (the case of the classical oxide glasses) as much as wavelength. with the intention to expand this restrict above the scientists attempted the chemical compositions in keeping with the weather of the 6th workforce of the Periodic desk, the chalcogens: sulphur, selenium and tellurium. The systematic study within the box of glasses in accordance with chalcogens, known as chalcogenide glasses, began on the center of our century. In 1950 Frerichs  investigated the glass and released the paper: “New optical glasses obvious in infrared as much as 12 . numerous years later he began the examine of the selenium glass and ready a number of binary glasses with sulphur . Glaze and colleagues  constructed in 1957 the 1st process for the practise of the glass on the business scale, whereas Winter-Klein  released reviews on a number of chalcogenides ready within the vitreous country.
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Extra resources for Non-Crystalline Chalcogenicides (Solid-State Science and Technology Library)
ALKALI-CHALCOGENIDE SYSTEMS The first data on the glass formation in the alkali-chalcogenide systems were published in 1982 for the case of Cs-Se binary system . Minaev  has calculated the ability to form glasses in the alkali metal-chalcogen systems on the basis of an original theory of glass function: the so-called "energostructural theory". The theory comprises a structural model of the glass and allows for drawing conclusions on the relation between various chemical-bonding forces, which act, into the network.
Cubic structure and Å. 30). 65 Å , respectively. In the system Ge-Sb-S the glass formation region is not very large. 31a) . 30. The projection in the plane (110) of the structure. The glass of composition situated on the boundary of the glass formation domain for low quenching rates, has been used in the experiment “Crystal” placed on the spatial complex “Soyuz-Salyut 6”. There was demonstrated that the glass prepared in zero gravitation is more resistant to crystallisation than the glass prepared in normal gravitation conditions and, in the first case, a considerable enlargement of the vitrification region it is expected .
The most advanced character is realised in and this feature allows supposing a tetrahedral co-ordination of selenium around phosphorus, as opposite to the trigonal co-ordination in In do appear P-P bonds and their number rises when the composition is shifted towards and then to The molecules and are formed without difficulty in these alloys. In the system P-Se have been obtained amorphous films with the thickness of in a large compositional range, by deposition from vapour phase on solid substrate .