Glasse halide

Halex reaction Halfan [36167-63-2] Half-life data Half-lives Halftones Halide glasses Halide ions Halides... 

Collecting the silver halide. Meanwhile assemble the apparatus shown in Fig. 91. G is a filter-funnel having a sintered glass filter-plate... 

Quartz glass Quartz-halide bulbs Quartz halogen lamp Quartzite... 

The commercially available photochromic glasses contain a fine dispersion of silver halide crystallites which ate about 10 nm in diameter and about... 

Halide Displacement. Hahde displacement is a method used to prepare thiols that are not readily available by normal means. It requires a two-phase, water—organic system, that can be quite corrosive. Normally, this type of reaction, a classic Sj 2 type, is undertaken in HasteUoy or glass-lined... 

Halide Glasses. Fluoride glasses are the most important of the haUde glasses. The only primary fluoride glass former is beryUium fluoride,... 

Table 1. Composition of a Silver Halide Photochromic Glass ...

Although the proposed appHcations for photochromic systems are numerous, few have received broad use. By far, the most successful commercial apphcation is the use of photochromic silver halide-containing glasses in prescription eyewear. The convenience of having lenses that darken automatically upon exposure to sunlight has proven appealing to spectacle wearers (35). With the increasing penetration of plastic lenses into the ophthalmic market, the desire for plastic photochromic ophthalmic lenses has also increased, and considerable effort has been spent on the discovery of photochromic systems for plastic eyewear. 

Tetramethylsilane (TMS) [75-76-3] M 88.2, b 26.3, n 1.359, d 0.639. Distilled from cone H2SO4 (after shaking with it) or LiAlH4, through a 5ft vacuum-jacketted column packed with glass helices into an ice-cooled condenser, then percolated through silica gel to remove traces of halide. 

Slides Plastic cavitation around inclusions in metals (e.g. metallographic section through neck in tensile specimen) SEM pictures of fracture surfaces in ductile metals, glass, alkali halide crystals. 

Many inorganic solids lend themselves to study by PL, to probe their intrinsic properties and to look at impurities and defects. Such materials include alkali-halides, semiconductors, crystalline ceramics, and glasses. In opaque materials PL is particularly surface sensitive, being restricted by the optical penetration depth and carrier diffusion length to a region of 0.05 to several pm beneath the surface. 

Attempts by Kao and others to enhance transparency by chemically removing impurities from glass met with little success the level of purity required was indeed comparable with that needed in silicon for integrated circuits. In the event, the required purification was achieved in the same way in which semiconductor-grade silicon is now manufactured, by going through the gas phase (silicon tetrachloride), which can be separated from the halides of impurity species because of dilTerences in vapour pressures. This breakthrough was achieved by R.D. Maurer and his... 

Organic acids yield lemon-yellow zones on a blue background [1]. Halide ions migrate as ammonium salts in ammoniacal mobile phases and are also colored yellow. The colors fade rapidly in the air. This can be delayed for some days by covering the chromatogram with a glass plate. 

The mixed halides TeClFs and TeBrFs are made by oxidative fluorination of TeCU or TeBr4 in a stream of Fi diluted with N2 at 25°. Under similar conditions Tel4 gave only TeFg and IF5. TeClFs can also be made by the action of GIF on TcF4, TeCU or Te02 below room temperature it is a colourless liquid, mp —28°, bp 13.5°, which does not react with Hg, dry metals or glass at room temperature. 

Due to the above requirements, typical optically-transparent materials, such as oxides (glass, quartz, alumina, zirconium oxide etc.) and halides (sodium chloride, lithium fluoride, calcium fluoride, potassium bromide, cesium bromide etc.) are usually unsuitable for use with fluoride melts. Therefore, no standard procedure exists at present for the spectral investigation of fluoride melts, and an original apparatus must be created especially for each particular case. 

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