Halogen/hydrogen mixtures

The presence of impurities can increase nucleation densities. Higher nucleation rates can be obtained with halogen/hydrogen mixtures than with methane/hydrogen mixtures. The presence of a large amount of oxygen in a plasma etches the sp carbon phase which nucleates more easily than diamond, and the Quality and yield of diamond particles may be improved... 

Vanadium Subsilicide, V2Si, is obtained by fusing a mixture of vanadium trioxide, V2Os, and silicon, with the addition of either a large excess of vanadium or carbon or copper. The carbide or copper alloy produced is decomposed at the temperature employed.11 The silicide forms metallic prisms, of density 5-48 at 17° C., the m.pt. of which is higher than in the ease of the disilicide. It is attacked by the halogens, hydrogen chloride gas, and fused sodium or copper, but hydrochloric acid, nitric acid and sulphuric acid are without action. 

A small portion of the mixture leaks out of a pinhole and is formed into a beam (Fig. 2.14). The radicals are ionized by light from a halogen, hydrogen or rare gas resonance lamp, and then mass selected. Temporal ion signals are recorded on a multichannel scaler including a short portion of background signal before the laser is fired. 

BENZENE FLUORIDE (462-06-6) Forms explosive mixture with air (flash point 5°F/—15°C). Violent reaction with strong oxidizers, ammonium nitrate, chromic acid, halogens, hydrogen peroxide, nitric acid. Attacks some plastics, rubber, and coatings. 

Similar approaches can be used to determine activity of alkaline and alkaline earth cations, halogens, hydrogen, sulfur, and other species in gas mixtures, liquid media, and solids [2, 3, 5, 7, 15, 86-91]. As an example, for a galvanic cell with a Na" cation-conducting electrolyte and sodium metal present at the electrode, the sodium activity can be calculated from the Nemst voltage ... 

Other halogen carriers may be used, e.g., 1-2 g. of iron filings, or 1 g. of aluminium amalgam. The bromine must then be added slowly from a dropping funnel to the benzene warmed on a water bath the apparatu.s shown in Fig. II, 13, 9 is suitable and a trap for the hydrogen bromide must, however, be inserted into the top of the condenser. After all the bromine has been introduced, the mixture is heated on a water bath until no red vapours are visible above the liquid. The Subsequent procedure is as above. 

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