Aluminum-nitrogen systems

Aluminum nitride (AIN) is the only major compound known in the aluminum-nitrogen system (a nitrogen rich phase, AIN9 is also reported). It is formed by the reaction of NH3 and AIH3 and may be a stable phase of the condensed Al-N system. )... 

Although the traditional Oppenauer conditions utilized aluminum catalysts, alternative metal alkoxides, for example, chloromagnesium alkoxides, are competent in the transformation.3 In 1945, Woodward devised a new system, which involved the use of potassium r-butoxide, and benzophenone for the oxidation of quinine (29) to quinone (30).13 This was termed the modified Oppenauer oxidation. The traditional aluminum catalytic system failed in this case due to the complexation of the Lewis-basic nitrogen to the aluminum centre. The synthetic flexibility of this procedure was extended by the use of more potent hydride acceptors.46... 

An overview of synthetic routes to aluminum-nitrogen polymer precursors for AIN ceramics has been presented. The most usefiil systems give precursors which can be... 

Currently, systems for measuring the hydrogen content in molten aluminum are commercially available. In the most common systems, an inert gas (usually nitrogen) flows through a probe and over the molten metal, such that chemical equilibrium between the hydrogen partial pressure in the gas and the concentration of hydrogen in the... 

Figure 9.14 reports the data for titanium reacting with air and another 02-N2 mixture at 1 atm under stoichiometric conditions. The temperature-pressure variation for the pure 02-Ti system is also detailed on Fig. 9.13. Table 9.4 reports data similar to those in Table 9.3 for the aluminum system. Note that point 3 (Ti-air) has a combustion temperature of 3450 K and a partial pressure of the non-nitrogen decomposition gases of 0.10 atm. The Ti-02 system...

A 500-ml. one-necked flask with a side arm to admit nitrogen is fitted with a reflux condenser protected at the top by a T-tube through which nitrogen is slowly passed during the entire reaction (Note 1). In the flask there is placed 12 g. (0.44 g. atom) of aluminum wool (Note 2), and the system is thoroughly dried by flaming (Note 3) and then cooled to room temperature. A posi-... 

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