Nitrogen nitride synthesis

The first stage of nitride synthesis from its constituents is the dissolution of nitrogen in liquid metal. This process was analysed [9,10] by ab initio quantum mechanical calculations using the density functional theory (DFT) approximation [11-13],... 

Nitride synthesis is a very well known reaction in materials science which has b n solved satisfactorily in most cases with classical methods. Generally one applies the chemical vapor deposition or works with powders reacting at high temperature (T 1500 °K) in nitrogen or ammonia. Unfortunately the reaction times are very... 

The invention of cubic boron nitride (CBN) is closely linked to the synthesis of artificial diamond. Cubic boron nitride synthesis was conducted first in 1957. CBN crystals are produced from boron and nitrogen at high pressures of 50-90 kbar, high temperatures between 1,800 °C and 2,700 °C, and in the presence of a catalyst (Klocke 2009). During the first years on the market, CBN was seen as a competitor to diamond. However, CBN proved to be a better material for machining of hard-to-machine ferrous materials than diamond due to the missing chemical affinity and the higher thermal stability. 

Combustion of Ferrochromium in Nitrogen and Synthesis of Chromium Nitride I 213... 

Combustion ofFerroboron in Nitrogen and Synthesis of Boron Nitride 215... 

According to the thermodynamic calculation, it is possible to make a conclusion that all presented SHS-Az systems can be self-igniting. Moreover, combusting temperatures and reaction heat are sufficient for base products formation. The presence of the active nitrogen and fuel elements without oxide layer is a supposition for the positive result of nitride synthesis by azide technology. At that, formation reactions of some nitrides are carried out in the gas-vapor phase, that allows to get nano-sized nitride powders. 

Fischer A, Antonietti M, Thomas A (2007) Growth confined by the nitrogen source synthesis of pure metal nitride nanoparticles in mesoporous graphitic carbon nitride. Adv Mater Weinheim 19 264—267... 

Material System. There are two basic techniques for the industrial synthesis of Si3N powder, although other methods are available (36). The older and most widely used method is the nitridation of siHcon. SiHcon is heated in a nitrogen [7727-37-9] atmosphere at temperatures of 1100—1450°C in... 

Vapor—sohd reactions (13—17) are also commonly used ia the synthesis of specialty ceramic powders. Carbothermic reduction of oxides, ia which carbon (qv) black mixed with the appropriate reactant oxide is heated ia nitrogen or an iaert atmosphere, is a popular means of produciag commercial SiC, Si N, aluminum nitride [24304-00-3], AIN, and sialon, ie, siUcon aluminum oxynitride, powders. 

The reverse reaction to ammonia synthesis, the decomposition to nitrogen and hydrogen, is used in die nitriding of iron and canied out industiially at temperatures around 800 K and atmospheric pressure to produce surfacehardening. This dissolution reaction must also play a part in the synthesis of ammonia by the industiial process. The attempt to ninide non by reaction with nin ogen gas is vety slow under atmospheric pressure, presumably due to the stability of the nitrogen molecule. 

In spite of the hazardous nature of Sc4N4, this binary selenium nitride has been used for the synthesis of other Se-N compounds, all of which have sulfur analogues (Scheme 5.2). " However, safer alternatives to the use of Sc4N4, e.g., selenium-nitrogen halides and silicon-nitrogen-selenium reagents, are available for the development of Se-N chemistry. ... 

For the generation of more nitrogen-rich compounds, a nitride is included in the reaction. This synthesis allows the formation of different nitridoborate (8) ions as well as nitridoborate nitrides (9) [26] ... 

The discovery in 1973 that polysulfur nitride (SN)X, a polymer comprised only of non-metallic elements, behaves as a superconductor at 0.26 K sparked widespread interest in sulfur-nitrogen (S-N) chemistry. In the past 30 years, the field of inorganic S-N chemistry has reached maturity and interfaces with other areas of chemistry, e.g., theoretical chemistry, materials chemistry, organic synthesis, polymer chemistry and biochemistry, have been established and are under active development. This interest has been extended to Se-N and, to a lesser extent, Te-N systems. 

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