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Thermal decomposition of magnesium nitrite yields magnesium and nitrogen

wallpapers Products 2021-04-14
Thermal decomposition of magnesium nitrite yields magnesium and nitrogen (700-1500°C).
The stability and formation of new nitrogen-rich nitrides (N/Mg ratio equal to or greater than 1) at high pressures were proposed and later discovered. These include Mg2N4 and Mgn4 solids, both of which become thermodynamically stable around 50 GPa. Mg2N4 consists of exotic cis-tetraazitrigen-N44 − species with an N-N bond order close to 1. The Mg2N4 compound was recovered to environmental conditions together with the N44− unit, and only the fourth polynitrogen entity that was stable under environmental conditions was labeled.
High-quality Mg3N2 powder was prepared by direct nitriding reaction of Mg powder and N2 gas at 650℃~ 800℃ for 60 min at 1.0 L /min. The thermal nitriding behavior of magnesium powder was studied by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). X-ray diffraction (XRD) shows that the Mg3N2 powder has a cubic structure with a lattice constant of 0.997 nm. Scanning electron microscopy (SEM) images of Mg3N2 powder showed that the Mg3N2 powder had a rod-like structure. Fourier transform infrared spectroscopy (FTIR) showed that the Mg3N2 powder prepared by this method was of high quality.
The magnesium nitride study highlights
High-quality magnesium nitride (Mg3N2) powder was successfully synthesized from magnesium powder by direct nitriding with 1.0 L /min N2 at 650℃~ 800℃ for 60 min. The direct reaction of magnesium powder with N2 is a valuable method for large-scale industrial reactions. The TGA and DTA curves of Mg powder in the Ar atmosphere show that the melting point of metal Mg is 650℃. At a temperature of about 689 ° C, some of the liquid Mg will vaporize into the gaseous Mg. The higher the temperature, the faster the evaporation rate. The DTA and TGA curves of Mg powder under the N2 atmosphere show that the initial thermal nitriding occurs at about 550℃. The higher the temperature, the faster the nitriding rate. X-ray diffraction (XRD) showed that the Mg3N2 powder had a cubic structure and the lattice constant a = 0.997 nm, which was in good agreement with the value (0.995 nm) published in the JCPDS literature. The SEM image of Mg3N2 powder showed that the Mg3N2 powder had a rod-like structure. At low temperatures, there are clear edges and corners that become smoother as the temperature rises. The Fourier transform infrared spectra of Mg3N2 powders showed that the Mg3N2 powders prepared by this method were of high quality.

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