Investigation of thermal parameters of AlN nanoparticles at the different heating rates

Heat flux and mass change of AlN nanoparticles at the different heating rates were considered as a function of temperature. The Gibbs energy of the AlN nanoparticles system was determined in the temperature range of 300 divided by 1400K, at the heating rates as 5, 10, 15 and 20 K/min. Experiments in heating and cooling processes were carried out separately and the results were analyzed. The surface oxidation process under the influence of temperature is formed AlxNyOz compound, which is explained by phonon oscillations on the Raman spectrum. The hydroxide effect on crystallization and properties of the material is clear on the Raman spectrum. Simultaneously, on the surface of nanoparticles Al(OH)3 or AlOOH are formed as a result of the hydration, and phonon oscillations are observed. Moreover, as a result of the temperature effect, VN and VAl3- - 3 x O+N defect complexes can be formed in the sample. Space symmetry of AlN nanoparticles and preserving the crystalline structure at the nanoscale were investigated by the XRD method. The size and surface imaging of nanoparticles were studied using HRTEM analyses.

Automated summary

The heat flux and mass change of AlN nanoparticles were investigated as a function of temperature and heating rates. The Gibbs energy of the system was determined in the temperature range of 300 to 1400K, with heating rates of 5, 10, 15, and 20 K/min. The experimental results of heating and cooling processes were analyzed, and the formation of AlxNyOz compound due to surface oxidation under temperature influence was explained by phonon oscillations on the Raman spectrum. The effects of hydroxides on crystallization and properties of the material were observed on the Raman spectrum, along with the formation of Al(OH)3 or AlOOH on the surface of nanoparticles due to hydration.