Abstract
Aluminum nitride was prepared by arc discharge between aluminum electrodes in nitrogen atmosphere. The apparatus which had been shown by Long and Foster was improved in cooling way of eletrode to decrease oxygen content of the product. Fast neutron activation analysis revealed that the product contained oxygen as little as O.82% and the other impurities less than O. O1%. The oxygen content was decreased by heating the product in nitrogen atmosphere. When it was heated at 1800 C for 2.5 hours, the oxygen content was decreased as low as 1/5 of the initial value.X-ray powder diffraction of the product gave sharp diffraction lines of aluminum nitride and its lattice constants were a=3.111, c=4.980. The spectra of arc flame showed neither the band system which indicated the presence of AIN molecule nor any unidentified spectrum in visible and ultra-violet region. The influence of nitrogen pressure in the range between 1atm and 10atm on the production rate of aluminum nitride was studied. The production rate increased as the nitrogen pressure inereased from 1atm to 3atm, but above 8atm it decreased as the pressure increased. From the thermal decomposition rate of aluminum nitride in nitrogen atmosphere, the apparent activation energy was calculated to be 127 kcal/mol.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
