Hu, JiangtaoYang, PeidongLieber, Charles M.2019-09-271998Hu, Jiangtao, Peidong Yang, and Charles M. Lieber. 1998. “Nitrogen-drivensp3tosp2transformation in Carbon Nitride Materials.” Physical Review B 57 (6): R3185–88. https://doi.org/10.1103/physrevb.57.r3185.1098-01211550-235Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41417430The coordination of carbon as a function of nitrogen concentration in energetically deposited carbon nitride films has been systematically studied. A structural transformation from primarily sp(3)-bonded to sp(2)-bonded carbon and a density decrease from 3.3 to 2.1 g/cm(3) were observed as the nitrogen concentration increases from 11 to 17 %. Calculations on nitrogen-substituted carbon clusters indicate that there is a preference to form sp(2)-bonded carbon when the nitrogen concentration is larger than 12%. The implications for these results to the synthesis of superhard carbon nitride materials are discussed.en-USJournal Article2019-09-2710.1103/PhysRevB.57.R3185