Diamond Fayos J Journal of Solid State Chemistry 148 (1999) 278-285 Possible 3D carbon structures as progressive intermediates in graphite to diamond phase transition Note: mathematical model, phase: diam_cr44_ch _database_code_amcsd 0013985 4.127 4.937 4.819 90 90 90 Pban atom x y z C1 .0257 .1387 .3376 C2 .3312 .1644 .1871