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_cr43_bo _database_code_amcsd 0013984 4.870 5.565 4.406 90 90 90 Cmmm atom x y z C1 0 .1420 .3260 C2 .25 0 .1704