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_ch _database_code_amcsd 0013983 4.964 5.163 4.387 90 90 90 Cmma atom x y z C1 0 .0855 .3443 C2 .25 0 .1699