Portlandite Xu H, Zhao Y, Zhang J, Hickmott D D, Daemen L L Physics and Chemistry of Minerals 34 (2007) 223-232 In situ neutron diffraction study of deuterated portlandite Ca(OD)2 at high pressure and temperature Sample: P = 3.40 GPa _database_code_amcsd 0009076 3.5175 3.5175 4.6186 90 90 120 P-3m1 atom x y z occ Uiso Ca 0 0 0 .034 O 1/3 2/3 .243 .013 D .401 .802 .421 1/3 .067