Ba2 Ca2 Cu3 Hg O8.16 Armstrong A, David W, Gameson I, Edwards P, Capponi J, Bordet P, Marezio M Physical Review B52 (1995) 15551-15557 Pressure-induced structural changes in superconducting Hg Ba2 Ca(n-1)Cu(n) O(2n+2+d) (n=1,2,3) compounds _cod_database_code 1008865 _database_code_amcsd 0016733 3.7608 3.7608 15.018 90 90 90 P4/mmm atom x y z occ Hg1 0 0 0 Ba1 .5 .5 .1651 Ca1 .5 .5 .3931 Cu1 0 0 .5 Cu2 0 0 .2934 O1 0 .5 .5 O2 .5 0 .3003 O3 0 0 .1309 O4 .5 .5 0 .16