H2 I3 K O9 Bordet P, Boucherle J, Santoro A, Marezio M Solid State Ionics 21 (1986) 243-254 Crystal structure and proton conductivity of N H4 H2 (I O3)3 and K H2 (I O3)3 _cod_database_code 1008360 _database_code_amcsd 0016271 8.266 8.200 8.180 66.08 60.16 71.06 P-1 atom x y z occ I1 .8141 .1865 .7547 I2 .2392 .7348 .7778 I3 .3036 .2006 .7819 O1 .7757 .4264 .6021 O2 .8351 .0821 .5803 O3 .1216 .5542 .8209 O4 .4721 .6589 .6122 O5 .4648 .2311 .8520 O6 .0601 .1841 .6600 O7 .4040 -.0211 .7513 O8 .2631 .6405 .0070 O9 .1180 .1359 .0323 K1 .7240 .7200 .7619 H1 .3608 .5260 .3668 H2 -.021 .477 .038 .5 H3 .035 -.019 .475 .5