Cu2P2O7 Effenberger H Acta Crystallographica C46 (1990) 691-692 Structural refinement of low-temperature copper(II) pyrophosphate _database_code_amcsd 0010124 6.895 8.113 9.164 90 109.62 90 C2/c atom x y z Uiso Cu -.01814 .31288 .50706 .0103 P .19754 .00750 .20566 .0075 O1 0 .0466 .25 .0260 O2 .3757 .0002 .3614 .0093 O3c .2208 .1559 .1128 .0112 O3t .1785 -.1508 .1179 .0162