Na4 Nb8 O32 P4 Costentin G, Borel M, Grandin A, Leclaire A, Raveau B Materials Research Bulletin 26 (1991) 1051-1057 Phosphate niobium bronzes and bronzoids with the MPTBP structure: Na4Nb8P4O32 and Na4-xAxNb7MP4O32 fourth members of the series Ax(PO2)4(NbO3)2m _cod_database_code 1001699 _database_code_amcsd 0014362 6.635 5.352 17.967 90 90.33 90 P2_1 atom x y z Nb1 -.0069 .25 .12515 Nb2 .3396 .25 .96040 Nb3 .1596 .251 .46032 Nb4 .5065 .247 .62490 P1 .6901 .262 .8133 P2 .8091 .252 .3140 Na1 .203 .243 .7826 Na2 .297 .254 .2831 O1 .789 .469 .0997 O2 .881 .279 .2329 O3 .862 -.036 .0975 O4 .226 .022 .1756 O5 .159 .291 .0393 O6 .142 .562 .1777 O7 .508 .296 .8634 O8 .542 .045 -.0001 O9 .340 .313 .5401 O10 -.007 .300 .3632 O11 .363 .029 .4041 O12 -.048 .458 .4984 O13 .292 .523 .3985 O14 .615 .281 .7324 O15 .271 .025 .6719 O16 .357 .563 .6801