K2 Nb2 O14 Si4
Crosnier M, Guyomard D, Verbaere A, Piffard Y, Tournoux M
Journal of Solid State Chemistry 98 (1992) 128-132
The potassium niobyl cyclotetrasilicate K2(NbO)2Si4O12
_cod_database_code 1000339
_database_code_amcsd 0013735
8.7404 8.7404 8.136 90 90 90 P4bm
atom     x     y     z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Nb1      0     0 .2160  .0071  .0071  .0079      0      0      0
Nb2      0     0 .7194  .0064  .0064  .0079      0      0      0
K1   .3226 .8226 .9919  .0180  .0180  .0124 -.0034  .0005  .0005
Si1  .1242 .6242 .3015  .0076  .0076  .0039  .0007  .0004  .0004
Si2  .1240 .6240 .6938  .0071  .0071  .0036 -.0001 -.0003 -.0003
O1   .4251 .2882 .2330
O2   .4219 .2892 .7654
O3       0     0     0
O4       0     0 .5010
O5   .1200 .6200 .4968
O6      .5     0  .228
O7      .5     0 .7628