K6Nb6Si4O26
Choisnet J, Nguyen N, Groult D, Raveau B
Materials Research Bulletin 11 (1976) 887-894
De nouveaux oxydes a reseau forme d'octahedres NbO6 (TaO6) et de groupes Si2O7:
Les phases A3Ta6Si4O26 (A = Ba,Sr) et K6M6Si4O26 (M = Nb,Ta)
_database_code_amcsd 0014246
9.032 9.032 8.041 90 90 120 P-62m
atom    x    y    z Biso
K1   .591    0   .5 2.79
K2   .604    0    0  .73
Nb   .239    0 .234  .80
Si    1/3  2/3 .203 1.25
O1    1/3  2/3    0  .60
O2    .25    0    0  .10
O3   .816    0 .237  1.3
O4   .494 .176 .265  .10
O5   .268    0   .5 1.29