K6Ta6Si4O26
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 0014245
9.066 9.066 7.873 90 90 120 P-62m
atom    x    y    z Biso
K1   .586    0   .5  .27
K2    .61    0    0  2.8
Ta   .239    0 .249  .90
Si    1/3  2/3 .208 1.25
O1    1/3  2/3    0  .60
O2   .262    0    0  .83
O3   .811    0 .260  .52
O4   .500 .176 .289  .88
O5   .242    0   .5  .73