ملخص: A new oxyfluoride K3(Nb3Ti2)O11F4 with a tetragonal tungsten bronze type structure has been prepared and characterized in the KNbO3---TiOF2 system. The room temperature space group (P4/mbm) has been determined on a single crystal. The unit cell parameters are a = 12.453 A and c = 3.972 A.L'etude du systeme KNbO3---TiOF2 a permis de mettre en evidence et de caracteriser un nouvel oxyfluorure de type ‘bronzes quadratiques de tungstene’: K3(Nb3Ti2)O11F4. Le groupe spatial a temperature ambiante (P4/mbm) a ete determine sur monocristal. Les parametres de la maille elementaire sont a = 12,453 A et c = 3,972 A.

لغة: فرنسية