Phase analysis studies on the system PbOPbF2Nb2O5NbO2F

Samples in the system PbOPbF₂Nb₂O₅NbO₂F prepared at 875 K and 1025 K were studied by X-ray single crystal and powder diffraction as well as electron diffraction methods. Six new compounds were characterized as Pb_0.74Nb_10.62(O,F)₃₀ (orth.), Pb_1.36Nb_10.91(O,F)₃₀ (tetr.), Pb_0.27Nb(O,F.)_3.17 (hex.), Pb₂Nb₃O₇F₅ (tetr.), Pb_0.75NbO₃F_0.5 (tetr.) and Pb_1?$\text{x}$Nb_$\text{x}$(O,F)_2+$\text{y}$ (cub.)