Аннотация:The interaction of Nb2O5 with NaF solutions at 600-800 o C, and a pressure of 200 MPa, in a reducing environment (Ni-Nio, Co-CoO) leads to the formation of Na-Nb oxifluorides.It has been established that an increase in H2 fugasity stabilizes the perovskite structure, while a decrease in total pressure promotes the formation of the pyrochlore Fd3m structure.