Citation: Arakcheeva, A.V.; Shamrai, V.F.; Grinevich, V.V.; Meyer, M.; Chapuis, G. (1999). K Nb4 O5 F and Nb O2 crystal structures. Structural aspect of chemical decomposition of K2-x Nb4 O3 (O, F)3 F in the melt of sodium and potassium chlorides. Kristallografiya, 44, pp. 6-11.