Fifteen binary systems (1-x)NaNbO3 . xA(II)Nb(2)O(6) and (1-x)NaNbO3 .
xA(II)TiO(3) (A(II) = Ni, Cu, Mg, Co, Zn, Mn, Cd, Ca, Sr, Pb) were st
udied in detail. The second components examined have perovskite, colum
bite, ilmenite, or potassium tungsten bronze structures.