To produce high-performance piezoelectric solid solutions based on NaN
bO3, LiNbO3, and KNbO3, we chose, relying on the earlier developed cri
teria, second, third, and fourth components with various structures. T
he composition regions of NaNbO3- and KNbO3-based solid solutions were
estimated a priori. The electrical properties of the solid solutions
can be correlated with bond lengths.