Abstract
(K, Na)NbO3 (KNN) lead-free piezoelectric crystals with different K/Na molar ratios were synthesized through a hydrothermal method using isopropanol/deionized water as the reaction medium. It is shown that cube-like KNN crystals were synthesized at a relatively low [OH–] concentration. The structure of the as-synthesized KNN crystals transfers from a NaNbO3-type orthorhombic phase to a KNbO3-type tetragonal phase with the increase of the K/Na ratio. This principle is also instructive in a finer range of K/Na ratio (0.71:0.29–0.73:0.27), indicating a facile synthesis route and recommended conditions for the synthesis of KNN materials with a morphotropic phase boundary (MPB) between NaNbO3 and KNbO3.
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