Abstract
In this work, investigations of Li and Sb for growth behavior of alkali niobate synthesized by hydrothermal method were conducted. The results of XRD and Raman analysis show excessive dopants in A sites (Li) are helpful for the formation of NaNbO3. The microstructure of alkali niobate superfine particles (SPs) is carefully studied through transmission electron microscopy (TEM) as well as scanning electron microscopy (SEM), and rod-like KNN SPs with preferred growth in [010] direction are clearly investigated due to the modification of Sb in B sites while NaNbO3 presents layer and spiral growth. Growth behavior and associated morphology of alkali niobate are well explained by the model of periodic bond chain (PBC). Besides, ferroelectric properties of as-sintered ceramics are enhanced, and ferroelectric-ferroelectric phase transition temperature (TR-O and TO-T) changes obviously, which provides a possibility to construct polymorphic phase boundary to improve properties of KNN materials.
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