Abstract
Alkaline niobates ANbO3 (A = K, Li and Na) display multiple phases coexisting, i.e., perovskite (Pe), LiNbO3, completely filled tetragonal tungsten-bronze (cf-TTB) structures. The composite ceramics of K0.5Na0.5NbO3 (KNN) and Na0.2K2.8Li2Nb5O15 (NKLN) were explored as a candidate for the lead-free dielectric and piezoelectric composite ceramics with only the Pe and the cf-TTB structure coexisting. The Pe and the cf-TTB structure showed the ferroelectric distortions along the c-axis with pseudo-tetragonal symmetry. The (1-x)KNN-(x/5)NKLN (x = 0–0.1) composite ceramics displayed the ferroelectric hysteresis at room temperature. We studied the two phases mixing mechanism by comparing the structural and ferroelectric properties.
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