Abstract
Samples of Al-doped (1–x)K0.5Na0.5Nb0.965Sb0.035O3–x(Bi0.82Al0.18)0.5Na0.5ZrO3 [((1–x)KNNS–xBANZ)] (x = 0.02, 0.03, 0.04, and 0.05) have been prepared by a conventional solid-state method. The results of XRD analysis suggest that the ceramics underwent a typical phase transition from orthorhombic (O) to tetragonal (T) as x was increased. According to the Raman shifts of key vibrational modes, lattice deformation and associated phase transition have been qualitatively deduced. Moreover, the ceramic with x = 0.05 exhibits enhanced piezoelectric properties compared with K0.5Na0.5NbO3 due to an O-T phase boundary (d33 ≈ 258 pC/N and kp ≈ 0.40). More importantly, the mechanism through which small ions function in a KNN lattice, as well as the phase transition, is addressed herein.
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