Abstract
(K0.5Na0.5)NbO3–0.06LiTaO3–xSrZrO3 (KNN–LT–xST) lead-free piezoelectric ceramics with rhombohedral–tetragonal (R–T) phase boundary have been designed and prepared by the conventional solid-state reaction method, the phase transitional behavior and composition-dependent piezoelectric properties of KNN–LT–xST lead-free system were investigated. The R–T phase boundary is identified in the KNN–LT–xST ceramics with a composition of 0.04 ≤ x ≤ 0.06. The ceramics in the vicinity of the R–T phase coexistence zone exhibit a strong compositional dependence and significantly enhanced piezoelectric properties. A comprehensive performance of d33 (222–254 pC/N) and Tc (282–312 °C) could be obtained in the KNN–LT–xSZ ceramics with 0.04 ≤ x ≤ 0.06 by tailoring the SrZrO3 content. The ceramic with x = 0.045 shows the optimum electrical properties: d33 = 254 pC/N, kp = 28%, εr = 758, tanδ = 1.7%, Pr = 8.98 μC/cm2 and Tc = 300 °C. The existence of an R–T phase boundary and therefore the involvement of the more polarization states should be responsible for the enhanced piezoelectric properties of the KNN–LT–xSZ ceramics. The good piezoelectric properties together with a high cubic–tetragonal phase transition temperatures (Tc) make the KNN–LT–xSZ ceramics showing the promising lead-free piezoelectric material system for the practical applications.
Published Version
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