Abstract
Rare-earth and Mn co-substituted KNN-based lead-free piezoelectric ceramics and (1−x)(K0.48Na0.52)NbO3–xYbMnO3 (KNN–xYM) were prepared by a conventional solid-state sintering method. The effects of YM addition on the structure, dielectric, and piezoelectric properties of KNN–xYM ceramics were systematically investigated. With increase of YM content, from the rhombohedral to orthorhombic transition temperature (TR–O) moves close to room temperature against the direction of the orthorhombic to tetragonal transition temperature (TO–T). A polymorphic phase transitions (PPT) between rhombohedral and orthorhombic phases exists at x∼0.01 and the optimum electrical characterization (d33∼140pC/N, kp∼0.42, Qm∼214, εr∼634, tanδ∼0.02, and Tc∼386°C) is also given to the compositions (x=0.01) around PPT. In addition, KNN–xYM ceramics became a relaxor ferroelectric gradually with increasing YM content. These results indicate that the enhanced piezoelectric properties can be achieved based on the coexistence of rhombohedral and orthorhombic phases.
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