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Journal Article
Review
Recent Developments in (K, Na)NbO 3 -Based Lead-Free Piezoceramics.
Micromachines 2024 Februrary 27
(K0.5 Na0.5 )NbO3 (KNN)-based ceramics have been extensively investigated as replacements for Pb(Zr, Ti)O3 -based ceramics. KNN-based ceramics exhibit an orthorhombic structure at room temperature and a rhombohedral-orthorhombic (R-O) phase transition temperature ( TR-O ), orthorhombic-tetragonal (O-T) phase transition temperature ( TO-T ), and Curie temperature of -110, 190, and 420 °C, respectively. Forming KNN-based ceramics with a multistructure that can assist in domain rotation is one technique for enhancing their piezoelectric properties. This review investigates and introduces KNN-based ceramics with various multistructures. A reactive-templated grain growth method that aligns the grains of piezoceramics in a specific orientation is another approach for improving the piezoelectric properties of KNN-modified ceramics. The piezoelectric properties of the [001]-textured KNN-based ceramics are improved because their microstructures are similar to those of the [001]-oriented single crystals. The improvement in the piezoelectric properties after [001] texturing is largely influenced by the crystal structure of the textured ceramics. In this review, [001]-textured KNN-based ceramics with different crystal structures are investigated and systematically summarized.
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