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Lead-free piezoelectric ceramics Sr1.85Ca0.15Na1−xKxNb5O15 (0.00≤x≤0.40) were prepared using the conventional solid state reaction method. The structural, dielectric and piezoelectric properties were systematically studied. All the ceramics are single orthorhombic tungsten bronze phase at room temperature, and the lattice constants increase with K+ content. The dielectric spectra of each composition...
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