Abstract
The lead-free (K0.48Na0.52)(Nb0.97Sb0.03)O3-0.05Srx(Bi0.5Na0.5)(1-x)ZrO3-0.15%Fe2O3 (KNNSb-SrxBNZ) ceramics were synthesized using a conventional solid-state method. The influences of Sr2+ content on the crystal structure, microstructure, ferro/di/piezoelectric properties, and temperature stability of the ceramics were systematically researched. All the KNNSb-SrxBNZ ceramics possess pure perovskite structure with rhombohedral, orthorhombic and tetragonal co-existing phases from x = 0 to x = 0.3. The surface morphological analysis further indicates that the appropriate amount of Sr2+ brought great contribution to grain growth. The optimal comprehensive electrical properties (d33 = 470 pC/N, kp = 0.55, TC = 251 °C) were simultaneously obtained in the sample with x = 0.1. In addition, the as-prepared ceramics exhibited excellent thermal stability in a wide temperature range (Ta = 250 °C, Δd33 ≥ 90%). Therefore, the KNNSb-SrxBNZ material system will be a promising candidate for the future applications.
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