Temperature-Stable High-Power Properties of (K, Na)NbO3-Based Piezoelectric Ceramics

Piezoelectric ceramics tailored for high-power resonance applications are investigated, utilizing a composite structure comprising the ferroelectric phase (K, Na)NbO3 as a matrix integrated with the alkali titanoniobate dielectric phase KTiNbO5. Achieving a mechanical quality factor of 750, comparable to lead-based counterparts, highlights their suitability for demanding applications. Crucially, these ceramics exhibit exceptional temperature stability of electromechanical properties, a critical attribute for real-world applications subject to temperature variations. Characterization employs the small signal resonance method and high-power resonance measurements. Notably, within the 25 °C–200 °C range, minimal decay of the mechanical quality factor is observed, affirming robust temperature stability under high-power conditions.