Lead-Free KNN-Based Textured Piezoelectric Ceramic

Product Name Lead-Free KNN-Based Textured Piezoelectric Ceramic Product Overview Lead-Free KNN-Based Textured Piezoelectric Ceramic is a dense lead-free piezoelectric ceramic with grain orientation (typically (001) or (010)-oriented) based on the (K, Na)NbO₃ perovskite system, fabricated using platelike NaNbO₃ as templates via the Reactive Templated Grain Growth (RTGG) or Templated Grain Growth (TGG) texturing process. Developed by Prof. Yang Zhen's research group, this ceramic achieves a piezoelectric constant d₃₃ exceeding 500 pC/N — a major breakthrough in lead-free piezoelectric materials, matching or exceeding the performance of certain lead-based PZT ceramics. The material is completely free of lead and other heavy metals, making it environmentally friendly and suitable as the core piezoelectric element for high-performance devices such as medical ultrasound transducers and high-sensitivity sensors. Technical Parameter Diameter:≤ 12 mm Product Features 1. Ultra-High Piezoelectric Constant: d₃₃ > 500 pC/N, significantly outperforming ordinary randomly-oriented KNN ceramics (typically d₃₃ 100–200 pC/N), and comparable to or exceeding commercial PZT-5H. 2. High Curie Temperature: Tc > 250 °C, well above PZT-5H (~ 193 °C), enabling stable operation at higher temperatures — ideal for high-temperature / high-power environments. 3. High Electromechanical Coupling: kₚ > 0.60 means higher mechanical displacement output at the same driving voltage, and vice versa for higher energy conversion efficiency. 4. Strong Grain Orientation: Achieved via RTGG with Lotgering factor ≥ 0.85 along (001), which is the core mechanism behind performance breakthroughs. 5. Completely Lead-Free & Eco-Friendly: Free of Pb, Cd, Cr⁶⁺, and other toxic substances; complies with RoHS, REACH, and biocompatibility requirements. 6. High Densification: Relative density ≥ 96%, free of visible pores, high breakdown strength, and stable long-term performance. 7. Flexible Customization: Diameter ≤ 12 mm and thickness ≤ 1 mm customizable; electrode processing services available. Application Fields • Medical Ultrasound Transducers: High d₃₃ and kₚ deliver high sensitivity and broadband imaging for B-mode ultrasound, color Doppler, and ultrasound endoscopes. • Non-Destructive Testing (NDT) Probes: Enhanced defect detection capability for aerospace, rail transit, and pressure vessel inspection. • High-Performance Piezoelectric Actuators: High kₚ and d₃₃ yield higher displacement output for precision positioning stages, piezoelectric inkjet printheads, and adaptive optical deformable mirrors. • High-Sensitivity Sensors: Accelerometers, pressure sensors, and flow sensors with large charge output and low signal-to-noise ratio. • Energy Harvesters: Convert ambient vibrations into electrical energy to power wireless sensor nodes and wearable devices. • High-Frequency SAW/BAW Devices: The high grain orientation makes this ceramic suitable for surface acoustic wave / bulk acoustic wave filters, improving frequency selectivity and temperature stability. • Biomedical / Wearable Devices: Biocompatible and lead-free, suitable as piezoelectric materials for implantable devices and wearable sensors. • Research Reference Materials: For universities and research institutes studying lead-free piezoelectrics, texture growth mechanisms, and structure–property relationships.