Processing Optimization and Toxicological Evaluation of "Lead-Free" Piezoceramics: A KNN-Based Case Study

Area of Science:

• Materials Science
• Ceramic Engineering
• Nanotechnology

Background:

• Growing demand for lead-free piezoelectric materials due to environmental regulations.
• Limitations of traditional lead-based piezoceramics necessitate novel, non-toxic alternatives.
• Sodium potassium niobate (KNN) is a promising lead-free piezoelectric candidate.

Purpose of the Study:

• To synthesize and characterize a novel lead-free KNN-based piezoceramic modified with MgNb2O6 (MN).
• To evaluate the effect of mechanochemical processing on microstructure and piezoelectric properties.
• To assess the toxicological profile of the developed lead-free ceramic.

Main Methods:

• Synthesis via mechanochemical activation combined with air sintering.
• Microstructural analysis using X-ray diffraction (XRD).
• Evaluation of piezoelectric properties and toxicological potential using in vitro assays on human and environmental cell models.

Main Results:

• Optimized mechanochemical processing led to refined microstructure and enhanced piezoelectric response.
• The developed KNN-MN system exhibited superior properties compared to other KNN-based materials.
• In vitro assays confirmed the absence of cytotoxicity for the studied KNN-based systems.

Conclusions:

• The developed lead-free KNN-MN ceramic offers a viable alternative to lead-based materials.
• Mechanochemical activation is an effective method for optimizing piezoelectric properties.
• The material demonstrates a favorable toxicological profile, suitable for diverse applications.