Hybrid Bioceramic: A Synergistic Platform for Structural Reinforcement and Bioelectric Stimulation Toward Smart Medical Devices

As the rise of smart implants has led to a transformation in healthcare, the hybrid biomaterials have garnered significant attention due to the increasing demand for mechanical stability and functional properties. This study presents a barium titanate (BTO)-yttria stabilized zirconia (YSZ) bioceramic with varying compositions (between 40 wt.% and 60 wt.%), and sintering temperatures (1250°C-1450°C) to achieve clinically feasible structural integrity, piezoelectricity, mechanical strength, and a cell-friendly environment. By combining a piezoelectric phase with a mechanically robust ceramic phase, the hybrid system enables energy harvesting from physiological movements while maintaining long-term mechanical durability. The results demonstrate that both BTO and YSZ exhibit stable coexistence within a single material, segregated in a manner that preserves their respective structural and functional properties. Increasing BTO content enhances the piezoelectric coefficient (d₃₃), while YSZ contributes to higher hardness and fracture toughness. Optimal sintering at 1350°C yields a dense microstructure that strikes a balance between electrical and mechanical performance. Furthermore, microstructural analysis via Raman spectroscopy, scanning electron microscopy, and X-ray diffraction confirms phase stability and controlled grain growth. The findings suggest that the BTO-YSZ bioceramic has strong potential for co-design of biofunctional and mechanically robust hybrid biomaterials, paving the way toward next-generation smart biomedical implants.