Infected bone defects are a growing global health issue, with risks including bone destruction, disability, and even death. The main clinical challenge is the difficulty in simultaneously achieving effective antibacterial action and promoting bone regeneration. Calcination at 800°C induces a phase transition from cubic (C-BSTO) to polarized tetragonal (T-BSTO), imparting piezoelectric properties. Subsequent treatment with sodium borohydride generates oxygen vacancies, enhancing polarization and piezoelectric performance. The synthesized T-BSTO-V