Dielectric, ferroelectric, and piezoelectric properties of lead-free Ba_0.95Ca_0.05Ti_1-xZr_xO₃ ceramics

Abstract

Ba_0.95Ca_0.05Ti_1-xZr_xO₃ (BCTZO) ceramics were prepared by a solid state reaction method. The samples were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM) and X-ray absorption near edge structure (XANES). The ceramics exhibit a pure perovskite structure. The average grain size gradually decreases with increasing Zr concentration. XANES results indicate that the intensities of pre-edge peaks dropped with increasing Zr concentration. The BCTZO ceramic of x = 0.05 has the optimum electrical properties with the maximum dielectric constant (ε'_m), remanent polarization (2P_r), coercive electric field (2E_c) and piezoelectric charge constant (d₃₃) of 7,244, 12.54 (μC/cm²), 5.29 (kV/cm) and 288 (pC/N), respectively.

Keywords:

• Ba0.95Ca0.05Ti1-xZrxO3
• XANES
• ferroelectric
• piezoelectric

Acknowledgments

This work was supported by the Research and Development Institute, Udon Thani Rajabhat University, Udon Thani, Thailand. The authors would like to thanks the SUT-NANOTECH-SLRI joint research facility for synchrotron utilization, Thailand for XAS bemetime.