DIELECTRIC AND PHASE TRANSITION PROPERTIES OF GD DOPED PbZr_0.53Ti_0.47O₃

ABSTRACT

PbZr_0.53Ti_0.47O₃ (PZT53/47) doped with 0.6% wt. Gd₂O₃ was synthesized following the solid state reaction technique. X-ray diffraction indicated a rhombohedral structure. The grain size distribution was centered at 3 μ m with grains as big as 6 μ m. Dielectric studies in the 100 Hz to 1 MHz and the 25 to 450°C frequency and temperature ranges, yielded values above 40,000 for the relative permittivity. The transition temperature decreased from 386°C for the undoped ceramic to 352°C. Hysteresis loops were taken at 23°C and applied electric fields up to 17 kV/cm. The radial electromechanical coupling-factor was 0.12.

Keywords:

• Ferroelectric
• dielectric properties
• phase transition
• Gd doped
• PZT

ACKNOWLEDGMENTS

This work was partially supported by DGAPA-UNAM Proj. Nos. IN102908, IN114207 and IN109608, and CoNaCyT Proj. No. 82503 and 49986-F. Thanks are due to V. García, I. Gradilla, P. Casillas, E. Aparicio and J. Fuentes for their technical assistance.