Structure and Electrical Properties of Fe₂O₃-Doped PZT-PZN-PMnN Ceramics

Abstract

The 0.8Pb(Zr 0.48 Ti 0.52 )O 3 – 0.125Pb(Zn 1/3 Nb 2/3 )O 3 – 0.075Pb(Mn 1/3 Nb 2/3 )O 3 + x wt% Fe 2 O 3 ceramics (PZT-PZN-PMnN), where x = 0 ÷ 0.35, has been prepared by two-stage calcination method. The effect of Fe 2 O 3 content on the crystal structure and electrical properties of ceramics has been investigated. The results of X-ray diffraction (XRD) show that all samples have pure perovskite phase with tetragonal structure, the c/a ratio increases with increasing Fe 2 O 3 content. At x = 0.25, electrical properties of ceramics are best: the density ( r ) of 7.86 g/cm 3 , the electromechanical coupling factor ( k p ) of 0.64, the dielectric constant ( ε r ) of 1400, the dielectric loss (tan d ) of 0.003, the mechanical quality factor ( Q m ) of 1450, the piezoelectric constant ( d 31 ) of 155 pC/N, and the remanent polarization ( P r ) of 37 μC/cm 2 , which makes it as a promising material for high power piezoelectric devices.