Strongly enhanced polarization and dielectric breakdown strength of PZT95/5 by doping of Ce~(4+) and Nb~(5+)

摘要

In this report, we investigate ferroic properties of Nb~(5+) and Ce~(4+) co-doped bZr_(0.95)Ti_(0.05)O_3 (PZT95/5) ceramics, prepared via conventional solid state reaction route. Room temperature X-ray diffraction pattern suggests that synthesized samples crystallize with rhombohedral crystal symmetry (space group-R3c), equivalent to Zr rich PZT materials. Dielectric constant (ε_r) exhibits anomaly in the vicinity of transition temperature. To unveil, the effect of co-doping on nature of evolved phase, we follow diffusion coefficient, γ, obtained from modified Curie-Wiess law. Value of γ is found to be～1.24 and～ 1.20 for 2% and 3% Ce~(4+) doped material, respectively, and γ ＞ 1 for diffused type ferroelectric (FE) systems. Saturated P-E loop profile evidences that co-doping of Nb~(5+) and Ce~(4+) causes strong enhancement in technologically appealing ferroic properties, e.g., spontaneous polarization, remnant polarization and breakdown strength. Such advances in ferroic properties are highly appreciated in field of various ferroelectric-based technology.