EFFECT OF Er DOPING ON STRUCTURAL AND DIELECTRIC PROPERTIES OF SOL-GEL PREPARED PZT CERAM1CS

摘要

The polycrystalline complex compounds of (PbzEr_1-2)(Zr_0.6Ti_0.40)1-z/4O_3 (z = 0.07, 0.08, 0.l0) (PEZT) were synthesized using the metal-alkoxide sol-gel technique. Powder X-ray diffraction (XRD) studies of these com- pounds suggest that they can be formed in single-phase perovskite structure by a one-step process at a relatively low temperature. Scanning electron micros- copy (SEM) analysis shows that the grains are nearly spherical and distributed uniformly in the compounds. Detailed studies of dielectric properties (∈, tanδ, and σ) of the compounds as a function of temperature show a broadening of the permittivity peak and a change in transition temperature with the increase of Er~3+ concentration. Analysis of the diffusivity (γ) of the peaks in these compounds provides a value between l and 2. The higher value of γ indicates the greater disordering of the system. The hysteresis loop study confirms the phase transition of the system is of second order.