Nanoscale Effects on Structural and Giant Dielectric of PZT Synthesized by High Energy Ball Mill

Abstract

We report the formation of nanostructure Pb(Zr_0.53Ti_0.47)O₃ (PZT) ceramic powder having cubic crystal structure under ambient conditions that has been found to be stable up to 800°C. The cubic structure of nanocrystalline PZT under normal condition is attributed to the crystallite size effect. The crystallite size effect has also reflected its crucial role in substantial enhancement of the dielectric permittvity at T_c that may be termed as a novel “giant dielectric permittivity” (GDP) effect. The origin of such a high permittivity (ϵ∼34600 at 10 kHz), not reported so far, has been traced to the changes occurring in the material microstructure, interface and grain boundary effects predominantly controlled by the crystallite size.

Keywords:

• Nanocrystalline
• phase transition
• mechanical alloying
• dielectric constant
• ferroelectric