Articles
  • Relaxor and field-induced strain behavior in lead-free Bi0.5(Na0.82 K0.18)0.5TiO3 ceramics modified with BaZrO3
  • Tran Vu Diem Ngoca, Hyoung-Su Hana, Kyung-Jong Kima, Rizwan Ahmed Malika, Ali Hussainb and Jae-Shin Leea,*
  • a School of Materials Science and Engineering, University of Ulsan, Ulsan 680-749, Korea b School of Nano & Advanced Materials Engineering, Changwon National University, Changwon 641-773, Korea
Abstract
The crystal structure, microstructure, dielectric, ferroelectric and field-induced strain properties of lead-free (1-x)(Bi0.5 (Na0.82K0.18)0.5TiO3)-xBaZrO3 (x = 0-0.05) ceramics (BNKT-BZ) were investigated. X-ray diffraction analyses revealed that a phase transformation occurred at x = 0.02 from a coexistence of rhombohedral and tetragonal symmetry to another mixed state of pseudocubic and tetragonal symmetry.The temperature and frequency dependence of dielectric constant and loss showed strong frequency dispersive behaviors for all BZ-modified specimens. The polarization and strain hysteresis loops suggested that the addition of BZ signicantly disrupted the ferroelectric order accompanied by an enhancement in fieldinduced strain up to 0.26 % at x = 0.02.

Keywords: Lead-free ceramics, Strain, BNKT-BZ, Relaxor ferroelectric

This Article

  • 2012; 13(S2): 177-180

    Published on Nov 30, 2012