Articles
  • Dielectric and ferroelectric characteristics of doped BZT-BCT ceramics sintered at low temperature
  • Dang Anh Tuana,*, Le Dai Vuongb, Vo Thanh Tungc, Ngo Ngoc Tuanc,d and Nguyen Trung Duongc,e
  • aHa Nam Science and Technology Department, Vietnam bHue Industrial College, Hue City, Vietnam cUniversity of Sciences, Hue University, Vietnam dNaval Technical Institute, Vietnam eHue University - Quang Tri Campus, Vietnam
Abstract
The paper presents relaxor properties of lead-free nanostructured ZnO doped BZT-BCT ceramics sintered at low temperature. Curie-Weiss, Quadratic, Vogel-Fulcher laws were applied to study dielectric properties. The fitting experimental data to the mentioned laws showed the typical diffuseness characteristic of the materials as a result of the substitution of Zn2+ ions into BZT-BCT substrate. Also, received ferroelectric loops were well saturated and fairly slim for all samples that assert again diffuse ferroelectric nature in the investigated ceramics. The characterized values of remnant polarization, Pr, and coercive field, Ec, depended on ZnO nanoparticles concentration. According to that, when varying doping content in the region of 0.00-0.25%wt, Pr improved and reached a maximum value of 6.19 μC/cm2 at 0.15%wt, then decreased monotonously. Meanwhile Ec continuously intensified in the range of 1.36-2.72 kV/cm. In other words, nanosized ZnO particles made the ceramics harder

Keywords: BZT-BCT, Ferroelectric, ZnO nanoparticles, sintering

This Article

  • 2018; 19(1): 32-36

    Published on Feb 28, 2018

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