Effect of grain size on dielectric and ferroelectric properties of nanostructured Ba0.8Sr0.2TiO3 ceramics

Venkata Ramana Mudinepalli, Leng Feng, Wen Chin Lin, B. S. Murty

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Barium strontium titanate (Ba0.8Sr0.2TiO3, BST) nanocrystalline ceramics have been synthesized by high energy ball milling. As the sintering temperature increases from 1200 °C to 1350 °C, the average grain size of BST ceramics increases from 86 nm to 123 nm. The X-ray diffraction (XRD) studies show that these ceramics are tetragonal. The phase and grain size of the sintered pellets have been estimated from the XRD patterns, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images. The effect of grain size on dielectric and ferroelectric properties is studied. The dielectric and piezoelectric parameters are greatly improved at room temperature with increase in grain size. The Curie transition temperature is found to shift slightly towards higher temperatures as the grain increases from 86 nm to 123 nm. The coercive field decreases and the remnant polarization and spontaneous polarization increase as the grain size of BST nano ceramics increases. These ceramics are promising materials for tunable capacitor device applications.

Original languageEnglish
Pages (from-to)46-53
Number of pages8
JournalJournal of Advanced Ceramics
Volume4
Issue number1
DOIs
Publication statusPublished - 2015 Mar 1

    Fingerprint

Keywords

  • crystallization
  • dielectric properties
  • electron microscopy
  • hysteresis
  • lead free ceramics
  • nanocrystalline ceramics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites

Cite this