Domain wall freezing behavior in near triple point Pb free BZT-BCT ceramic composition

Lead free piezoceramics BZT-BCT [(1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.7Ca0.3)TiO3] have been studied extensively for last decade, as it has exceptionally large piezoelectric response (d33 = 560-620 pC/N) till date [1]. These ceramics have been reported to exhibit high dielectric constant and low dielectric l...

Full description

Saved in:
Bibliographic Details
Main Authors: Dey, Koushik, Ahad, Abdul, Gautam, Kamini, Shukla, D. K.
Format: Conference Proceeding
Language:English
Subjects:
Composition
Dielectric loss
Dielectric relaxation
Domain walls
Freezing
Lead free
Permittivity
Phase diagrams
Piezoelectric ceramics
Piezoelectricity
Temperature
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Lead free piezoceramics BZT-BCT [(1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.7Ca0.3)TiO3] have been studied extensively for last decade, as it has exceptionally large piezoelectric response (d33 = 560-620 pC/N) till date [1]. These ceramics have been reported to exhibit high dielectric constant and low dielectric loss. In this paper, we present dielectric spectroscopy on a composition (Ba0.91Ca0.09Ti0.86Zr0.14O3, BZT-30BCT) which is nearby triple point in the temperature-composition phase diagram of pseudo binary BZT-BCT ceramics. An exceptionally large value of dielectric constant (~18000) with comparatively low loss is observed across para to ferro transition above room temperature (~338 K). Around this transition frequency dispersion of ε′(T) & ε′′(T) is negligible. But low temperature measurements divulges a broad dielectric relaxation related to domain wall freezing and is analyzed utilizing Vogel-Fulcher model. Freezing temperature of domain walls are estimated ~130K.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5112851