Large piezoelectric strain observed in sol-gel derived BZT-BCT ceramics

Praveen, J P and Kumar, K and James, A R and Karthik, T and Asthana, Saket and Das, D (2014) Large piezoelectric strain observed in sol-gel derived BZT-BCT ceramics. Current Applied Physics, 14 (3). pp. 396-402. ISSN 1567-1739

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High performance lead (Pb)-free piezoelectric ceramics with excellent piezoelectric properties is in great demand for sensor and actuator applications. Barium zirconate titanate-barium calcium titanate [xBZT-(1 - x)BCT] (x = 0.5) is one such lead free system, which exhibits high piezoelectric properties similar to lead zirconate titanate (PZT). In this study we report the synthesis and characterization of this lead free [xBZT-(1 - x)BCT] (x = 0.5) via wet chemical sol-gel method. Calcination of the BZT-BCT precursor only at 1000 C (against 1300 C reported in the literature) for 4 h resulted in formation of single phase nanoparticles (<50 nm) as confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies. Highly dense and homogenous microstructure with 95% of the theoretical density was obtained by solid-state sintering of the green pellets at 1550 C. Remanent polarization (Pr) of 11.55 μC/cm2 and relative permittivity of 20,020 at the Curie temperature of 95 C were obtained. Electrically poled BZT-BCT ceramics samples exhibited high piezoelectric charge coefficients, d33 ∼ 530 pC/N, d33* ∼ 942 pm/V, large electromechanical coupling coefficient kp ∼ 0.45 and a large strain of 0.15%, which are comparable to those of lead based piezoelectric ceramics. The excellent piezoelectric properties of this sol-gel derived BZT-BCT system has been analyzed and correlated to its structure in this report.

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IITH Creators:
IITH CreatorsORCiD
Asthana, Saket
Item Type: Article
Uncontrolled Keywords: Dielectric; Ferroelectric; Lead-free; Piezoelectric
Subjects: Physics
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 28 Nov 2014 08:55
Last Modified: 29 Aug 2017 09:50
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