Ferroelectric, piezoelectric and mechanical properties in lead free (0.5)Ba(Zr0.2Ti0.8)O3–(0.5)(Ba0.7Ca0.3)TiO3 electroceramics

A, Srinivas and R V, Krishnaiah and V L, Niranjani and Kamat, S V and Karthik, T and Asthana, Saket (2015) Ferroelectric, piezoelectric and mechanical properties in lead free (0.5)Ba(Zr0.2Ti0.8)O3–(0.5)(Ba0.7Ca0.3)TiO3 electroceramics. Ceramics International, 41 (2A). pp. 1980-1985. ISSN 0272-8842

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Barium zirconate titanate–barium calcium titanate [(0.5)BZT–(0.5)BCT], a solid solution ceramic, was synthesized by solid state route and its structure, microstructure, dielectric, ferroelectric, piezoelectric and mechanical properties were investigated. Unipolar and bipolar strain loops with minimal hysteresis were observed from strain measurements. The d33* values increased with increase in electric field, reached a maximum of 1257 pm/V at a field of 0.6 kV/mm, subsequently decreased to 530 pm/V at a field of 4.1 kV/mm and showed slim hysteresis. A high value of dielectric constant (εr~9700) was recorded with the variation of frequency at a temperature around 85 °C (Tc) indicating frequency independent transition. P vs. E and I vs. E hysteresis measurements confirmed the intrinsic ferroelectric character with Pr of ~9.1 µC/cm2 and EC of ~0.3 kV/mm. Polarization vs. electric field measurements at different electric fields showed slim and saturated hysteresis behaviour indicating a coarse grain structure. In the synthesized (0.5)BZT–(0.5)BCT, Vickers hardness, Young׳s modulus and fracture toughness were evaluated, and compared with those of lead based compounds and were found to be on par with them.

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IITH Creators:
IITH CreatorsORCiD
Asthana, Sakethttp://orcid.org/0000-0002-6420-3304
Item Type: Article
Uncontrolled Keywords: A. Powders: solid state reaction; C. Dielectric properties; C. Ferroelectric properties; E. Actuators
Subjects: Physics
Chemical Engineering > Ceramic and allied technologies
Divisions: Department of Physics
Depositing User: Team Library
Date Deposited: 30 Dec 2014 06:29
Last Modified: 29 Aug 2017 09:38
URI: http://raiith.iith.ac.in/id/eprint/1275
Publisher URL: https://doi.org/10.1016/j.ceramint.2014.08.127
OA policy: http://www.sherpa.ac.uk/romeo/issn/0272-8842/
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