Enhancement in the piezoelectric properties in lead-free BZT- x BCT dense ceramics
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Enhancement in the piezoelectric properties in leadfree BZT-xBCT dense ceramics Rajat Syal1, Manoj Kumar1, Arun Kumar Singh2, Arnab De3, O. P. Thakur4,*, and Sanjeev Kumar1,* 1
Department of Applied Sciences, Punjab Engineering College (Deemed to be University), Chandigarh 160012, India Department of Electronics and Communications Engineering, Punjab Engineering College (Deemed to be University), Chandigarh 160012, India 3 Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India 4 Solid State Physics Laboratory, Timarpur, Delhi 110054, India 2
Received: 3 August 2020
ABSTRACT
Accepted: 13 October 2020
In this paper, we have prepared the lead-free piezoelectric BZT-xBCT (x = 0.48, 0.49, 0.50 and 0.51) polycrystalline compositions using solid-state reaction technique. Structural, microstructural and electrical properties were explored by changing the BCT concentration. Structural analysis shows the existence of morphotropic phase boundary in BZT-xBCT (x = 0.50) sample. The SEM micrographs illustrate the decrease in grain size with increase in the BCT concentration. The temperature-dependent dielectric behavior depicts high dielectric constant * 26,100 and low loss * 0.04 for BZT-0.48BCT composition at Curie temperature. The PE hysteresis loop shows the well-saturated hysteresis loops and low value of coercive field (EC). The higher values of electromechanical planar coupling coefficient, KP * 51.2%, piezoelectric coefficient, d33 * 512 pC/N and bipolar strain (* 0.16%) were recorded for BZT-0.50BCT ceramic composition.
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Springer Science+Business
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1 Introduction For the past five decades, lead-based materials have been broadly considered by the researchers for their exceptional dielectric, ferroelectric, and piezoelectric properties [1, 2]. Lead zirconium titanate (PZT)-based materials are the outstanding ceramics that attract the researchers as well as the industrialists for its various applications such as high-end piezoelectric sensors, transducers, actuators, electronic devices, and
piezoelectric transformers [3–7]. Instead of their dominance among all the ceramics, it causes health and environmental pollution due to Pb toxicity [8]. So, in recent years, researchers paid serious consideration toward the Pb-free materials having superior properties such as dielectric, piezoelectric, and ferroelectric comparable to Pb-based materials. Therefore, BaTiO3 and BaTiO3-doped ceramics have been investigated among all the Pb-free ceramics with phenomenal ferroelectric, dielectric and piezoelectric
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https://doi.org/10.1007/s10854-020-04678-9
J Mater Sci: Mater Electron
response [9–12]. Exceptionally, Liu and Ren studied the ion altered BaTiO3 solid solution, i.e., Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 (BZT-BCT) having a extraordinary piezoelectric response (d33 * 620 pC/ N at x = 50) at their morphotropic phase boundary (MPB) region [13]. Since, then BZT-BCT
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