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http://hdl.handle.net/10773/20726
Title: | Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 ceramic |
Author: | Coondoo, Indrani Panwar, Neeraj Amorin, Harvey Alguero, Miguel Kholkin, A. L. |
Keywords: | FREE PIEZOELECTRIC CERAMICS DIFFUSE PHASE-TRANSITION FERROELECTRIC CERAMICS FREE PIEZOCERAMICS TEMPERATURE RELAXOR PIEZORESPONSE POLARIZATION CONSTANTS TITANATE |
Issue Date: | 2013 |
Publisher: | AMER INST PHYSICS |
Abstract: | Polycrystalline sample of lead-free 0.5Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3 ceramic has been synthesized by solid state reaction method. Single-phase perovskite structure with rhombohedral symmetry was confirmed by x-ray diffraction. Temperature dependent dielectric permittivity studies demonstrated frequency independent behavior, indicating that the studied sample was not a typical relaxor ferroelectric. A polymorphic phase transition between rhombohedral and tetragonal phase was noticed near room temperature followed by a tetragonal to cubic transition with 97 degrees C as the temperature of maximum permittivity. The macroscopic values of d(33) and d(31) were similar to 350 pC/N and -141 pm/V, whereas the electromechanical coupling factors k(p) and k(t) were 44.5% and 41.6%, respectively. Bulk P-E hysteresis loop was obtained with saturation polarization 11 mu C/cm(2) and coercive field similar to 4 kV/cm. Distinct polarization contrast with a complex mosaic-like domain structure was observed in the out-of-plane mode of piezoresponse force microscopy. The domain width and the correlation length were estimated to be nearly 2 mu m and 827 nm, respectively. Local hysteresis loop with apparent coercive voltage, V-c = 15.8 V, was observed. (C) 2013 AIP Publishing LLC. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20726 |
DOI: | 10.1063/1.4808338 |
ISSN: | 0021-8979 |
Publisher Version: | 10.1063/1.4808338 |
Appears in Collections: | CICECO - Artigos |
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File | Description | Size | Format | |
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Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti 0.8)O3-0.5(Ba0.7Ca0.3)TiO 3 ceramic_10.10631.4808338.pdf | 3.25 MB | Adobe PDF | View/Open |
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