Synthesis and characterization of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramic

Abstract

Articles you may be interested inSymmetry determination on Pb-free piezoceramic 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 using convergent beam electron diffraction method J. Appl. Phys. 115, 054108 (2014) 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 C as the temperature of maximum permittivity. The macroscopic values of d 33 and d 31 were $350 pC/N and À141 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 lC/cm 2 and coercive field $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 lm and 827 nm, respectively. Local hysteresis loop with apparent coercive voltage, V c ¼ 15.8 V, was observed. V C 2013 AIP Publishing LLC. [http://dx

Domain structures and local switching in lead-free piezoceramics Ba0.85Ca0.15Ti0.90Zr0.10O3

“…21 Detailed procedure of the samples preparation and their structural characterization can be found elsewhere. 20 The grain size in the BCZT samples was in the range from 4 to18 lm. Ceramic pellets were polished to optical quality by using diamond paste and cleaned in alcohol and acetone afterwards.…”

“…It was found that ferroelectric domains become miniaturized down to a nanometer size with apparent domain hierarchy that is coincident with the d 33 -maximum region on the phase diagram. First Piezoresponse Force Microscopy (PFM) study 20 revealed a complex mosaic-like domain structure with sub-lm domain periodicity and clear nanoscale polarization switching as documented by the nanoscale piezoresponse hysteresis loops. This work is focused on further study of the 50 BZT 50BCT lead-free system using nanoscale piezoelectric methods.…”

Local piezo-response for lead-free Ba0.9Ca0.1Ti0.9Zr0.1O3 electro-ceramic by switching spectroscopy

“…Among lead free electro-ceramics with good dielectric and ferro/piezo electric properties, the 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 is the most promising binary system for the substitution of commonly commercial PZT [1][2][3] . As an example, Liu et al 4 reported a high piezoelectric coefficient d 33 ~690 pC/N for this binary composition.…”

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

“…337 The compositional range of BZT-BCT for actuator applications (red blurred shaded area) comprises pseudocubic materials with weak relaxor features. 338,339 Nevertheless, detailed XRD experiments were able to reveal the average atomic structure of the system. 331,333 It must be pointed out, however, that the short-range structure of the BZT-BCT differs from its long-range order similarly as in relaxor materials.…”