Abstract
The Lead-free piezoelectric polycrystalline materials, BaTiO3 (BTO) and Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) ceramic are prepared by sol-gel synthesis method. The synthesis dynamics and the effect of sintering temperature on the purity and the formation of morphotropic phase boundaries in these samples are investigated. X-ray Diffraction studies show the cubic phase for the BTO at low temperature, whereas it transforms into the tetragonal for high-temperature synthesis. The BCZT exists in the mixed phases of tetragonal and orthorhombic structures. Formation of MPBs in BCZT are observed for the sintering temperature above 1350 °C. Polarization (P) versus electric field (E) measurement shows enhanced polarization values for the BCZT in comparison to the BTO.
Highlights
Piezoelectric ceramics produce electricity upon the application of an external stress and vice versa
The amount of the piezoelectricity is characterized by the piezoelectric coefficient, d33 which measures the volume change when the piezoelectric material is subjected to the electric field
X-Ray Powder Diffraction (XRD) results confirm the BTO in tetragonal phase while BCZT exists in the mixed phase of tetragonal and orthorhombic
Summary
Piezoelectric ceramics produce electricity upon the application of an external stress and vice versa. The amount of the piezoelectricity is characterized by the piezoelectric coefficient, d33 which measures the volume change when the piezoelectric material is subjected to the electric field Such materials find many useful applications in the piezo generators, MEMS, sensors etc. There are several reports on the synthesis of BTO and BCZT using different techniques and characterized for the ferroelectricity [1,2,3,4,5] These piezo electrics forms a composite with any suitable magnetostrictive compounds, for example, NiFe2O4, Ni0.8Zn0.2Fe2O4, CoFe2O4 etc. In this work we focus on the synthesis of the piezoelectric BTO, BCZT using the sol-gel synthesis and it is very effective to get small grain size, high homogeneity and can be prepared at much lesser temperatures compared to solid state reaction [8]. We synthesize BTO and BCZT ceramics using the sol-gel method and report the structural, electrical properties
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