Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17981
Title: TiO2-nonstoichiometry dependence on piezoelectric properties and depolarization temperature of (Bi0.5Na0.5) 0.94Ba0.06TiO3 lead-free ceramics
Authors: Wang, XX
Or, SW 
Tang, XG
Chan, HLW 
Choy, PK
Liu, PCK
Keywords: Ferroelectrics
Dielectric response
Phase transition
Piezoelectricity
Issue Date: 2005
Publisher: Pergamon Press
Source: Solid state communications, 2005, v. 134, no. 10, p. 659-663 How to cite?
Journal: Solid state communications 
Abstract: (Bi0.5Na0.5)0.94Ba0.06Ti xO1+2x lead-free piezoceramics with x varying from 0.97 to 1.03 were fabricated and characterized in order to investigate the effects of TiO2-nonstoichiometry on the piezoelectric properties and depolarization temperature of (Bi0.5Na0.5) 0.94Ba0.06TiO3 composition. X-ray diffraction (XRD) analysis showed that all samples have a single phase of perovskite structure with rhombohedral symmetry. Piezoelectric and dielectric measurements revealed that deficiency of TiO2 leads to an increase in the piezoelectric coefficient (d33), free relative permittivity (ε33T/ε0), and loss tangent (tan δ) besides an increase in the electromechanical coupling coefficient (kp) within a certain amount, while excess of TiO2 results in a decrease in kp, d 33, and ε33T/ε0, but an increase in tan δ. Depolarization temperature (Td) measurement indicated a decrease and an increase in Td as a result of increasing TiO2 deficiency and TiO2 excess, respectively. This TiO 2-nonstoichiometry also induced changes in the remanent polarization (Pr) and coercive field (Ec) of the ceramics.
URI: http://hdl.handle.net/10397/17981
ISSN: 0038-1098
EISSN: 1879-2766
DOI: 10.1016/j.ssc.2005.03.018
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