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TiO2-nonstoichiometry dependence on piezoelectric properties and depolarization temperature of (Bi0.5Na0.5)0.94Ba0.06TiO3lead-free ceramics

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
134
Issue
10
Identifiers
DOI: 10.1016/j.ssc.2005.03.018
Keywords
  • A. Ferroelectrics
  • D. Dielectric Response
  • D. Phase Transition
  • D. Piezoelectricity

Abstract

Abstract (Bi 0.5Na 0.5) 0.94Ba 0.06Ti x O 1+2 x lead-free piezoceramics with x varying from 0.97 to 1.03 were fabricated and characterized in order to investigate the effects of TiO 2-nonstoichiometry on the piezoelectric properties and depolarization temperature of (Bi 0.5Na 0.5) 0.94Ba 0.06TiO 3 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 TiO 2 leads to an increase in the piezoelectric coefficient ( d 33), free relative permittivity ( ε 33 T / ε 0 ), and loss tangent (tan δ) besides an increase in the electromechanical coupling coefficient ( k p) within a certain amount, while excess of TiO 2 results in a decrease in k p, d 33, and ε 33 T / ε 0 , but an increase in tan δ. Depolarization temperature ( T d) measurement indicated a decrease and an increase in T d as a result of increasing TiO 2 deficiency and TiO 2 excess, respectively. This TiO 2-nonstoichiometry also induced changes in the remanent polarization ( P r) and coercive field ( E c) of the ceramics.

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