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

X. X. Wang; Siu Wing Or; X. G. Tang; H. L.W. Chan; P. K. Choy; P. C.K. Liu

doi:10.1016/j.ssc.2005.03.018

TiO₂-nonstoichiometry dependence on piezoelectric properties and depolarization temperature of (Bi_0.5Na_0.5)_0.94Ba_0.06TiO₃lead-free ceramics

X. X. Wang, Siu Wing Or, X. G. Tang, H. L.W. Chan, P. K. Choy, P. C.K. Liu

The Hong Kong Polytechnic University

Research output: Journal article publication › Journal article › Academic research › peer-review

47 Citations (Scopus)

Abstract

(Bi0.5Na0.5)0.94Ba0.06TixO1+2xlead-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)0.94Ba0.06TiO3composition. 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 TiO2leads 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 TiO2results in a decrease in kp, d33, and ε33T/ε0, but an increase in tan δ. Depolarization temperature (Td) measurement indicated a decrease and an increase in Tdas a result of increasing TiO2deficiency and TiO2excess, respectively. This TiO2-nonstoichiometry also induced changes in the remanent polarization (Pr) and coercive field (Ec) of the ceramics.

Original language	English
Pages (from-to)	659-663
Number of pages	5
Journal	Solid State Communications
Volume	134
Issue number	10
DOIs	https://doi.org/10.1016/j.ssc.2005.03.018
Publication status	Published - 1 Jun 2005

Keywords

A. Ferroelectrics
D. Dielectric response
D. Phase transition
D. Piezoelectricity

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

More information

10.1016/j.ssc.2005.03.018

Cite this

@article{ae8714abec504e10a5a0754b285aaf18,

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

abstract = "(Bi0.5Na0.5)0.94Ba0.06TixO1+2xlead-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)0.94Ba0.06TiO3composition. 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 TiO2leads 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 TiO2results in a decrease in kp, d33, and ε33T/ε0, but an increase in tan δ. Depolarization temperature (Td) measurement indicated a decrease and an increase in Tdas a result of increasing TiO2deficiency and TiO2excess, respectively. This TiO2-nonstoichiometry also induced changes in the remanent polarization (Pr) and coercive field (Ec) of the ceramics.",

keywords = "A. Ferroelectrics, D. Dielectric response, D. Phase transition, D. Piezoelectricity",

author = "Wang, {X. X.} and Or, {Siu Wing} and Tang, {X. G.} and Chan, {H. L.W.} and Choy, {P. K.} and Liu, {P. C.K.}",

year = "2005",

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T1 - TiO2-nonstoichiometry dependence on piezoelectric properties and depolarization temperature of (Bi0.5Na0.5)0.94Ba0.06TiO3lead-free ceramics

AU - Wang, X. X.

AU - Or, Siu Wing

AU - Tang, X. G.

AU - Chan, H. L.W.

AU - Choy, P. K.

AU - Liu, P. C.K.

PY - 2005/6/1

Y1 - 2005/6/1

N2 - (Bi0.5Na0.5)0.94Ba0.06TixO1+2xlead-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)0.94Ba0.06TiO3composition. 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 TiO2leads 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 TiO2results in a decrease in kp, d33, and ε33T/ε0, but an increase in tan δ. Depolarization temperature (Td) measurement indicated a decrease and an increase in Tdas a result of increasing TiO2deficiency and TiO2excess, respectively. This TiO2-nonstoichiometry also induced changes in the remanent polarization (Pr) and coercive field (Ec) of the ceramics.

AB - (Bi0.5Na0.5)0.94Ba0.06TixO1+2xlead-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)0.94Ba0.06TiO3composition. 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 TiO2leads 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 TiO2results in a decrease in kp, d33, and ε33T/ε0, but an increase in tan δ. Depolarization temperature (Td) measurement indicated a decrease and an increase in Tdas a result of increasing TiO2deficiency and TiO2excess, respectively. This TiO2-nonstoichiometry also induced changes in the remanent polarization (Pr) and coercive field (Ec) of the ceramics.

KW - A. Ferroelectrics

KW - D. Dielectric response

KW - D. Phase transition

KW - D. Piezoelectricity

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DO - 10.1016/j.ssc.2005.03.018

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