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Title: Piezoelectric properties of Li- and Ta-modified (K{sub 0.5}Na{sub 0.5})NbO{sub 3} ceramics

Abstract

Lead-free, potassium sodium niobate piezoelectric ceramics substituted with lithium (K{sub 0.5-x/2},Na{sub 0.5-x/2},Li{sub x})NbO{sub 3} or lithium and tantalum (K{sub 0.5-x/2},Na{sub 0.5-x/2},Li{sub x})(Nb{sub 1-y},Ta{sub y})O{sub 3} have been synthesized by traditional solid state sintering. The compositions chosen are among those recently reported to show high piezoelectric properties [Y. Saito, H. Takao, T. Tani, T. Nonoyama, K. Takatori, T. Homma, T. Nagaya, and M. Nakamura, Nature (London) 42, 84 (2004); Y. Guo, K. Kakimoto, and H. Ohsato, Appl. Phys. Lett. 85, 4121 (2004); Mater. Lett. 59, 241 (2005)]. We show that high densities and piezoelectric properties can be obtained for all compositions by pressureless sintering in air, without cold isostatic pressing, and without any sintering aid or special powder treatment. Resonance and converse piezoelectric (strain-field) measurements show a thickness coupling coefficient k{sub t} of 53% and converse piezoelectric coefficient d{sub 33} around 200 pm/V for the Li-substituted ceramics, and a k{sub t} of 52% and d{sub 33} over 300 pm/V for the Li- and Ta-modified samples. The unipolar strain-field hysteresis is small and comparable to that measured under similar conditions in hard Pb(Zr,Ti)O{sub 3}. A peak of piezoelectric properties can be noted close to the morphotropic phase boundary. These ceramics look verymore » promising as possible, practicable, lead-free replacements for lead zirconate titanate.« less

Authors:
; ; ;  [1]
  1. Ceramics Laboratory, Ecole Polytechnique Federale de Lausanne-EPFL, Lausanne (Switzerland)
Publication Date:
OSTI Identifier:
20706411
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 87; Journal Issue: 18; Other Information: DOI: 10.1063/1.2123387; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AIR; CERAMICS; DIELECTRIC MATERIALS; HYSTERESIS; LITHIUM COMPOUNDS; NIOBATES; PIEZOELECTRICITY; POTASSIUM COMPOUNDS; POWDERS; PZT; RESONANCE; SINTERING; SODIUM COMPOUNDS; STRAINS; TANTALUM COMPOUNDS; THICKNESS

Citation Formats

Hollenstein, Evelyn, Davis, Matthew, Damjanovic, Dragan, and Setter, Nava. Piezoelectric properties of Li- and Ta-modified (K{sub 0.5}Na{sub 0.5})NbO{sub 3} ceramics. United States: N. p., 2005. Web. doi:10.1063/1.2123387.
Hollenstein, Evelyn, Davis, Matthew, Damjanovic, Dragan, & Setter, Nava. Piezoelectric properties of Li- and Ta-modified (K{sub 0.5}Na{sub 0.5})NbO{sub 3} ceramics. United States. doi:10.1063/1.2123387.
Hollenstein, Evelyn, Davis, Matthew, Damjanovic, Dragan, and Setter, Nava. Mon . "Piezoelectric properties of Li- and Ta-modified (K{sub 0.5}Na{sub 0.5})NbO{sub 3} ceramics". United States. doi:10.1063/1.2123387.
@article{osti_20706411,
title = {Piezoelectric properties of Li- and Ta-modified (K{sub 0.5}Na{sub 0.5})NbO{sub 3} ceramics},
author = {Hollenstein, Evelyn and Davis, Matthew and Damjanovic, Dragan and Setter, Nava},
abstractNote = {Lead-free, potassium sodium niobate piezoelectric ceramics substituted with lithium (K{sub 0.5-x/2},Na{sub 0.5-x/2},Li{sub x})NbO{sub 3} or lithium and tantalum (K{sub 0.5-x/2},Na{sub 0.5-x/2},Li{sub x})(Nb{sub 1-y},Ta{sub y})O{sub 3} have been synthesized by traditional solid state sintering. The compositions chosen are among those recently reported to show high piezoelectric properties [Y. Saito, H. Takao, T. Tani, T. Nonoyama, K. Takatori, T. Homma, T. Nagaya, and M. Nakamura, Nature (London) 42, 84 (2004); Y. Guo, K. Kakimoto, and H. Ohsato, Appl. Phys. Lett. 85, 4121 (2004); Mater. Lett. 59, 241 (2005)]. We show that high densities and piezoelectric properties can be obtained for all compositions by pressureless sintering in air, without cold isostatic pressing, and without any sintering aid or special powder treatment. Resonance and converse piezoelectric (strain-field) measurements show a thickness coupling coefficient k{sub t} of 53% and converse piezoelectric coefficient d{sub 33} around 200 pm/V for the Li-substituted ceramics, and a k{sub t} of 52% and d{sub 33} over 300 pm/V for the Li- and Ta-modified samples. The unipolar strain-field hysteresis is small and comparable to that measured under similar conditions in hard Pb(Zr,Ti)O{sub 3}. A peak of piezoelectric properties can be noted close to the morphotropic phase boundary. These ceramics look very promising as possible, practicable, lead-free replacements for lead zirconate titanate.},
doi = {10.1063/1.2123387},
journal = {Applied Physics Letters},
number = 18,
volume = 87,
place = {United States},
year = {Mon Oct 31 00:00:00 EST 2005},
month = {Mon Oct 31 00:00:00 EST 2005}
}