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Improving the functional properties of (K0.5Na0.5)NbO3 piezoceramics by acceptor doping

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10.1016/j.jeurceramsoc.2014.08.033
 
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hdl:2117/24962

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Vendrell Villafruela, XavierMés informacióMés informació
García García, José EduardoMés informacióMés informacióMés informació
Bril, X
Ochoa Guerrero, Diego A.Més informacióMés informacióMés informació
Mestres, Lourdes
Dezanneau, Guillem
Document typeArticle
Defense date2015-01-01
PublisherElsevier
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
ZrO2 and TiO2 modified lead-free (K0.5Na0.5)NbO3 (KNN) piezoelectric ceramics are prepared by a conventional solid-state reaction. The effect of acceptor doping on structural and functional properties is investigated. A decrease in the Curie temperature and an increase in the dielectric constant values are observed when doping. More interestingly, an increase in the coercive field E-c and remanent polarization P-r is observed. The piezoelectric properties are greatly increased when doping with small concentrations dopants. ZrO2 doped ceramic exhibits good piezoelectric properties with piezoelectric coefficient d(33) = 134 pC/N and electromechanical coupling factor k(p) = 35%. It is verified that nonlinearity is significantly reduced. Thus, the creation of complex defects capable of pinning the domain wall motion is enhanced with doping, probably due to the formation of oxygen vacancies. These results strongly suggest that compositional engineering using low concentrations of acceptor doping is a good means of improving the functional properties of KNN lead-free piezoceramic system. (C) 2014 Elsevier Ltd. All rights reserved.
CitationVendrell, X. [et al.]. Improving the functional properties of (K0.5Na0.5)NbO3 piezoceramics by acceptor doping. "Journal of the european ceramic society", 01 Gener 2015, vol. 35, núm. 1, p. 125-130. 
URIhttp://hdl.handle.net/2117/24962
DOI10.1016/j.jeurceramsoc.2014.08.033
ISSN0955-2219
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0955221914004622
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  • CEMAD - Caracterització elèctrica de materials i dispositius - Articles de revista [79]
  • Departament de Física Aplicada (fins octubre 2015) - Articles de revista [454]
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