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Título:	Improving the functional properties of (K0.5Na0.5)NbO3 piezoceramics by acceptor doping
Autor/a:	Vendrell Villafruela, Xavier; García García, José Eduardo; Bril, X; Ochoa Guerrero, Diego A.; Mestres, Lourdes; Dezanneau, Guillem
Otros autores:	Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. CEMAD - Caracterització Elèctrica de Materials i Dispositius
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.
Materia(s):	-Àrees temàtiques de la UPC::Física -Piezoelectric ceramics -Dielectric properties -Microstructure -Potassium -Sodium -Barium titanate -Lead-free piezoceramics -Acceptor doping -Piezoelectric properties -(K -Na)NbO3 -BARIUM-TITANATE CERAMICS -LEAD-FREE PIEZOCERAMICS -PIEZOELECTRIC PROPERTIES -ELECTRICAL-PROPERTIES -(NA0.5K0.5)NBO3-LINBO3 CERAMICS -DIELECTRIC-PROPERTIES -MICROSTRUCTURE -POTASSIUM -BEHAVIOR -SODIUM -Ceràmica piezoelèctrica -Dielèctrics -Microestructura -Potassi -Sodi
Derechos:	Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Tipo de documento:	Artículo - Versión publicada Artículo
Editor:	Elsevier
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