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

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 val...

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Detalles Bibliográficos
Autores: Vendrell Villafruela, Xavier|||0000-0003-4705-8253, García García, José Eduardo|||0000-0002-1232-1739, Bril, X, Ochoa Guerrero, Diego A.|||0000-0002-8756-9704, Mestres, Lourdes, Dezanneau, Guillem
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/24962
Acceso en línea:https://hdl.handle.net/2117/24962
https://dx.doi.org/10.1016/j.jeurceramsoc.2014.08.033
Access Level:acceso abierto
Palabra clave: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
Àrees temàtiques de la UPC::Física
Descripción
Sumario: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.

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