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

Autor: Guilhem Dezanneau, Jose E. García, Xavier Vendrell, Lourdes Mestres, Diego A. Ochoa, X. Bril
Přispěvatelé: Universitat de Barcelona (UB), Universitat Politècnica de Catalunya [Barcelona] (UPC), Laboratoire Structures, Propriétés et Modélisation des solides (SPMS), Institut de Chimie du CNRS (INC)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Universitat de Barcelona, Universitat Politècnica de Catalunya. Departament de Física Aplicada, Universitat Politècnica de Catalunya. CEMAD - Caracterització Elèctrica de Materials i Dispositius
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Barium titanate
02 engineering and technology
Microestructura
01 natural sciences
Solid state chemistry
Materials Chemistry
Microstructure
010302 applied physics
[PHYS]Physics [physics]
Condensed matter physics
ELECTRICAL-PROPERTIES
021001 nanoscience & nanotechnology
POTASSIUM
Ceràmica piezoelèctrica
Química de l'estat sòlid
Dielectric properties
Acceptor doping
DIELECTRIC-PROPERTIES
0210 nano-technology
BEHAVIOR
Na)NbO3
Materials science
Piezoelectric coefficient
Piezoelectricity
Nanotechnology
BARIUM-TITANATE CERAMICS
LEAD-FREE PIEZOCERAMICS
Dielectric
Dielèctrics
Piezoelectric ceramics
Ceràmiques electròniques
PIEZOELECTRIC PROPERTIES
0103 physical sciences
[CHIM]Chemical Sciences
Dopant
Física [Àrees temàtiques de la UPC]
Doping
Sodium
(K
Coercivity
Potassi
Electronic ceramics
Sodi
Lead
Ceramics and Composites
(NA0.5K0.5)NBO3-LINBO3 CERAMICS
Curie temperature
Plom
Piezoelectricitat
Zdroj: Journal of the European Ceramic Society
Journal of the European Ceramic Society, Elsevier, 2015, 35 (1), pp.125-130. ⟨10.1016/j.jeurceramsoc.2014.08.033⟩
Recercat. Dipósit de la Recerca de Catalunya
instname
Dipòsit Digital de la UB
Universidad de Barcelona
Universitat Jaume I
UPCommons. Portal del coneixement obert de la UPC
Universitat Politècnica de Catalunya (UPC)
ISSN: 0955-2219
Popis: 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.
Databáze: OpenAIRE
Externí odkaz: