Benefits of SPS sintering on microstructure and piezoelectric

Engineering Conferences International
ECI Digital Archives
Electric Field Assisted Sintering and Related
Phenomena Far From Equilibrium
Proceedings
Winter 3-9-2016
Benefits of SPS sintering on microstructure and
piezoelectric properties of KNN–based ceramics
Florian Jean
, Université François Rabelais de Tours, [email protected]
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Recommended Citation
Florian Jean, "Benefits of SPS sintering on microstructure and piezoelectric properties of KNN–based ceramics" in "Electric Field
Assisted Sintering and Related Phenomena Far From Equilibrium", Rishi Raj (University of Colorado at Boulder, USA) Thomas
Tsakalakos (Rutgers University, USA) Eds, ECI Symposium Series, (2016). http://dc.engconfintl.org/efa_sintering/33
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BENEFITS OF SPS SINTERING ON MICROSTRUCTURE AND PIEZOELECTRIC PROPERTIES OF
KNN-BASED CERAMICS
F. Jean, Laboratoire GREMAN UMR 7347, Université François Rabelais de Tours-CNRS-CEA-ENIVL,
IUT de BLOIS 15 rue de la chocolaterie, CS 2903, 41029 Blois Cedex, France,
[email protected]
M. Bah, Laboratoire GREMAN UMR 7347, Université François Rabelais de Tours-CNRS-CEA-ENIVL,
IUT de BLOIS 15 rue de la chocolaterie, CS 2903, 41029 Blois Cedex, France
F. Schoenstein, Laboratoire des Sciences des Procédés et des Matériaux, CNRS, LSPM – UPR 3407,
Université Paris 13, Sorbonne Paris Cité, 99 Avenue J.B. Clément, 93430 Villetaneuse, France.
F. Giovannelli, Laboratoire GREMAN UMR 7347, Université François Rabelais de Tours-CNRS-CEAENIVL, IUT de BLOIS 15 rue de la chocolaterie, CS 2903, 41029 Blois Cedex, France
I. Monot-Laffez, Laboratoire GREMAN UMR 7347, Université François Rabelais de Tours-CNRSCEA-ENIVL, IUT de BLOIS 15 rue de la chocolaterie, CS 2903, 41029 Blois Cedex, France
Key Words: Spark plasma sintering, lead-free, piezoelectric materials
PZT and its derivatives exhibit a wide range of piezoelectric properties allowing their applications in
transducers, actuators and sensors. However, due to the toxicity of lead for human health and
environment, many studies are carried out on lead-free piezoelectric materials. Among these
materials, (K,Na)NbO3 (KNN)-based solid solutions seem to be promising candidates owing to their
high dielectric, piezoelectric and mechanical characteristics shown by Saito et al. in 2004. However,
reaching high density for these materials appears difficult and alkali volatilization may occur during
sintering process. In order to overcome these difficulties, in the present work, K0.5Na0.5NbO3 ceramics
are sintered with spark plasma sintering technique and comparatively studied with the classical
sintering technique. Their electromechanical properties are related to microstructure, density, pores
distribution, stoichiometry, grain boundaries and grain size. High thickness coupling factor of 45% and
interesting planar coupling coefficient of 48% are reached. To go further, by taking into account
previous studies in the literature, the effect of dopants such as Mn, Co, Ta and La on the sintering
behavior of KNN are investigated. Their impact on microstructures and piezoelectric properties are
presented comparatively, evidencing the efficiency and the benefit of SPS sintering in this system.