caa a22 4500 445362693 CHVBK 20180317142920.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10832-010-9609-4 doi (NATIONALLICENCE)springer-10.1007/s10832-010-9609-4 Non-uniform electric field in poling of structurally graded monolithic piezoactuator [Elektronische Daten] [Jaakko Palosaari, Jari Juuti, Esa Heinonen, Veli-Pekka Moilanen, Heli Jantunen] In this paper the effect of a non-uniform electric poling field and its optimisation for structurally graded piezoelectric actuators are investigated. The two compared actuator structures were both based on commercial PZT 5H bulk discs with thicknesses of 375µm (Ø 25mm), where one was machined into a graded structure with a step-like decrease of the thickness towards the centre and one intact. The hysteresis loops of the pre-stressed concave shaped actuators were measured under 0.5-5.0kV/mm electric fields at 25-100°C temperatures, and the remanent polarization and coercive electric field were determined. The graded structured actuator obtained ∼10% higher coercive field compared to the non-graded actuator, when measured at 25°C and 5.0kV/mm. On the other hand the remanent polarisation values of the graded actuator were slightly lower than non graded bulk values. However the maximum decrease was only 9.6% under 5.0kV/mm. The results show that strain and stress gradients in the structure are generated when exposed to an electric field. Furthermore, as a consequence of the restricted dimension changes, an inherent bending of the monolithic ceramic structure was obtained which can be utilised, for example, in miniaturised micro-machined actuators or in larger pre-stressed benders. Springer Science+Business Media, LLC, 2010 Piezoelectric nationallicence Gradient nationallicence Actuator nationallicence Monolithic nationallicence Palosaari Jaakko Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut Juuti Jari Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut Heinonen Esa Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut Moilanen Veli-Pekka Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut Jantunen Heli Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut Journal of Electroceramics Springer US; http://www.springer-ny.com 27/1(2011-08-01), 20-23 1385-3449 27:1<20 2011 27 10832 https://doi.org/10.1007/s10832-010-9609-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10832-010-9609-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Palosaari Jaakko Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut NATIONALLICENCE 700 1- Juuti Jari Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut NATIONALLICENCE 700 1- Heinonen Esa Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut NATIONALLICENCE 700 1- Moilanen Veli-Pekka Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut NATIONALLICENCE 700 1- Jantunen Heli Microelectronics and Materials Physics Laboratories, EMPART Research Group of Infotech, University of Oulu, P.O.Box 4500, Fin-90014, Oulu, Finland aut NATIONALLICENCE 773 0- Journal of Electroceramics Springer US; http://www.springer-ny.com 27/1(2011-08-01), 20-23 1385-3449 27:1<20 2011 27 10832 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer