Mikko Nelo, Tuomo Siponkoski, Hanna Kähäri, Krisztian Kordas, Jari Juuti, Heli Jantunen, Upside - down composites: Fabricating piezoceramics at room temperature, Journal of the European Ceramic Society, Volume 39, Issue 11, 2019, Pages 3301-3306, ISSN 0955-2219, https://doi.org/10.1016/j.jeurceramsoc.2019.04.052
Upside - down composites : fabricating piezoceramics at room temperature
|Author:||Nelo, Mikko1; Siponkoski, Tuomo1; Kähäri, Hanna2;|
1Microelectronics research unit, University of Oulu, P.O.Box 4500, FI-90014, Finland
2Nokia Oyj. / Oulu, Kaapelitie 4, 90650, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 1.8 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2019091628343
|Publish Date:|| 2019-09-16
Piezoelectric materials have a multi-billion dollar impact on the electromechanical transducers market. Their conventional synthesis includes a sintering step (at over 1000 °C) that often hampers direct integration into monolithic devices and confines their applications to heterostructures made using tedious multi-step assembly or to composites with poor electromechanical behavior. Here, we demonstrate a new and easy to scale method for the integration of piezoelectric ceramics at ultra-low temperatures without compromising their functionality. We show that all-ceramic “upside-down” composites with exceptionally high fractions of piezoelectric filler (−75 vol. %) and low porosity can be achieved using aqueous dispersion of lithium molybdate as a binder. The method is based only on coating, mixing, moulding and drying sequences. The measured piezoelectric charge coefficient, d33 −84 pC·N−1, outperforms any other known composite, whereas the voltage constant, g33 -33 mV m·N−1, competes with bulk materials, thus paving the way for versatile applications not previously considered.
Journal of the European Ceramic Society
|Pages:||3301 - 3306|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
213 Electronic, automation and communications engineering, electronics
The work leading to these results has received funding from the European Research Council (ERC) under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement No. 291132. Authors J.J. and J.P. acknowledge the funding by the Academy of Finland (grant agreements No. 267573 and 298409).
|Academy of Finland Grant Number:||
267573 (Academy of Finland Funding decision)
298409 (Academy of Finland Funding decision)
© 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).