University of Oulu

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,

Upside-down composites : fabricating piezoceramics at room temperature

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Author: Nelo, Mikko1; Siponkoski, Tuomo1; Kähäri, Hanna2;
Organizations: 1Microelectronics research unit, University of Oulu, P.O.Box 4500, FI-90014, Finland
2Nokia Oyj. / Oulu, Kaapelitie 4, 90650, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.8 MB)
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Language: English
Published: Elsevier, 2019
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.

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Series: Journal of the European Ceramic Society
ISSN: 0955-2219
ISSN-E: 1873-619X
ISSN-L: 0955-2219
Volume: 39
Issue: 11
Pages: 3301 - 3306
DOI: 10.1016/j.jeurceramsoc.2019.04.052
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: 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).
EU Grant Number: (291132) ULTIMATE CERAMICS - Printed Electroceramics with Ultimate Compositions
Academy of Finland Grant Number: 267573
Detailed Information: 267573 (Academy of Finland Funding decision)
298409 (Academy of Finland Funding decision)
Copyright information: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (