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http://hdl.handle.net/10773/20372
Title: | Unleashing the Full Sustainable Potential of Thick Films of Lead-Free Potassium Sodium Niobate (K0.5Na0.5NbO3) by Aqueous Electrophoretic Deposition |
Author: | Mahajan, Amit Pinho, Rui Dolhen, Morgane Elisabete Costa, M. Vilarinho, Paula M. |
Keywords: | TEMPERATURE-DEPENDENCE DIELECTRIC-PROPERTIES FREE PIEZOCERAMICS DOMAIN-STRUCTURE CERAMICS SUSPENSION OXIDE EPD EVOLUTION |
Issue Date: | 2016 |
Publisher: | AMER CHEMICAL SOC |
Abstract: | A current challenge for the fabrication of functional oxide-based devices is related with the need of environmental and sustainable materials and processes. By considering both lead-free ferroelectrics of potassium sodium niobate (K0.5Na0.5NbO3, KNN) and aqueous-based electrophoretic deposition here we demonstrate that an eco-friendly aqueous solution-based process can be used to produce KNN thick coatings with improved electromechanical performance. KNN thick films on platinum substrates with thickness varying between 10 and 15 mu m have a dielectric permittivity of 495, dielectric losses of 0.08 at 1 MHz, and a piezoelectric coefficient d(33) of, similar to 70 pC/N. At T-C these films display a relative permittivity of 2166 and loss tangent of 0.11 at 1 MHz. A comparison of the physical properties between these films and their bulk ceramics counterparts demonstrates the impact of the aqueous-based electrophoretic deposition (EPD) technique for the preparation of lead-free ferroelectric thick films. This opens the door to the possible development of high-performance, lead-free piezoelectric thick films by a sustainable low-cost process, expanding the applicability of lead-free piezoelectrics. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20372 |
DOI: | 10.1021/acs.langmuir.6b00669 |
ISSN: | 0743-7463 |
Publisher Version: | 10.1021/acs.langmuir.6b00669 |
Appears in Collections: | CICECO - Artigos |
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