Unleashing the Full Sustainable Potential of Thick Films of Lead-Free Potassium Sodium Niobate (K0.5Na0.5NbO3) by Aqueous Electrophoretic Deposition
authors Mahajan, A; Pinho, R; Dolhen, M; Costa, ME; Vilarinho, PM
nationality International
journal LANGMUIR
keywords TEMPERATURE-DEPENDENCE; DIELECTRIC-PROPERTIES; FREE PIEZOCERAMICS; DOMAIN-STRUCTURE; CERAMICS; SUSPENSION; OXIDE; EPD; EVOLUTION
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.
publisher AMER CHEMICAL SOC
issn 0743-7463
year published 2016
volume 32
issue 21
beginning page 5241
ending page 5249
digital object identifier (doi) 10.1021/acs.langmuir.6b00669
web of science category Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary
subject category Chemistry; Materials Science
unique article identifier WOS:000377151300003
  ciceco authors
  impact metrics
times cited (wos core): 1
journal impact factor (jcr 2016): 3.833
5 year journal impact factor (jcr 2016): 4.205
category normalized journal impact factor percentile (jcr 2016): 75.189
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