期刊
LANGMUIR
卷 32, 期 21, 页码 5241-5249出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.6b00669
关键词
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资金
- project CICECO-Aveiro Institute of Materials [POCI-01-0145-FEDER-007679, UID/CTM/50011/2013]
- FCT/MEC
- FEDER
- FCT [SFRH/BD/65415/2009]
- University of Limoges within ERASMUS MUNDUS
- Fundação para a Ciência e a Tecnologia [SFRH/BD/65415/2009] Funding Source: FCT
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.
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