NDLI: Effect of Li- and Ta-doping on the ferroelectric properties of Na$_{0.5}$K$_{0.5}$NbO$_{3}$ thin films prepared by a chelate route

Content Provider	Springer Nature Link
Author	Solarte, A. Fernández Pellegri, N. Sanctis, O. Stachiotti, M. G.
Copyright Year	2013
Abstract	The effects of lithium and tantalum doping on the properties of Na$_{0.5}$K$_{0.5}$NbO$_{3}$ (NKN) thin films were investigated. The films were fabricated by an optimized chelate route which offers the advantage of a simple and rapid solution synthesis. The optimization was achieved by investigating the effects of alkaline volatilization loss on film properties. In this way, undoped NKN thin films fabricated by this conventional method exhibited good ferroelectric properties (P$_{r}$ ~ 8 μC/cm$^{2}$, and E$_{c}$ ~ 55 kV/cm for films annealed at 650 °C). The developed chelate route was then used to grow Li (5 %) and Ta (10 %) substituted thin films. Such structures allowed us to compare the effect of these dopant cations on phase formation, microstructure and ferroelectric properties. We show that both modifications produced a remarkable improvement on the ferroelectricity of the films. While the undoped material exhibited large leakage components in films annealed at 600 °C, films modified with Li or Ta presented well saturated ferroelectric hysteresis loops, indicating that those ions have a significant influence on the conducting process. The remnant polarizations of the Ta-doped films are greater than those of the Li-doped samples. This feature is however reversed for films annealed at low temperature (600 °C) due to the presence of a non-ferroelectric secondary phase in the Ta-doped composition.
Starting Page	488
Ending Page	496
Page Count	9
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	66
Issue Number	3
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2013-04-19
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ferroelectric thin films Lead-free piezoelectrics Sol–Gel Ceramics, Glass, Composites, Natural Methods Inorganic Chemistry Optical and Electronic Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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