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. 2024 Jul 12;14(14):1186.
doi: 10.3390/nano14141186.

Physical Properties of CaTiO3-Modified NaNbO3 Thin Films

Yongmei Xue  1 , Li Ma  1 , Zhuokun Han  2 , Jianwei Liu  1 , Zejun Wang  1 , Pengcheng Liu  3 , Yu Zhang  4 , Huijuan Dong  1
Affiliations

Physical Properties of CaTiO3-Modified NaNbO3 Thin Films

Yongmei Xue et al. Nanomaterials (Basel). .

Abstract

NaNbO3(NN)-based lead-free materials are attracting widespread attention due to their environment-friendly and complex phase transitions, which can satisfy the miniaturization and integration for future electronic components. However, NN materials usually have large remanent polarization and obvious hysteresis, which are not conducive to energy storage. In this work, we investigated the effect of introducing CaTiO3((1-x)NaNbO3-xCaTiO3) on the physical properties of NN. The results indicated that as x increased, the surface topography, oxygen vacancy and dielectric loss of the thin films were significantly improved when optimal value was achieved at x = 0.1. Moreover, the 0.9NN-0.1CT thin film shows reversible polarization domain structures and well-established piezoresponse hysteresis loops. These results indicate that our thin films have potential application in future advanced pulsed power electronics.

Keywords: NaNbO3; lead-free; physical properties.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Preparation process for (1−x)NN-xCT thin films by sol-gel method.
Figure 2
Figure 2
XRD patterns for (1−x)NN-xCT thin films on (111) Pt/Ti/SiO2/Si substrates.
Figure 3
Figure 3
AFM and cross-SEM images of (1−x)NN-xCT thin films. (a,d) x = 0, (b,e) x = 0.1, (c,f) x = 0.2.
Figure 4
Figure 4
XPS spectra of (1−x)NN-xCTthin films: (a) XPS survey spectra, (b) relative area ratios of Ob/Oa as a function of x-level, (c) narrow scan Na 1s and Nb 3d XPS spectra.
Figure 5
Figure 5
Frequency—dependent dielectric constant (three curves surrounded the black circles with left arrows) and loss (three curves surrounded the black circles with right arrows) of (1−x)NN-xCT thin films.
Figure 6
Figure 6
Amplitude hysteresis loops (a) and local phase (b) acquired in the 0.9NN-0.1CT thin film.
See this image and copyright information in PMC

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