Preparation and Ferroelectric Properties of K0.5Na0.5NbO3 Thin Films Derived from Non-alcohol Niobium Salt Sol-gel Process |
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| Authors: | Deqing Zhang Fangyuan Zheng Xiuying Yang Lianzheng Feng Xiaoming Huang Hongmei Liu |
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| Affiliation: | 1. Key Laboratory of Fine Chemicals of College of Heilongjiang Province, Qiqihar University, Qiqihar 161006, China;2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, Chinacaomaosheng@bit.edu.cn zhdqing@163.com;4. School of Electronic Engineering, Heilongjiang University, Harbin 150080, China |
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| Abstract: | Lead-free K0.5Na0.5NbO3 (KNN) thin films were prepared on Pt (111) /Ti/SiO2/Si (100) substrates by a polyvinylpyrrolidone (PVP)-modified sol-gel method without any metal alkoxides. The effects of PVP on the crystallization, surface morphology and electrical properties were investigated. It was found that the introduction of PVP into the sol could reduce the annealing temperature, enhance the surface quality and improve the KNN film of (100) oriented growth. Compared with the pure non-PVP-modified KNN thin films, the dielectric and ferroelectric properties of the KNN films were significantly enhanced by adding PVP into the sol. In particular, the PVP-modified KNN films which were annealed at 550°C exhibited relatively saturated polarization-electric field (P-E) hysteresis loops with high remnant polarization Pr of 22 μC/cm2, dielectric constant of 280 and dielectric loss of 0.09, respectively, indicating promising lead-free piezoelectric film candidate for future applications. |
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| Keywords: | KNN films PVP sol-gel method hysteresis loop |
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