Effects of Nd3+-substitution for Bi-site on the leakage current,ferroelectric and dielectric properties of Na0.5Bi0.5TiO3 thin films |
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| Authors: | CH Yang YJ Han XS Sun J Chen J Qian LX Chen |
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| Affiliation: | 1. School of Materials Science and Engineering, University of Jinan, Jinan 250022, China;2. Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China |
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| Abstract: | Perovskite Na0.5(Bi1?xNdx)0.5TiO3 (x = 0, 0.01, 0.03, 0.05; xNd: NBT) ferroelectric films were synthesized on indium tin oxide (ITO)/glass substrates via chemical solution deposition. Structural characterization shows the similar phase-pure perovskite structures in all the films and gradually decreased grain sizes with Nd3+ doping amount increasing. For all the films, the leakage behaviors are dominant by the Ohmic conduction in low electric field region and interface-limited Fowler-Nordheim tunneling mechanism in high electric field region. Additionally, the space-charge-limited conduction is involved in 0.03Nd: NBT sample. Compared with the sample of x = 0, the resistivity can be improved through Nd3+-substitution in NBT. Enhanced ferroelectricity can be obtained from the dynamic polarization-electric field test, and the reversible domains switching in film can be confirmed by static dielectric constant-electric field measurement. Especially, the 0.03Nd: NBT possesses optimal electrical performances with a large remanent polarization (Pr = 26.7 μC/cm2) and a high dielectric tunability (19.6% at 100 kHz). |
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| Keywords: | Perovskite Thin film Cation substitution Microstructure Electrical property |
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