The synthesis of lead-free ferroelectric Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3 thin films by sol-gel method |
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| Authors: | T. Yu K.W. Kwok H.L.W. Chan |
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| Affiliation: | Department of Applied Physics and Materials Research Centre The Hong Kong Polytechnic University Kowloon, Hong Kong, China |
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| Abstract: | (1 − x)Bi0.5Na0.5TiO3-xBi0.5K0.5TiO3 [BNT-BKT-100x] thin films have been successfully deposited on Pt/Ti/SiO2/Si substrates by a sol-gel process together with rapid thermal annealing. A morphotropic phase boundary (MPB) between Bi0.5Na0.5TiO3 and Bi0.5K0.5TiO3 was determined around x ∼ 0.15. Near the MPB, the film exhibits the largest grain size, the highest ε value (360) and the largest Pr value (13.8 μC/cm2). The BNT-BKT thin film system is expected to be a new and promising candidate for lead-free piezoelectric applications. |
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| Keywords: | 77.55.+f 77.80.&minus e 77.80.Dj |
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