Abstract
Highly (100)-oriented BiFeO 3–(Na 0.5Bi 0.5)TiO 3 thin films without undesirable phases were synthesized by chemical solution deposition. The preparation of BiFeO 3–(Na 0.5Bi 0.5)TiO 3 sol and deposition procedure were studied. BiFeO 3–(Na 0.5Bi 0.5)TiO 3 thin films were deposited onto SiO 2/Si substrates via a sol–gel method, with LaNiO 3 as buffer layer. X-ray diffraction analyses show that the BiFeO 3–(Na 0.5Bi 0.5)TiO 3 films are highly (1 0 0)-oriented due to lattice match growth. Smooth surface with evenly distributed grains as small as about 50 nm were observed by scanning electron microscope. The dielectric and insulating characteristics against applied field, and optical properties were studied. It is found that the introduction of Ti 4+ reduces the number of oxygen vacancy greatly and thus can suppress the leaking current. The film has a conspicuous absorption in the blue and green light region, and band gap of about 2.74 eV.
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