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The 12BaO·7Al2O3 (B12A7) thin films have been prepared via sol–gel process. Optical and electrical properties of B12A7 films have been investigated. The films were coated on soda lime float glass by the dip coating process, and annealed in air and hydrogen (H2) at 450 °C for 2 h. The UV absorption edge was red shifted for films annealed in H2 atmosphere. The B12A7 films had high transparency about...