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Abstract In this research program, the optical, electrical and photocatalysis roperties of pure and metal substitution barium titanate (BaTi03) and barium trititanate (BaTb07) nanopowders have been investigated. Barium titanate and barium trititanate nanopowders were synthesized ’via wet hemical methods. Barium titanate (BaTi03) nanopowders were prepared ,)’ sol-gel auto-combustion method by annealing the precursor at 1000 C for 2 h in neutral and acidic medium. Moreover, BaTi03 nanopowders have also fabricated using simple eo-precipitation method at pH= 10 at annealing temperature of 1000 ’c for 2 h. Otherwise, barium trititanate BaTi;O,) nanopowders were obtained using sol-gel auto-combustion method in neutral and acidic medium and eo-precipitation method at pH=IO. In addition, Cu2+, Mn2+, Ni2+ ions substituted BaTi03 led to form BaTi;O, as secondary phase. Moreover, Cu2+, Mn2~, Ni2+ ions substituted BaTi;O, led to form pure BaTi307. The optical, electrical and photocatalysis properties of pure and metal substituted BaTi03 and BaTi,O- nanopowders were studied in details. Band gap energy was hanged with substitution of different metal ions. The real permittivity (e) values were improved with different metal substitution. Furthermore, the photocatalytic activity was affected by metal substitution. ay words: Smart material, Barium titanate, Barium trititanate, Wet hemical methods, Sol-gel auto combustion method, Cc-precipitation method, Metal substitution; Optical properties, Band gap, Electrical properties, Photocatalysis properties |