الفهرس 
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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