For both initial powders, we note a decrease in E g for x = 5%, an increase to maximum for the middle STO contents, and a decreasing trend for the higher substitution contents.
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Effect of Sr and Ti substitutions on optical and photocatalytic properties of Bi<sub>1-<i>x</i></sub> Sr <sub><i>x</i></sub> Fe<sub>1-<i>x</i></sub> Ti <sub><i>x</i></sub> O<sub>3</sub> nanomaterials.
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