Effects of spin entropy and lattice strain from mixed-trivalent Fe<sup>3+</sup>/Cr<sup>3+</sup>on the electronic, thermoelectric and optical properties of delafossite CuFe<sub>1_<i>x</i></sub>Cr<sub><i>x</i></sub>O<sub>2</sub>(<i>x</i> = 0.25, 0.5, 0.75)
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