Abstract
Incorporation of the pentavalent W-ion has been investigated in Sr2FeNb1−x W x O6 for 0.0 ≤ x < 0.15. The synthesized double perovskite system was used to study its structural and optical properties. The optical, as well as structural, properties were found to change with the varying Nb:W stoichiometric ratio. The Sr2FeNb1−x W x O6 samples with 0.0 ≤ x 0.1, the Sr2FeNb1−x W x O6 showed no change in the optical properties but crystal structure was drastically affected, exhibiting impurity phases and a disordered structure, thus yielding a degraded photocatalytic behavior. The higher absorption coefficient in the Sr2FeNb0.99W0.01O6 and a higher electron-density acquired by n-type lattice doping seems to be responsible for the better efficient charge separation in Sr2FeNb1−x W x O6 (0.01 ≤ x ≤ 0.20) and consequently the higher photocatalytic activity in co-catalyst loaded photocatalysts.
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