2017 Volume 46 Issue 8 Pages 1083-1085
We investigated the structural and optical properties of (A0.6X)Bi4(Nb0.6W0.4)O8X (A = K, Rb, Cs and X = Cl, Br). We found that these Sillén–Aurivillius-related oxyhalides have band gaps of ca. 3.1 eV (X = Cl) and ca. 2.8 eV (X = Br), which are surprisingly larger than 2.4 eV for the archetypal Bi4NbO8Cl, meaning a substantial stabilization of O-2p orbitals upon A0.6X layer insertion. The present study suggests versatile possibilities of band gap engineering in Sillén–Aurivillius type compounds.
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