Abstract
The replacement of tantalum by the couple Zr/W within the RTa–O–N systems (R = Y, Nd, Sm, Gd, Yb), enables the preparation of novel oxide and oxynitride phases in the R–Zr–W–O–N system. R 2Zr 2− x W x O 7+ x oxides exhibit the fluorite-type ( x < 0.9) and scheelite ( x ∼ 1) structures. Corresponding oxynitride compositions are of the fluorite-type and show different colors, for example in the case of ytterbium: pale yellow ( x = 0.2 or 0.25), green ( x = 0.5–0.8) and brown for the tungsten-rich samples ( x = 0.9, 1). Photocatalytic activity measurements have been performed to investigate the overall water splitting behavior of these colored phases.
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