The diffuse reflection spectra and the p~t~lectr~h~~l properties of TiNb20;1 and TiTa2~ are reported. Both compounds show an optical absorption edge near 3.0 eV.TiNb207 can be used as photoanode in a photwlectrochemical cell. 'Ibe onset potential of the photocurrent is about -0.9 V 2 SCE in 1M NaOH. TITa207 appears to be unstable in this electrolyte.
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