The two alkaline earth niobates Sr2Nb2O7 and Ba0.5Sr0.5Nb2O6 have been prepared, their electronic properties measured, and their photoresponses compared. The indirect band gap in Sr2Nb2O7 is 3.86 eV compared with 3.38 eV for Ba0.5Sr0.5Nb2O6. Hence, photoanodes composed of Sr2Nb2O7 respond to much less of the "white" light spectrum than those made from Ba0.5Sr0.5Nb2O6. Nevertheless, their electrical outputs at an anode potential of 0.8 eV with respect to SCE in 0.2 M sodium acetate under "white" xenon arc irradiation of 1.25 W/cm2 are comparable.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry