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Valence instability and photochemical reaction at surface of strongly correlated MgTi2
12. G. Drera, F. Banfi, F. F. Canova, P. Borghetti, L. Sangaletti, F. Bondino, E. Magnano, J. Huijben, M. Huijben, G. Rijnders, D. H. A. Blank, H. Hilgenkamp, and A. Brinkman, Appl. Phys. Lett. 98, 052907 (2011).
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We have studied surface electronic structure and light illumination effect of spinel-type MgTi2O4 with Ti3+(d 1) electronic configuration. Ti4+ species are found at surfaces of MgTi2O4, which show photo-induced effect similar to the Ti4+-oxide semiconductors with surface depletion layer. MgTi2O4 with the surface Ti4+ states reacts with water for H2 emission, which is largely enhanced by light illumination.
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