X-ray photoelectron spectroscopy of BaTiO3 mesocrystals

Mesocrystals of BaTiO3 were fabricated by soaking a molecular sieve to prec ursor solutions with various concentrations and calcination in flowing oxyg en at 700 degrees C. Chemical shifts of the Ti 2p(3/2) electron binding ene rgy were 0.6, 1.4 and 1.8 eV for the BaTiO3 mesocrystals from the precursor solutions of 0.1, 0.04 and 0.004 mol/L, respectively, while the chemical s hift of the Ba 3d(5/2) electron binding energy was 2.9 eV for the mesocryst als from any precursor solutions. X-Ray photoelectron spectroscopy revealed that less interpore electronic relaxation between the filled pores with Ba TiO3 mesocrystals brings about larger blue shift of the optical absorption edge for diluted systems.