X-Ray Photoelectron Spectroscopy of BaTiO3 Mesocrystals

Yuji ADACHI, Syozo TAKADA, Shigemi KOHIKI*, Akihiko SHIMIZU, Masaoki OKU and Masanori MITOME††

Department of Materials Science, Faculty of Engineering, Kyusyu Institute of Technology;Tobata-ku, Kita-kyusyu-shi 804-8550 Japan
Institute for Material Research, Tohoku University; Aoba-ku, Sendai-shi 980-8577 Japan
†† National Institute for Research in Inorganic Materials; Tsukuba-shi 305-0044 Japan

Mesocrystals of BaTiO3 were fabricated by soaking a molecular sieve to precursor solutions with various concentrations and calcination in flowing oxygen at 700°C. Chemical shifts of the Ti 2p3/2 electron binding energy 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 shift of the Ba 3d5/2 electron binding energy was 2.9 eV for the mesocrystals from any precursor solutions. X-Ray photoelectron spectroscopy revealed that less interpore electronic relaxation between the filled pores with BaTiO3 mesocrystals brings about larger blue shift of the optical absorption edge for diluted systems.

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