La[Fe(CN)_6]・4H_2Oの熱分解法により得られたLaFeO_3の焼成雰囲気が表面構造と電気的性質に及ぼす影響

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Perovskite-type LaFeO_3 powders were prepared by thermal decomposition of a heteronuclear complex, La[Fe(CN)_6]・4H_2O at 700℃. Powders were deposited as thick films on alumina substrates with comb-type Au electrodes and then sintered in nitrogen or air atmosphere. The surface chemical analysis was performed using X-ray photoelectron spectroscopy (XPS). The O1s XPS line was separated in two peaks attributed to adsorbed oxygen (O_<ad>) and oxygen in the lattice (O_<lattice>) on the surface. The ratio [O_<ad>+O_<lattice>]/[La+Fe] was uninfluenced by the ambient during sintering. The [O_<lattice>]/[La+Fe] atomic ratio decreased and [O_<ad>]/[La+Fe] value increased upon sintering in N_2 atmosphere, as compared with samples sintered in air. It was argued that O_<ad> sites act as adsorption sites for nitrogen dioxide. The increase in O_<ad> sites is effective for enhancing electrical conductivity in nitrogen dioxide.
社団法人日本セラミックス協会の論文
2000-10-01