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Report No.

Protonic conduction, crystal and electronic structures of La$$_{0.9}$$Ba$$_{1.1}$$Ga$$_{0.95}$$Mg$$_{0.05}$$O$$_{4-delta}$$

Hamao, Naoki*; Kitamura, Naoto*; Ito, Takanori*; Igawa, Naoki   ; Idemoto, Yasushi*; Daido, Hiroyuki; Kaku, Masanori*; Kubodera, Masakazu*

La$$_{0.9}$$Ba$$_{1.1}$$Ga$$_{0.95}$$Mg$$_{0.05}$$O$$_{4-delta}$$ which is one of the candidates for solid electrolyte of solid oxide fuel cell was synthesized by means of a conventional solid-state reaction, and investigated by conductivity measurements, the Rietveld and maximum entropy method analyses using neutron and synchrotron X-ray diffraction data. Conductivity measurements indicated that simultaneous Ba and Mg substitutions for LaBaGaO$$_{4}$$ were effective way to improve the protonic conductivity. From the Rietveld and maximum entropy method analyses, it was confirmed that La$$_{0.9}$$Ba$$_{1.1}$$Ga$$_{0.95}$$Mg$$_{0.05}$$O$$_{4-delta}$$ kept the same crystal structure as LaBaGaO$$_{4}$$ even at elevated temperature, i.e. 1000 K, and that protons existed around the O3 site and formed hydrogen bonds. It is also found that oxygens in LaBaGaO$$_{4}$$-based samples formed Ga-O$$_{4}$$ tetrahedra, and the bonding strength was varied by the partial substitutions.



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Category:Chemistry, Physical



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