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Synthesis, crystal structure refinement, and ionic transport properties of lantanum silicate with apatite structure

Kobayashi, Kiyoshi*; Yoshida, Akira*; Matsushita, Yoshitaka*; Nishimura, Chikashi*; Oyama, Yukiko*; Miyoshi, Shogo*; Izumi, Fujio*; Igawa, Naoki   ; Yamaguchi, Shu*

Conduction properties of oxide ions and crystal structure refinement of La$$_{9.50}$$(SiO$$_{4}$$)$$_{6}$$O$$_{2.25}$$ have been made by A.C.-impedance, electro-motive force of oxygen concentration cell, X-ray and neutron diffraction methods using the sample fabricated by the sol-gel method. The crystal structure of the sample can be refined by structural model with ${it P}$6$$_{3}$$/${it m}$ space group. Oxide ion conductivity is found to be predominant in wide oxygen partial pressure and temperature range based on the conductivity and electro-motive force measurements.

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