Proton distribution in proton conductor for fuel cell by in-situ neutron diffraction

Igawa, Naoki   ; Nagasaki, Takanori*; Taguchi, Tomitsugu; Hoshikawa, Akinori*; Ishigaki, Toru*; Morii, Yukio*; Hayashi, Makoto*

The temperature dependence of crystal structure of proton conductor, BaSnInO was analyzed in the temperature range from 10 to 790 K by in-situ neutron diffraction. We found that the crystal structure of the sample is cubic perovskite-type structure with the space group of -3. Atomic displacement parameters of each atom were relatively large even at 10 K and those were increasing with the temperature. Those phenomena indicate the crystal structure had local static/dynamic disorders which influence the proton diffusion.