Crystal Structure and Proton Conductivity of BaZr 0.9 Sc 0.1 O 3−δ

Solid‐state sintering has been used to prepare the perovskite BaZr 0.9 Sc 0.1 O 3−δ . Analysis of X‐ray powder diffraction data shows that an increase of the unit cell parameter, a , was observed after deuteration. Rietveld analysis of room‐temperature neutron powder diffraction data confirmed cubic symmetry (space group Pm‐ 3 m ). Dynamic thermogravimetric analysis indicates that the hydration process occurs below 335°C and approximately 58% of the theoretical number of protonic defects can be filled. The presence of protons/deutrons is seen from the strong O–H/O–D stretch band in the infrared spectrum of the hydrated/deuterated samples. The proton conductivity of a prehydrated sample was investigated under dry and wet Ar atmospheres.