Influence of rare-earth doping on the microstructure and conductivity of BaCe0.9Ln0.1O3−δ proton conductors

Novel composite solid state electrolytes on the base of BaCeO3 and CeO2 for intermediate temperature electrochemical devices

“…This result is in contradiction with the theoretical ideas concerning the method of SCS, as the analysis of reaction (1) shows that the increase of the x content in this system (using one type of fuel) results in an increase in the number of gaseous substances, which should lead to a more intense dispersion of oxides and to the formation of more fine powders [55]. On the other hand, it is known that an increase in the lattice parameters of the solid solution results in the growth of crystallite size for the submicron materials [64]. Since the size of the perovskite unit cell is greater than fluorite, our patterns with changes in the structure are well described by taking into account the size factor.…”

“…8 [62,76]. The lower values of activation energy of the materials based on barium cerate are, apparently, related with the presence of proton conductivity in humid air, which at relatively low temperatures is the dominant charge carrier of the oxide [64]. The conductivity of the (1 À x)Ce 0.8 Sm 0.2 O 2Àd exBaCe 0.8 Sm 0.2 O 3Àd composite ceramic samples is lower than that of the SDC-3 in the high-temperature region and lower than that of BCS-3 at the lowtemperature region.…”

Effect of Ba-deficiency on the phase and structural stability of (BaSr)(CeZr)O3-based proton conducting oxides

“…For example, the Ba 3d corresponds to simple spectrum (a typical 3d doublet with FWHM of 3.0e3.2 eV) in all compositions with only one contribution and the Ba 3d 5/2 peak shows a maximum at~780 eV [50]. The Sr 3d spectrum matches with a doublet state due to spin-orbit coupling of 3d 5/2 and 3d 3/2 .…”

Effect of fluorine, chlorine and bromine doping on the properties of gadolinium doped barium cerate electrolytes

“…Previous research work shows that among various kinds of HTPC materials, Y-or Gd-doped BaCeO 3 possesses the highest proton conductivity because of the favorable factors associated with the structural features of perovskite materials [16e20]. For example, Amsif and Kikuchi et al [21,22] recently reported that BaCe 0.9 Gd 0.1 O 3 ceramic sample has the highest ionic conductivity among BaCe 0.9 Ln 0.1 O 3 (Ln ¼ La, Nd, Sm, Gd, Yb, Tb) materials due to the optimal combination of lattice distortion and tolerance factor. However, their well-recognized poor chemical stability against CO 2 and H 2 O steam limits their practical applications [23e27].…”