Spin-state transition of iron in ( perovskite

In-situ X-ray diffraction study of carbonate formation and decomposition in perovskite-type BCFZ

“…Second, we found that the carbonate formation occurs predominantly at the cost of Co/Fe containing component of BCFZ accompaned by development of CoO as by-product. Poor stability of Co-containing perovskite caused by flexible redox behavior of Co-cations was already discussed in some details in ours previous reports [25][26][27]. Furthermore, these results are in good agreement with reports of Yakovlev et al [17] as well as Yi et al [28] suggesting the stabilizing effect of higher valent B-site cation like Zr 4 þ or Nb 5 þ on the Co-, Fe-containing perovskite materials.…”

Investigation of carbonates in oxygen-transporting membrane ceramics

“…The EELS spectrum of the perovskite exhibits peaks attributed to Fe-L 2,3 (710 and 723 eV [27]), Co-L 2,3 (782 and 796 eV) and La-M 4,5 (837 and 854 eV). The O-K electron-loss near edge structure (ELNES) for the LSCF 6482 perovskite is slightly different from the O-K ELNES of SCF (Fig.…”

“…Carbonate is very sensitive to the high-energy electron beam, which can cause decomposition into CO 2 and oxide [27]. To ensure that no carbonate was formed, the cross-section of the sweep side was protected by epoxy due to the sample preparation and is shown in Fig.…”

Flame spray deposition of La0.6Sr0.4CoO3−δ thin films: Microstructural characterization, electrochemical performance and degradation

“…Particularly for the YSZ/LSM system, the reduced performance is assigned mainly to the surface-dominated oxygen transfer kinetics of the purely electronic conducting LSM cathode [5]. Therefore, alternative materials with mixed ionic-electronic conductivity (MIEC) have been investigated, such as La 1−x Sr x CoO 3−ı (LSC) [6,7], La 1−x Sr x Fe 1−x Co x O 3−ı (LSCF) [8,9], Ba 1−x Sr x Fe 1−x Co x O 3−ı (BSCF) [8,[10][11][12][13][14][15], and Ba 1−x Sr x Fe 1−x Zn x O 3−ı [14,16]. Due to the mixed conductivity, volume diffusion occurs in addition to surface diffusion and accelerates the oxygen transfer kinetics of these MIEC perovskites compared to LSM [5].…”