Structural characterisation of the potential SOFC cathode materials, La2-xSrxCoO4+∂ (0 ≤ x ≤ 1.0)

摘要: Recently mixed conducting K 2 NiF 4 -type materials containing interstitial oxygen, such as La Ni 1-x Co x O 4+ ∂ have been attracting attention potential solid oxide fuel cell cathode materials. In this paper, we report a detailed structural investigation of the related system, 2-x Sr CoO (0 ≤ S 1), to examine how structure and oxygen content varies with content. The results show that for 0.2 ≤1, system adopts tetragonal 14/mmm cell, while 0.1, becomes orthorhombic, space group Abma. For samples high contents (x > 0.5), there is no evidence any consequently oxidation state decreases from 3+ 2.6+ in range. lower contents, level increases decreasing content, remains approximately constant (≃2.6+) range, 0 0.5. are discussed comparison literature conductivity data.