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The SOEC basically can be thought as a SOFC, working in reverse mode [5]. Therefore, many materials currently studied as potential candidates for SOFC cathode can also be used as anodes in the SOEC.While the solid oxide cell are efficient systems for energy conversion and production of [H.sub.2], the oxygen separation membranes are oxides ceramics with selectivity for the oxygen diffusion allowing the control of oxygen partial pressure in reactivity chambers for selective oxidation of hydrocarbons [3]. Particularly, mixed conductors with high oxide-ion conductivity can be used as oxygen separation membranes without the use of electrodes and external circuit required for a traditional ceramic oxygen pump.Materials selection for these high temperature electrochemical devices involves an iterative design process that eventually becomes specific to the technical requirements and economic considerations. By one hand, in SOCs the critical parameters to the efficiency and operation are the voltages loss associated to ohmic drop in electrolyte and overpotentials on electrodes. By other hand, in oxygen separation membranes the critical issue is the stability of the ceramic membranes in both oxidant and reducing atmospheres. Besides, long term stability is required for both electrochemical devices due to the high working temperature. Therefore, thermodynamic and structural stability, along with chemical compatibility and zero thermal stress should be assured for the materials.Sebagian besar konduktor campuran untuk digunakan sebagai calon untuk oksigen elektroda SOCs suhu menengah dan membran pemisahan oksigen logam transisi oksida dengan perovskite atau struktur kristal perovskite yang berhubungan dengan memamerkan oksigen bebas-stoikiometri. Konduktivitas elektronik campuran konduktor terutama terkait dengan valensi campuran logam-logam transisi sedangkan konduktivitas ionik karena adanya oksigen seluler Lowongan pada suhu tinggi.Tampaknya jelas bahwa reaksi elektroda dalam oksigen elektroda dan transportasi oksigen di keramik membran harus berhubungan dengan struktur cacat dari logam transisi oksida.Analisis termal melibatkan teknik yang kuat memungkinkan evaluasi struktur Cacat [10-14] dan transformasi struktural [15, 16] bebas-stoikiometri oksida digunakan dalam kombinasi dengan data yang Diperoleh dari suhu tinggi XRD. Juga dimungkinkan untuk studi, melalui analisis termal, sifat termodinamika, dan stabilitas kimia beragam sistem [17, 18].
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