Due to the mixed conduction, a formally neutral species can transport in a solid and therefore mass storage and redistribution are enabled. Oxides with fluorite structure (ZrO 2, ThO 2, CeO 2) doped with CaO, MgO, Y 2O3, Sc 2O3 and La 2O3 Y2O3 ZrO 2 2Y, Ce + 3O x O + V •••••••• O Fluorite structure (CaF 2-type) Zr O Abstract Oxide ion conductivity in doped NdBaInO 4 with new type oxygen deficient perovskite was studied and it was found that doping Ti to In site is effective for increasing the oxide ion conductivity. The bismuth-based electrolytes unfortunately suffer from instability under reducing conditions, which is a limitation for some applications, such as in the solid oxide fuel cells discussed below. One of the best oxide-ion electrolyte is (CeO 2 ) 0.8 (Sm 2 O 3 ) 0.2 , which has a conductivity value of about 0.3 Ω −1 cm −1 at 1273 K and an activation energy of 0.83 eV [11]. So these oxide material which can be formed oxygen vacancy are promising candidate material for oxide ion conductors, for example, the fluorite structure zirconium, cerium, bismuth oxide, bismuth vanadium oxide can be on the promising candidates for oxide ion conductors. DOI: 10.1039/C8DT01024B. So oxide ion conductivity is related with the oxygen vacancies. A new structure family of oxide-ion conductors Ca 0.8 Y 2.4 Sn 0.8 O 6 discovered by a combined technique of the bond-valence method and experiments. German researchers have found an unusual compound that is the first metallic oxygen ion conductor of its kind, as well as … Dalton Transactions 2018, 47 (22) , 7515-7521. Many researchers have investigated the optical, electrical, and magnetic properties of CaFe2O4-type materials, but the CaFe2O4-type pure oxide-ion conductors have not been reported yet. Among these, ceria-based oxide-ion electrolytes are more readily reducible and hence exhibit an electronic conductivity component at low partial pressures of oxygen. Oxygen Ion Conductors Solid oxide fuel cells (SOFCs) are one type of fuel cell whose performance is strongly dependent on the ability of oxygen ions to migrate through an ion … Fuel cells for decentralized energy production require oxygen ion conductors: materials that can store oxygen as ions, and then transport and release it. The copper-substituted compound has an oxide ion conductivity above 200 ∘ C which is ≈ 2 orders of magnitude higher than other oxide ion conductors. Oxide ion conductors find important technical applications in electrochemical devices such as solid-oxide fuel cells (SOFCs), oxygen separation membranes and sensors. Mixed conductors, also known as mixed ion-electron conductors (MIEC), are a single-phase material that has significant conduction ionically and electronically. Extrinsic ionic conductors 1/T Log σ Doping intrinsic extrinsic Conductivity increase by a doping. – oxide ion conductor Applications of stabilized zirconia Oxide conductors are of use for – oxygen sensors » based on concentration cell, can be used to measure O2 in exhaust gases, molten metals … – fuel cell membranes ZrO2 is only usable at high temperatures