Double perovskite conductivity

More recently, the maximum oxygen non-stoichiometry in SMMO was successfully increased through partial substitution of Mo(Vl) by Nb(V), without compromising the stability of the double perovskite [85]. The increase in oxygen non-stoichiometry suggests that more Mo /Mo " redox centers are created, which are expected to increase both oxygen ion conductivity and fuel oxidation rates. 

Ti,Nb)-0, and La-deficient La2-02 layers (Fig. 6.7(a)). Two-dimensional lithium cation conduction has also been reported in the orthorhombic layered perovskite-type compound Lao.62Lio.i6Ti03 [55], in which the Li cation exists and migrates only near the La-deficient La2-02 layer. This work has thus revealed that oxide ion diffusion in an ionic conductor with a double perovskite structure is two dimensional. 

Colomban Ph., Remain F., Neiman A., Animitsa I. Double perovskites with oxygen structural vacancies Raman spectra, conductivity and water uptake.// Solid State Ionics. 2001. V. 145/1-4, p.339-347. 

Bhella S. S., Thangadurai V. Synthesis and characterization of carbon dioxide and boiling water stable proton conducting double perovskite-type metal oxides // Journal of Power Sources 186 (2009) 311-319. 

Double Substitution In such processes, two substitutions take place simultaneously. For example, in perovskite oxides, La may be replaced by Sr at the same time as Co is replaced by Fe to give solid solutions Lai Sr Coi yFey03 5. These materials exhibit mixed ionic and electronic conduction at high temperatures and have been used in a number of applications, including solid oxide fuel cells and oxygen separation. 

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