Oxide Ion Conductivity in Perovskite Oxides

4 LaGaOs-Based Oxide Doped with Sr and Mg (LSGM) as a New Oxide Ion Conductor 

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Ishihara, T. (2009). Oxide Ion Conductivity in Perovskite Oxide for SOFC Electrolyte in T. Ishihara (ed.) Perovskite Oxide for Solid Oxide Fuel Cells. Springer. London. 65-66. 

Oxide Ion Conductivity in Perovskite Oxide for SOFC Electrolyte... 

Figure 4.14 Arrhenius plots of the oxide ion conductivity in perovskites in air (numbers in figure corresponds to the following materials (1) LaAlO, (2) CaTiOj, (3) SrTiO, (4) Loo.vCao.sAlOs, (5)...

Another class of important materials with oxygen ion conduction are perovskites (see Section 2.4.4). Perovskite phases have been, initially, considered as possible electrode materials for SOFCs. The first report of the existence of oxide conductivity in a perovskite material was made using a calcium-doped lanthanum aluminate [98], But the discovery of attractive oxygen conduction properties is rather recent [84],... 

Ishihara, T. et al.. Oxide ion conductivity in doubly doped PrGaOj perovskite-type oxide, J. Electrochem. Soc., 146, 1643-1649 (1999). 

In the case of perovskite structure, a part of Rare Earths or transition metal is substituted by alkali earth metal. The positive charge for fluorite and perovskite is deficient because of the substitution for the both of fluorite and perovskite. The charge in crystal is kept neutral by the formation of oxygen vacancy for fluorite. And the valence change of transition metal for perovskite keeps the neutral charge in crystal. As a result, the oxide ion conductivity in fluorite structure and the electrical conductivity in perovskite appear. 

Perovskites have two possible roles in these cells. The first of these, as a perovskite-derived proton conducting electrolytes, is described earlier (Section 5.3). In cells that use an oxide ion conducting electrolyte, perovskites are mainly employed as... 

Figure 6.19 shows the temperature dependence of the 0 -ion conductivity in an oxygen-deficient brownmillerite-type perovskite Ba2ln20s that exhibits a first-order order-disorder transition at 930 °C. The Arrhenius plot of 0 -ion conductivity shows that, above T, a considerable short-range order persists nevertheless, the oxide-ion conduction in this field can be competitive with that in the commercial electrolyte yttria-stabilized zirconia (YSZ). 

Browall, K. W., Muller, O., and Doremus, R. H. (1976). Oxygen ion conductivity in oxygen-deficient perovskite-related oxides. Mater. Res. Bull. 11 1473-1482. 

Toda K, Kameo Y, Kurita S, Sato M (1996) Crystal structure determination and ionic conductivity of layered perovskite compounds NaLnTiO (Ln = Rare Earth). J Alloys Compd 234 19-25 Tomchenko AA, Harmer GP, Marquis BT, AUen JW (2003) Semiconducting metal oxide sensor array for the selective detection of combustion gases. Sens Actuators B 93 126-134 Tongpool R, Leach C, Freer R (2000) Temperature and microstructural dependence of the sensitivity of heterocontacts between zinc oxide and copper oxide in reducing environments. 1 Mater Sci Lett 19 119-121 Traqueia LSM, Marques FMB, Kharton VV (2006) Oxygen ion conduction in oxide materials selected examples and basic mechanisms. Bol Soc Esp Ceram 45(3) 115-121... 

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