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Issue 47, 2010
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Thermodynamics of solid electrolytes and related oxide ceramics based on the fluorite structure

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Abstract

Oxides based on the fluorite structure are important as electrolytes in solid oxide fuel cells, thermal barrier coatings, gate dielectrics, catalysts, and nuclear materials. Though the parent fluorite structure is simple, the substitution of trivalent for tetravalent cations, coupled with the presence of charge-balancing oxygen vacancies, leads to a wealth of short-range and long-range ordered structures and complex thermodynamic properties. The location of vacancies and the nature of clusters affect the energetics of mixing in rare earth doped zirconia, hafnia, ceria, urania, and thoria, with systematic trends in energetics as a function of cation radius. High temperature oxide melt solution calorimetry has provided direct measurement of formation enthalpies of these refractory materials. Surface and interfacial energies have also been measured in yttria stabilized zirconia (YSZ) nanomaterials. Other ionic conductors having perovskite, apatite, and mellilite structures are discussed briefly.

Graphical abstract: Thermodynamics of solid electrolytes and related oxide ceramics based on the fluorite structure

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Publication details

The article was received on 19 May 2010, accepted on 30 Jul 2010 and first published on 27 Aug 2010


Article type: Feature Article
DOI: 10.1039/C0JM01521K
Citation: J. Mater. Chem., 2010,20, 10577-10587
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    Thermodynamics of solid electrolytes and related oxide ceramics based on the fluorite structure

    A. Navrotsky, J. Mater. Chem., 2010, 20, 10577
    DOI: 10.1039/C0JM01521K

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