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

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.
Authors:
 [1]
  1. Univ. of California, Davis, CA (United States). Nanomaterials in the Environment, Agriculture, and Technology Organized Research Unit (NEAT ORU) and Peter A. Rock Thermochemistry Lab.
Publication Date:
OSTI Identifier:
1066001
DOE Contract Number:
SC0001089
Resource Type:
Journal Article
Resource Relation:
Journal Name: JOURNAL OF MATERIALS CHEMISTRY; Journal Volume: 20; Journal Issue: 47; Related Information: MSA partners with University of Notre Dame (lead); University of California, Davis; Florida State University; George Washington University; University of Michigan; University of Minnesota; Oak Ridge National Laboratory; Oregon state University; Rensselaer Polytechnic Institute; Savannah River National Laboratory
Publisher:
Royal Society of Chemistry
Research Org:
Energy Frontier Research Centers (EFRC); Materials Science of Actinides (MSA)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE nuclear (including radiation effects), materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly)