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    Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3

    Access Status
    Fulltext not available
    Authors
    Ni, W.
    Ye, J.
    Guo, Y.
    Cheng, C.
    Lin, Z.
    Li, Y.
    Wang, H.
    Yu, Y.
    Li, Q.
    Huang, S.
    Shao, Zongping
    Wang, C.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Ni, W. and Ye, J. and Guo, Y. and Cheng, C. and Lin, Z. and Li, Y. and Wang, H. et al. 2017. Decisive role of mixed-valence structure in colossal dielectric constant of LaFeO3. Journal of the American Ceramic Society. 100 (7): pp. 3042-3049.
    Source Title
    Journal of the American Ceramic Society
    DOI
    10.1111/jace.14860
    ISSN
    0002-7820
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/57000
    Collection
    • Curtin Research Publications
    Abstract

    The role of mixed-valence structure in colossal dielectric constant (CDC) behavior has been investigated in LaFeO 3 ceramics by tuning the ratio of Fe 2+ /Fe 3+ through substituting Al for Fe. The ratio of Fe 2+ /Fe 3+ is decreased gradually from 1.0 to 0.0 by increasing the concentration of Al 3+ . Two clear-cut correlations have been found: (i) the relationship between the CDC behavior and the ratio of Fe 2+ /Fe 3+ follows an exponential function and (ii) the activation energy of the polaron relaxation is proportional to 1/? 2 0 , where ? 0 is the intrinsic dielectric constant. These findings underscore the role of the mixed-valence structure in CDC behavior and suggest that adjusting the mixed-valence structure through doping/alloying can be a promising strategy to achieve superior CDC behavior in transition-metal oxides.

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