Higherature protonic conduction in LaBO3 substituted with alkaline earth elements

Naoto Kitamura, Koji Amezawa, Nobuyuki Takahashi, Jun Ichi Yamada, Teiichi Hanada, Naoya Ishida, Yasushi Idemoto

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)


    Electrical conduction properties of the aragonite-type LaBO3-based materials, in which La was substituted partially by Ca, Sr and Ba, were investigated at 500925°C with conductivity and transport-number measurements. From X-ray diffraction measurements, it was confirmed that a solubility limit of Sr to the La site is between 1 and 2 mol%. When the substitution content exceeded the solubility limit, the conductivities decreased with increasing the concentration. Such a deterioration in the conductivity was considered to be resulted from an impurity-phase formation. Regardless of substitution species, the LaBO3 exhibited predominant protonic conduction by the partial substitution of the alkaline earth elements for La, and the Sr-substituted sample showed the highest conductivities. The proton transport numbers were estimated as 0.70.9 from electromotive forces of watervapor and oxygen concentration cells.

    Original languageEnglish
    Pages (from-to)253-256
    Number of pages4
    JournalJournal of the Ceramic Society of Japan
    Issue number1436
    Publication statusPublished - 2015 Apr 1


    • Borate
    • Defect
    • Higherature protonic conduction

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry


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