Synthesis and structures of carrier doped titanates with the Ruddlesden-Popper structure (Sr0.95La0.05)n+1TinO3n+1 (n = 1, 2)

Wataru Sugimoto, Masashi Shirata, Masataka Takemoto, Shuhei Hayami, Yoshiyuki Sugahara, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Carrier doping in Srn+1TinO3n+1 (n = 1, 2) was conducted by the substitution of La for Sr and the simultaneous introduction of oxygen vacancies. Single-phase products of (Sr0.95La0.05)n+1TinO 3n+1-δ (n = 1, δ = 0.05; n =2, δ = 0.125) were synthesized by the solid-state reaction of Sr2TiO4 (or Sr3Ti2O7), La2O3 and Ti. When TiO2 was used as one of the starting compounds to maintain oxygen stoichiometry, compounds with higher n were observed besides the object phases. Structural refinement by Rietveld analysis revealed that the a-axis expands while the c-axis contracts with La doping. The contraction of the c-axis is attributed to a shortened (Sr,La)-O distance, since the TiO6 octahedra elongated in both a and c directions with doping. The change in the structure is discussed on the basis of the size of the substituting ion. The resistivity of the single-phase products was semiconducting with a very weak temperature dependence down to 80 K.

    Original languageEnglish
    Pages (from-to)315-319
    Number of pages5
    JournalSolid State Ionics
    Volume108
    Issue number1-4
    Publication statusPublished - 1998 May 1

    Fingerprint

    titanates
    Doping (additives)
    synthesis
    Oxygen Compounds
    Rietveld analysis
    oxygen
    Oxygen vacancies
    products
    Solid state reactions
    Stoichiometry
    contraction
    stoichiometry
    Substitution reactions
    Ions
    substitutes
    solid state
    temperature dependence
    electrical resistivity
    Oxygen
    ions

    Keywords

    • Electrical properties
    • Rietveld method
    • Solid-state reaction
    • Titanates

    ASJC Scopus subject areas

    • Electrochemistry
    • Physical and Theoretical Chemistry
    • Energy Engineering and Power Technology
    • Materials Chemistry
    • Condensed Matter Physics

    Cite this

    Synthesis and structures of carrier doped titanates with the Ruddlesden-Popper structure (Sr0.95La0.05)n+1TinO3n+1 (n = 1, 2). / Sugimoto, Wataru; Shirata, Masashi; Takemoto, Masataka; Hayami, Shuhei; Sugahara, Yoshiyuki; Kuroda, Kazuyuki.

    In: Solid State Ionics, Vol. 108, No. 1-4, 01.05.1998, p. 315-319.

    Research output: Contribution to journalArticle

    Sugimoto, Wataru ; Shirata, Masashi ; Takemoto, Masataka ; Hayami, Shuhei ; Sugahara, Yoshiyuki ; Kuroda, Kazuyuki. / Synthesis and structures of carrier doped titanates with the Ruddlesden-Popper structure (Sr0.95La0.05)n+1TinO3n+1 (n = 1, 2). In: Solid State Ionics. 1998 ; Vol. 108, No. 1-4. pp. 315-319.
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    abstract = "Carrier doping in Srn+1TinO3n+1 (n = 1, 2) was conducted by the substitution of La for Sr and the simultaneous introduction of oxygen vacancies. Single-phase products of (Sr0.95La0.05)n+1TinO 3n+1-δ (n = 1, δ = 0.05; n =2, δ = 0.125) were synthesized by the solid-state reaction of Sr2TiO4 (or Sr3Ti2O7), La2O3 and Ti. When TiO2 was used as one of the starting compounds to maintain oxygen stoichiometry, compounds with higher n were observed besides the object phases. Structural refinement by Rietveld analysis revealed that the a-axis expands while the c-axis contracts with La doping. The contraction of the c-axis is attributed to a shortened (Sr,La)-O distance, since the TiO6 octahedra elongated in both a and c directions with doping. The change in the structure is discussed on the basis of the size of the substituting ion. The resistivity of the single-phase products was semiconducting with a very weak temperature dependence down to 80 K.",
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    AU - Shirata, Masashi

    AU - Takemoto, Masataka

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    AU - Kuroda, Kazuyuki

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