Defect chemistry and surface oxygen exchange kinetics of La-doped Sr(Ti,Fe)O3 - α in oxygen-rich atmospheres

Nicola H. Perry, Daniele Pergolesi, Sean R. Bishop, Harry L. Tuller

    研究成果: Contribution to journalArticle査読

    19 被引用数 (Scopus)

    抄録

    Abstract The mixed ionic and electronic conductor Sr(Ti,Fe)O3-α (STF) exhibits fast oxygen surface exchange kinetics, with electron concentration potentially playing a key role. The effect of La donor doping on electron concentration, Fermi level, and overall defect chemistry of STF is investigated on Sr1-yLayTi0.65Fe0.35O3-α (LSTF, 0 ≤ y ≤ 0.5) thin films. Defect chemical modeling, optical absorption, and electrical conductivity measurements in oxidizing conditions indicate compensation of donors by an increase in oxygen and electron concentrations, increase in Fermi level, decrease in oxygen vacancy and hole concentrations, and formation of cation vacancies (for [La] > [Fe]). The surface exchange coefficient, measured by impedance spectroscopy, decreased with increasing donor concentration, suggesting that oxygen exchange kinetics in LSTF are limited by low oxygen vacancy and/or hole concentrations, rather than electron transfer.

    本文言語英語
    論文番号13457
    ページ(範囲)18-24
    ページ数7
    ジャーナルSolid State Ionics
    273
    DOI
    出版ステータス出版済み - 5 1 2015

    All Science Journal Classification (ASJC) codes

    • 化学 (全般)
    • 材料科学(全般)
    • 凝縮系物理学

    フィンガープリント

    「Defect chemistry and surface oxygen exchange kinetics of La-doped Sr(Ti,Fe)O<sub>3 - α</sub> in oxygen-rich atmospheres」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル