Chemical Diffusivity and Defect Chemistry of BaTiO3-δ

  • YOO Han-Ill
    Solid State Ionics Research Laboratory, School of Materials Science and Engineering, Seoul National University
  • SONG Chang-Rock
    Solid State Ionics Research Laboratory, School of Materials Science and Engineering, Seoul National University

書誌事項

タイトル別名
  • Chemical Diffusivity and Defect Chemistry of BaTiO<sub>3−δ</sub>
  • Chemical Diffusivity and Defect Chemistry of BaTiO3 デルタ

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説明

<p>Chemical diffusion coefficient of BaTiO3−δ was determined by a conductivity relaxation technique as afunction of oxygen partial pressure in the widest ever range of 10−15≤Po2/atm≤1 including an n/p mixed regime, at elevated temperatures of 800≤T/°C≤1100. The chemical diffusivity varies convex-upwardly in the range of 10−5≤ <img align="middle" src="./Graphics/abst-68_415.png"/>/cm2 s−1 < 10−2 at al1 temperatures and its maximum falls approximately at the oxygen partial pressure where n-to-p transition occurs or δ≈0. This behavior of <img align="middle" src="./Graphics/abst-68_415.png"/> is analyzed on the basis of C. Wagner's classic theory of chemical diffusion in association with the defect structure of BaTiO3−δ. The measured total conductivity and chemical diffusivity combined leads, without using any assumptions, to the evaluation of the defect chemical parameters including carrier mobi1ities and defect equilibrium constants, and further to an insight into the nature of the inherent acceptors of “undoped’’ Ba-TiO3−δ.</p>

収録刊行物

  • Electrochemistry

    Electrochemistry 68 (6), 415-422, 2000-06-05

    公益社団法人 電気化学会

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