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Investigation of MIEC Materials using an Amperometric Oxygen Titration Method

机译:使用电流滴定法研究MIEC材料

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摘要

For any mixed ionic-electronic conducting (MIEC) oxide an assessment of its basic material properties should include chemical stability as a function of oxygen partial pressure pO_2. However, the stability range is not always easily experimentally accessible. Using a closed tubular zirconia "oxygen pump" setup with platinum electrodes facilitates precise control of the oxygen partial pressure in the enclosed volume within the whole pO_2 range between 10~(-20) … 1 bar at temperatures above 700 ℃. By measuring the electric current necessary for pumping oxygen into or out of the sample chamber, the amount of oxygen transported can be determined with a high precision. In this way, the oxygen uptake or release of an oxide powder sample is determined as a function of pO_2, temperature and time, yielding information on stoichiometry changes and the stability limits of an MIEC oxide.
机译:对于任何混合的离子电子导电(MIEC)氧化物,对其基本材料性能的评估应包括作为氧分压pO_2的函数的化学稳定性。但是,稳定性范围并不总是容易通过实验获得。在700℃以上的温度下,使用带有铂电极的封闭式管状氧化锆“氧气泵”装置可在10o(-20)…1 bar的整个pO_2范围内精确控制封闭体积中的氧气分压。通过测量将氧气泵入或泵出样品室所需的电流,可以高精度确定所输送的氧气量。以此方式,确定氧化物粉末样品的吸氧量或释放量与pO_2,温度和时间的函数关系,得出有关化学计量比变化和MIEC氧化物稳定性极限的信息。

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  • 来源
  • 会议地点 Seattle WA(US);Seattle WA(US)
  • 作者单位

    Institut fuer Werkstoffe der Elektrotechnik (IWE), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe/Germany;

    Institut fuer Werkstoffe der Elektrotechnik (IWE), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe/Germany;

    Institut fuer Werkstoffe der Elektrotechnik (IWE), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe/Germany;

    Institut fuer Werkstoffe der Elektrotechnik (IWE), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe/Germany;

    Institut fuer Werkstoffe der Elektrotechnik (IWE), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe/Germany,DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe/Germany;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 独立电源技术(直接发电);独立电源技术(直接发电);
  • 关键词

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