首页 | 本学科首页   官方微博 | 高级检索  
     


Study of the oxygen incorporation and diffusion in Sr(Ti0.65Fe0.35)O3 ceramics
Authors:Christos Argirusis,Francois JomardStefan F. Wagner,Wolfgang MenesklouEllen Ivers-Tiffé  e
Affiliation:
  • a School of Chemical Engineering, National Technical University of Athens, Iroon Polytechneiou 9, Zografou 157 80, Athens, Greece
  • b Institut für Metallurgie, Technische Universität Clausthal, Robert-Koch-Str. 32, 38678 Clausthal-Zell., Germany
  • c GEMaC, UMR 8635/CNRS Université de Versailles-Saint-Quentin, 1, place A. Briand, 92195 Meudon Cedex France
  • d Institut für Werkstoffe der Elektrotechnik, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
  • Abstract:For applications in high temperature fast conductometric gas sensors and oxygen membranes, several mixed conductors show promising features. In particular, acceptor-doped strontium titanate (STO) has been widely investigated for an application as a fast conductometric oxygen sensor. By a B-site substitution with 35% iron, the resulting ceramic solid solution SrTi0.65Fe0.35O3 (STF35) exhibits a temperature-independent conductivity, an ideal prerequisite for a gas sensor.In the presented study, the oxygen tracer exchange behavior and the tracer diffusion of dense ceramic STF35 bulks have been investigated in the temperature range between 600 and 900 °C by means of 18O2 tracer exchange experiments and subsequent secondary ion mass spectrometry (SIMS), resulting in the determination of k* and D* values, respectively.Furthermore, by coating the samples with a thin alkaline earth metal oxide layer (CaO), a significantly enhanced oxygen surface exchange reaction was observed. These findings are in good agreement with previous results on STO single crystals.
    Keywords:Strontium titanate   Resistive-type oxygen sensor   Kinetics   Surface transfer
    本文献已被 ScienceDirect 等数据库收录!
    设为首页 | 免责声明 | 关于勤云 | 加入收藏

    Copyright©北京勤云科技发展有限公司  京ICP备09084417号