Kinetic Process of Reoxidation of Base Metal Technology BaTiO 3-Based Multilayer Capacitors

Mathew R. Opitz, Knuth Albertsen, James J. Beeson, Detlev F. Hennings, Jules L. Routbort, Clive A. Randall

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Base metal technology, mainly using Ni electrodes in multilayer ceramic capacitors (MLCCs), is now well established. This technology requires a so-called reoxidation treatment after sintering the MLCCs in a reducing atmosphere to guarantee a sufficient electrical reliability. Large numbers of electrodes, and production of physically larger components for high-voltage components, are two technological trends that make the control of the reoxidation process rather difficult. The reoxidation process has been studied to determine oxygen diffusion pathways into commercial MLCCs, using 18O tracer diffusion and finite element calculations. In MLCCs oxygen diffusion mainly occurs along the Ni electrodes. Furthermore, the reoxidation process is mostly controlled by the thermodynamic potential of the Ni/NiO equilibrium in the interior of the capacitor, but it is the short circuit diffusion along the interface of the electrode that controls the kinetics of the oxygen transport into the interior of the capacitor device.

Original languageEnglish (US)
Pages (from-to)1879-1884
Number of pages6
JournalJournal of the American Ceramic Society
Volume86
Issue number11
DOIs
StatePublished - Jan 1 2003

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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