Construction of Chemical Potential Diagrams for Metal‐Metal‐Nonmetal Systems: Applications to the Decomposition of Double Oxides

Harumi Yokokawa, Tatsuya Kawada, Masayuki Dokiya

Research output: Contribution to journalArticlepeer-review

66 Citations (Scopus)

Abstract

A chemical potential diagram for A‐B‐O (A, B = metallic elements) systems has been constructed to make visually clear the thermodynamic stability of double oxides; the stability area of metallic elements, their binary oxides, and double oxides can be presented as convex polygons in a log (aA/aB) vs log P(O2) plot, a and P(O2) being the activity of metallic elements and the oxygen partial pressure, respectively; the axis variable, log (aA/aB), is used to treat two metallic elements equivalently. The Co‐Ti‐O and La‐Co‐O systems have been chosen as examples to demonstrate how the present diagram can provide complicated phase relations in a compact and visualized manner. An attempt has also been made to utilize this diagram to present graphically products of kinetic decomposition of double oxides placed in an oxygen potential gradient.

Original languageEnglish
Pages (from-to)2104-2110
Number of pages7
JournalJournal of the American Ceramic Society
Volume72
Issue number11
DOIs
Publication statusPublished - 1989 Nov
Externally publishedYes

Keywords

  • cobalt
  • decomposition
  • molding
  • phases
  • titanium

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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