Phase equilibria of the zinc oxide-cobalt oxide system in air

Nicola H. Perry, Thomas O. Mason

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Phase equilibria of the zinc oxide-cobalt oxide system were studied by a combination of X-ray diffraction and in situ electrical conductivity and thermopower measurements of bulk ceramic specimens up to 1000°C in air. Rietveld refinement of X-ray diffraction patterns demonstrated increasing solubility of Co in ZnO with increasing temperature, which is supported by the slight increase in wurtzite (Zn1-xCoxO) cell volume and lattice parameter a versus temperature determined for the phase boundary compositions. Similarly, the solubility of Zn in CoO increased with increasing temperature. In contrast, the spinel phase (ZnzCo3-zO 4) exhibited retrograde solubility for Zn. Electrical measurements showed that the eutectoid temperature for transformation of rocksalt Co 1-yZnyO into wurtzite and spinel is 894 ± 3°C, and the upper temperature limit of the stability of the spinel phase is 894°C-898°C for the compositions Co/(Zn+Co) = 0.82-1. The resulting composition-temperature phase diagram is presented and compared to the earlier (1955) diagram by Robin.

Original languageEnglish
Pages (from-to)966-971
Number of pages6
JournalJournal of the American Ceramic Society
Volume96
Issue number3
DOIs
Publication statusPublished - Mar 1 2013

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Zinc Oxide
Zinc oxide
Phase equilibria
Cobalt
Oxides
Air
Solubility
Temperature
Chemical analysis
X ray diffraction
Rietveld refinement
Thermoelectric power
Phase boundaries
Diffraction patterns
Lattice constants
Phase diagrams
cobalt oxide
spinell

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Phase equilibria of the zinc oxide-cobalt oxide system in air. / Perry, Nicola H.; Mason, Thomas O.

In: Journal of the American Ceramic Society, Vol. 96, No. 3, 01.03.2013, p. 966-971.

Research output: Contribution to journalArticle

Perry, Nicola H. ; Mason, Thomas O. / Phase equilibria of the zinc oxide-cobalt oxide system in air. In: Journal of the American Ceramic Society. 2013 ; Vol. 96, No. 3. pp. 966-971.
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