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 language | English |
|---|---|
| Pages (from-to) | 966-971 |
| Number of pages | 6 |
| Journal | Journal of the American Ceramic Society |
| Volume | 96 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 1 2013 |
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All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Materials Chemistry
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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 journal › Article
}
TY - JOUR
T1 - Phase equilibria of the zinc oxide-cobalt oxide system in air
AU - Perry, Nicola H.
AU - Mason, Thomas O.
PY - 2013/3/1
Y1 - 2013/3/1
N2 - 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.
AB - 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.
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U2 - 10.1111/jace.12103
DO - 10.1111/jace.12103
M3 - Article
AN - SCOPUS:84875235347
VL - 96
SP - 966
EP - 971
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 3
ER -