TY - JOUR
T1 - Enthalpy of formation of the cubic fluorite phase in the ceria-zirconia system
AU - Lee, Theresa A.
AU - Stanek, Christopher R.
AU - McClellan, Kenneth J.
AU - Mitchell, Jeremy N.
AU - Navrotsky, Alexandra
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/4
Y1 - 2008/4
N2 - The enthalpy of formation of cubic ceria-zirconia solid solutions (c-Ce(1-x)ZrxO2, 0.05 ≤ × ≤ 0.75) at 25°C with respect to monoclinic zirconia (m-ZrO2) and cubic ceria (c-CeO2) has been measured by high-temperature oxide melt solution calorimetry. In contrast to fluorite solid solutions containing trivalent oxides (e.g., yttria-zirconia), mixing in c-Ce1-xZrxO2 shows moderate positive deviation from ideality. Evaluating the data within the framework of a regular solution model, the interaction parameter, Ω, is +51.0 ± 8.0 kJ/mol. The introduction of undersized Zr into CeO2 severely distorts and destabilizes the oxygen sublattice. Destabilization of c-Ce1-xZrxO2 may be relieved by reduction or clustering. A stable ordered compound in the CeO2-ZrO2 system is thermodynamically unlikely.
AB - The enthalpy of formation of cubic ceria-zirconia solid solutions (c-Ce(1-x)ZrxO2, 0.05 ≤ × ≤ 0.75) at 25°C with respect to monoclinic zirconia (m-ZrO2) and cubic ceria (c-CeO2) has been measured by high-temperature oxide melt solution calorimetry. In contrast to fluorite solid solutions containing trivalent oxides (e.g., yttria-zirconia), mixing in c-Ce1-xZrxO2 shows moderate positive deviation from ideality. Evaluating the data within the framework of a regular solution model, the interaction parameter, Ω, is +51.0 ± 8.0 kJ/mol. The introduction of undersized Zr into CeO2 severely distorts and destabilizes the oxygen sublattice. Destabilization of c-Ce1-xZrxO2 may be relieved by reduction or clustering. A stable ordered compound in the CeO2-ZrO2 system is thermodynamically unlikely.
UR - http://www.scopus.com/inward/record.url?scp=42949139779&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=42949139779&partnerID=8YFLogxK
U2 - 10.1557/jmr.2008.0143
DO - 10.1557/jmr.2008.0143
M3 - Article
AN - SCOPUS:42949139779
SN - 0884-2914
VL - 23
SP - 1105
EP - 1112
JO - Journal of Materials Research
JF - Journal of Materials Research
IS - 4
ER -