Enthalpies of formation in the scandia‐zirconia system. Issue 9 (22nd May 2017)

• Record Type: Journal Article
• Authors: Grosso, Robson L.; Muccillo, Eliana N. S.; Castro, Ricardo H. R.
• Is Part Of: Journal of the American Ceramic Society. Volume 100:Issue 9(2017)
• Page Start: 4270
• Page End: 4275
• Publication Date: 2017-05-22
• Subjects: phase diagrams -- scandium/scandium compounds -- Thermodynamics -- Zirconia; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.14945
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: The scandia‐zirconia (ScZ) solid solutions have been attracting attention from the communities interested in solid‐oxide fuel cells because they possess the highest ionic conductivity among zirconia‐based materials. However, this system shows a relatively large number of polymorphs with lack of thermodynamic data to enable comprehensive phase control for property optimization. In this work, the enthalpy of formation of the ScZ system within the range 0–20 mol% Sc2 O3 is determined by combining the surface energy values with enthalpy of drop solution data obtained from high‐temperature oxide melt solution calorimetry. The heats of formation, a key data for understanding phase stability, for five polymorphs: monoclinic ( m ), tetragonal ( t ), cubic ( c ), and rhombohedral (β and γ) are reported for the first time.