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Enthalpies of formation in the scandia‐zirconia system
Author(s) -
Grosso Robson L.,
Muccillo Elia. S.,
Castro Ricardo H. R.
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14945
Subject(s) - monoclinic crystal system , enthalpy , standard enthalpy of formation , cubic zirconia , tetragonal crystal system , solid solution , calorimetry , oxide , materials science , standard enthalpy change of formation , thermodynamics , ionic conductivity , chemistry , crystallography , crystal structure , metallurgy , ceramic , physics , electrode , electrolyte
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% Sc 2 O 3 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.