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Thermochemistry of the ZrO 2 –SrO System: From enthalpies of formation and heat capacities of the compounds to the phase diagram
Author(s) -
Gong Weiping,
Xie Yun,
Zhao Zhentin,
Li Yajie,
Navrotsky Alexandra
Publication year - 2020
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.16812
Subject(s) - calphad , thermochemistry , phase diagram , differential scanning calorimetry , thermodynamics , standard enthalpy of formation , calorimetry , phase (matter) , work (physics) , chemistry , oxide , component (thermodynamics) , materials science , organic chemistry , physics
The thermodynamics of the ZrO 2 –SrO system is of interest for the optimization of synthesis and applications of functional materials and high‐temperature structural ceramics. Earlier data on phase relationships and thermodynamic properties of the system are unfortunately scattered and inconsistent. In this study, the compounds Sr n+1 Zr n O 3n+1 (n = 3, 2, and 1) were prepared by solid‐state reaction. Their heat capacities from 573 to 1273 K were measured by differential scanning calorimetry and their enthalpies of formation from component oxides at 298 K were determined by high‐temperature oxide melt solution calorimetry. The CALPHAD method was used to assess the ZrO 2 –SrO system, using both available literature data and our new measurements. A self‐consistent thermodynamic database and the calculated phase diagram of the ZrO 2 –SrO system are provided. This work is a prerequisite for accurate predictions of the relationships among the composition, temperature, and microstructure of complex functional and structural materials containing ZrO 2 and SrO.