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Direct Calorimetric Measurement of Enthalpies of Phase Transitions at 2000°–2400°C in Yttria and Zirconia
Author(s) -
Navrotsky Alexandra,
Benoist Luc,
Lefebvre Herve
Publication year - 2005
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/j.1551-2916.2005.00506.x
Subject(s) - economic geography , geography , international conflict , regional science , political science , sociology , law , politics
High‐temperature differential thermal analysis provided data on phase transitions in zirconia and yttria. The tetragonal form of ZrO 2 transforms to the cubic fluorite structure at 2311°±15°C with an enthalpy of 3.4±3.1 kJ/mol. Cubic C‐type Y 2 O 3 transforms, probably to the fluorite structure, at 2308°±15°C with Δ H =47.7±3.0 kJ/mol. This high‐temperature polymorph melts at 2382°±15°C with an enthalpy of fusion of 35.6±3.0 kJ/mol.