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In Situ study of Nucleation of Zirconia in an MgO–Al 2 O 3 –SiO 2 Glass
Author(s) -
Dargaud Olivier,
Calas Georges,
Cormier Laurent,
Galoisy Laurence,
Jousseaume Cécile,
Querel Gilles,
Newville Matthew
Publication year - 2010
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.1551-2916.2009.03409.x
Subject(s) - nucleation , materials science , cubic zirconia , thermal treatment , thermal stability , spectroscopy , mineralogy , chemical engineering , ceramic , crystallography , composite material , thermodynamics , chemistry , physics , quantum mechanics , engineering
Crystalline nucleation is investigated during the dynamical heat treatment of a ZrO 2 –MgO–Al 2 O 3 –SiO 2 glass by high‐temperature Zr K‐edge X‐ray absorption near‐edge spectroscopy. In the parent glass, the Zr coordination number is higher than in most glasses, explaining the structural instability of Zr during thermal treatment. The Zr local structure is modified at 30°C above the nucleation onset. Crystalline nucleation is characterized by the formation of peculiar nano‐ZrO 2 particles, which are stable until completion of the thermal treatment. These nano‐ZrO 2 particles are stable during the elaboration of glass–ceramics, without any Zr 4+ remaining in the glassy matrix of the final material.