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Kinetic Reactions in Quenched MgO:Fe 3+ Crystals
Author(s) -
YAGER T. A.,
KINGERY W. D.
Publication year - 1982
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.1151-2916.1982.tb09914.x
Subject(s) - electron paramagnetic resonance , cluster (spacecraft) , kinetic energy , quenching (fluorescence) , materials science , nitrogen , analytical chemistry (journal) , spectroscopy , crystallography , etching (microfabrication) , chemistry , nuclear magnetic resonance , fluorescence , nanotechnology , physics , organic chemistry , quantum mechanics , chromatography , computer science , programming language , layer (electronics)
Quenched single crystals of trivalent iron‐doped MgO were studied using etching and EPR spectroscopy. Quench‐rate measurements indicated that a liquid nitrogen quench from 1100°C is not rapid enough to prevent localized association and clustering. The distribution, size, and concentrations of precipitates, clusters, and associates in quenched crystals are critically dependent on both solute concentration and quench rate. At T<600°C, the mobility of iron is reduced as a result of cluster formation. Above 600°C, clusters dissociate, liberating mobile associates and vacancies.