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Thermal Segregation of Cations in Iron Aluminate Spinels
Author(s) -
PETUSKEY W. T.,
BOWEN H. K.
Publication year - 1981
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.1151-2916.1981.tb10227.x
Subject(s) - spinel , redistribution (election) , aluminate , vacancy defect , aluminium , materials science , thermal , chemistry , inorganic chemistry , analytical chemistry (journal) , mineralogy , metallurgy , crystallography , thermodynamics , physics , chromatography , cement , politics , political science , law
Thermal segregation experiments were performed on open and encapsulated wafers of Fe(Fe 1.51 Al 0.49 )O 4 spinels using CO 2 laser radiation as a heat source. The correlation of “apparent” marker movement and cation segregation led to the conclusion that the free exchange of gaseous oxygen at the external spinel surfaces is necessary to cause significant redistribution of aluminum and iron in a temperature gradient. This was explained by the different mobilities of different cations in a net vacancy (low. Effectively no segregation was observed for the zero vacancy flux condition.