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Additive and Impurity Distributions at Grain Boundaries in Sintered Alumina
Author(s) -
JOHNSON W. C.,
STEIN D. F.
Publication year - 1975
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.1151-2916.1975.tb18764.x
Subject(s) - impurity , spinel , grain boundary , electron microprobe , materials science , transmission electron microscopy , metallography , microprobe , scanning electron microscope , auger electron spectroscopy , analytical chemistry (journal) , metallurgy , mineralogy , chemistry , composite material , microstructure , nanotechnology , physics , organic chemistry , chromatography , nuclear physics
Additive and impurity distributions at grain boundaries in sintered Al 2 O 3 were determined using a scanning Auger microprobe, transmission electron microscopy, metallography, and electron probe analysis. The results indicated that Ca was present uniformly at the boundaries as a segregant, whereas the Mg or Ni levels observed resulted from nonequilibrium spinel particles. The Ca concentrations were consistent with equilibrium segregation theory and followed an equilibrium segregation isotherm.