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Recent Attempts to Detect Magnesium in a Heavily Doped Sapphire Bicrystal by Spatially Resolved Electron Energy‐Loss Spectroscopy
Author(s) -
Bruley John,
Hoche Thomas,
Kleebe HansJoachim,
Rühle Manfred
Publication year - 1994
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.1151-2916.1994.tb04593.x
Subject(s) - spinel , electron energy loss spectroscopy , doping , sapphire , materials science , analytical chemistry (journal) , spectroscopy , magnesium , condensed matter physics , crystallography , chemistry , optics , metallurgy , transmission electron microscopy , physics , nanotechnology , optoelectronics , laser , chromatography , quantum mechanics
Needle‐shaped spinel precipitates in a matrix of heavily MgO‐doped α‐AI 2 O 3 bicrystal containing a near Σ= 11 tilt boundary were examined by spatially resolved electron energy‐loss spectroscopy. The Mg content was consistent with the precipitate being an alumina‐rich spinel of composition MgO Σ(Al 2 O 3 ) 2 . The Al and Mg K and L 2.3 absorption edge structures were recorded. No evidence could be found for preferential Mg segregation to the tilt boundary. Using the precipitates as a calibration standard, a limit of detection equivalent to about 0.01 monolayer is deduced. Comparison of the Al‐ L 2.3 edge recorded at the Σ= 11 boundary to that of the same boundary in undoped material suggests that the local structure is independent of Mg doping. The lack of Mg segregation to the Σ= 11 boundary is perhaps attributable to the low energy and close packing of this interface.