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Electron Nuclear Double Resonance of the Trapped Hole Center in α‐Al 2 O 3 :Mg 2+
Author(s) -
Duvarney R. C.,
Niklas J. R.,
Spaeth J.M.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280233
Subject(s) - ion , atomic physics , electron nuclear double resonance , electron , vacancy defect , resonance (particle physics) , isotropy , impurity , chemistry , electron paramagnetic resonance , nuclear magnetic resonance , physics , crystallography , nuclear physics , organic chemistry , quantum mechanics
The superhyperfine (shf) interactions of trapped hole centers with 27 Al neighbor nuclei in α‐Al 2 O 3 doped with Mg 2+ are resolved with electron nuclear double resonance (ENDOR). The hole is localized at an O 2− ion. With electron nuclear triple resonance (double ENDOR) it could be established that one of the two next nearest neighbor Al 3+ ions is missing, but no ENDOR lines due to a Mg 2+ impurity can be identified. The isotropic shf interaction constants of the nearest and next nearest Al 3+ neighbors are negative. The shf interactions are quantitatively interpreted by taking into account transferred exchange polarization at the oxygen ion. From this, it seems more likely than not that the Al 3+ vacancy is filled by a Mg 2+ ion.