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Temperature Dependence of the Iron Acceptor Level in Aluminum Oxide
Author(s) -
BLUM J. B.,
TULLER H. L.,
COBLE R. L.
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.tb10488.x
Subject(s) - acceptor , valence (chemistry) , materials science , analytical chemistry (journal) , ultraviolet , doping , iron oxide , absorption (acoustics) , atmospheric temperature range , absorption spectroscopy , aluminium , chemistry , optics , optoelectronics , metallurgy , condensed matter physics , physics , organic chemistry , chromatography , meteorology , composite material
Optical absorption measurements were performed on undoped and iron‐doped Al 2 O 3 single‐crystal samples cut from the same wafer. Measurements were made in the ultraviolet spectral range at 7=25° to 500°C. A shoulder observed at 4.8 eV in the absorption spectrum of the iron‐doped sample at 25°C was attributed to a valence band‐to‐iron acceptor level transition. This structure shifted to lower energies as the temperature increased at a rate of 5.6°lO −4 eV/°C.