Electron paramagnetic resonance study of Al2+ in BeO

✍ Scribed by R. C. Du Varney; A. K. Garrison; S. B. Harem

• Publisher: John Wiley and Sons
• Year: 1971
• Tongue: English
• Weight: 353 KB
• Volume: 45
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2220450129

✦ Synopsis

Abstract

When single crystal BeO is X‐irradiated at room temperature, paramagnetic centers are formed. These centers are identified by EPR as electrons trapped at Al^3+^ impurities substitutional for beryllium ions. The g‐tensor is cylindrically symmetric with values g∥ = 2.003 and g⊥ = 2.004 with the axis of symmetry along an Al–O bond direction. The hyperfine tensor has the principal values A~x′x′~ = 207.6 G, A~y′y′~ = 175.7 G, and A~z′z′~ = 176.6 G. The x′‐ and z′‐directions lie in a plane which contains the polar or c‐axis and the Al–O bond direction. The z′‐axis makes an angle of 14° with the c‐axis. Also, an absorption spectrum in γ‐irradiated Thermalox 995, a commercial form of sintered BeO ceramic used in thermally stimulated exoelectron emission radiation dosimeters, is analyzed and shown to be the powder pattern of this aluminum impurity center.