Abstract
Single crystals of zircon
containing both Eu3+ and U4+
were grown from flux melts cooled at rates varying between 4�/hr and 2�/hr.
Irradiation with u.v. develops colour
centres only in those regions of a crystal containing Eu3+
and U4+. Fluorescence and absorption spectra measured at
temperatures down to 77�K show that these centres are similar in behaviour to F
and F' centres in the alkali halides. They are thought to be related to an
exchange coupled pair, U4+-02-Eu3+,
but the experimental data permit only a description in terms of one-electron
energy levels. The same basic behaviour is observed for zircon containing U4+
and any other lanthanide but some interesting differences are described
for U4+, Dy3+.
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