A model is proposed for the Lu2SiO5 crystal With cerium impurity, and
the defect formation energy, ion relaxation energy, and the defect-ind
uced changes of the Madelung potentials are calculated. The calculatio
ns show substitution of the cerium ion for the lutetium ion in the Lu-
1 position to be energetically preferred. (C) 1997 American Institute
of Physics.