Abstract
When fluorite crystals, such as CaF2, are doped with trivalent rare earth ions, interstitial fluoride ions are known to provide charge compensation. The fluoride interstitial can exist either in association with a dopant ion, perturbing its electronic state, or in a distant position where the dopant site symmetry becomes cubic. Dimers, as well as higher order clusters, have also been observed.1
© 1984 Optical Society of America
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