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VOLUME 38 | ISSUE 9 | PAGE 521
Superstructure regions in the lattice of the solid solution (CaF2)1-x(ErF3)x, with x\geq0.001
The question of the clustering of Er3H~ rare-earth ions in CaF2 crystals has been resolved by means of an optically detectable electron spin resonance. At erbium concentrations above 0.1 mole %, a new crystalline phase is observed to be incorporated in the CaF2 lattice. This new phase has a high erbium concentration, tetragonal symmetry, and a factor g» ~ 15.5>^ for the Er3+ ion.




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