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The magnetic circular dichroism and optically detected EPR spectra of rareearth
ions Er3+, Tm3+, Yb3+ in clusters formed by these ions or by diamagnetic
ions Lu3+ or Y are obtained. Thus new paramagnetic states of Er3+,Tm3+ and Yb3'
ions in fluorites with nearly tetragonal symmetry of these ions in clusters and
coalescence of clusters into grains were established. It is concluded that in the
whole range of activator concentrations 0.1-40 mol% the clusters under investigation
are similiar in structure to the high symmetry Y6F37 clusters previously observed
by X-ray methods in natural mineral of tveitite. The noncentral F ions in
clusters are probably responsible for the existence of two-level systems also discovered
by our studies in activated fluorites.
Sergei A. Kuchinskii
"Structure and magneto-optical properties of activated fluorite crystals with clusters of rare-earth and yttrium ions", Proc. SPIE 1274, Electro-Optic and Magneto-Optic Materials II, (1 August 1990); https://doi.org/10.1117/12.20508
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Sergei A. Kuchinskii, "Structure and magneto-optical properties of activated fluorite crystals with clusters of rare-earth and yttrium ions," Proc. SPIE 1274, Electro-Optic and Magneto-Optic Materials II, (1 August 1990); https://doi.org/10.1117/12.20508