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.

Date Published: 1 August 1990
PDF: 6 pages
Proc. SPIE 1274, Electro-Optic and Magneto-Optic Materials II, (1 August 1990);

Published in SPIE Proceedings Vol. 1274:
Electro-Optic and Magneto-Optic Materials II
Hans Dammann, Editor(s)