Crystal fields of hexameric rare-earth clusters in fluorites / Nikiforov AE,Zakharov AY,Ugryumov MY,Kazanskii SA,Ryskin AI,Shakurov GS // PHYSICS OF THE SOLID STATE. - 2005. - V. 47, l. 8. - P. 1431-1435.

ISSN/EISSN:

1063-7834 / нет данных

Type:

Article; Proceedings Paper

Abstract:

In solid solutions of alkaline- and rare-earth fluorides with a fluorite structure, ions of most elements of the rare-earth (RE) row form hexameric clusters that assimilate the minor component of the solid solutions (fluorine) and build it into the cubic fluorite lattice without changing its shape. An analysis of the EPR spectra of paramagnetic RE ions (Er3+, Tm3+, Yb3+) in clusters of diamagnetic ions (Lu3+, Y3+) confirms their hexagonal structure, which was established when studying the superstructures of the compounds under study. In such a cluster, a RE ion is in a nearly tetragonal crystal field, with the parameters of this field differing radically from those of single cubic and tetragonal RE centers in crystals with a fluorite structure. In particular, this field causes high (close to limiting) values of the g(parallel to) factors of the ground states of the paramagnetic RE ions. Computer simulation is used to determine the atomic structure of a hexameric cluster in MF2 crystals (M = Ca, Sr, Ba). The crystal field and energy spectrum of Er3+, Tm3+, and Yb3+ ions in such clusters are calculated, and the spectroscopic parameters of the ground states of these ions are determined. The calculations confirm the earlier assumption that the unusual EPR spectra of nonstoichiometric fluorite phases are related to RE ions in hexameric clusters. (c) 2005 Pleiades Publishing, Inc.

Author keywords:

DEFECT STRUCTURE; IONS; SYSTEMS; CAF2

DOI:

10.1134/1.2014482

Web of Science ID:

ISI:000231127400007

Соавторы в МНС:

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Другие поля

Поле	Значение
Note	12th Feofilov Workshop on Spectroscopy of Crystal Activated by Rare-Earth and Transition-Metal Ions, Yekaterinburg, RUSSIA, SEP 22-25, 2004
Organization	Russian Fdn Basic Res; Int Assoc European Comm; Russian Acad Sci, Dept Phys Sci
Publisher	AMER INST PHYSICS
Address	CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA
Language	English
Keywords-Plus	DEFECT STRUCTURE; IONS; SYSTEMS; CAF2
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	Anatoliy.Nikiforov@usu.ru
ResearcherID-Numbers	Nikiforov, Anatoliy/L-4436-2016
Number-of-Cited-References	18
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	9
Journal-ISO	Phys. Solid State
Doc-Delivery-Number	954AV