ELECTRICAL RELAXATION OF DIMERS IN RARE-EARTH-DOPED CALCIUM-FLUORIDE

Authors
MCGOWAN PC FONTANELLA JJ WINTERSGILL MC LOMAX JF HAYDEN LM
Citation
Pc. Mcgowan et al., ELECTRICAL RELAXATION OF DIMERS IN RARE-EARTH-DOPED CALCIUM-FLUORIDE, Journal of physics and chemistry of solids, 54(5), 1993, pp. 513-516
Citations number
16
Categorie Soggetti
Physics, Condensed Matter",Chemistry
Journal title
Journal of physics and chemistry of solids → ACNP
ISSN journal
00223697
Volume
54
Issue
5
Year of publication
1993
Pages
513 - 516
Database
ISI
SICI code
0022-3697(1993)54:5<513:ERODIR>2.0.ZU;2-3
Abstract
Audio frequency complex impedance measurements have been carried out o ver the temperature range 310-510 K on samples of calcium fluoride con taining 0.1 mol% of either lanthanum or cerium. Consequently, the R(IV ) relaxation has been studied. The activation energies are found to be 1.049 and 1.089 eV for cerium and lanthanum, respectively. This relax ation is due to reorientation of a rare earth dimer. The structure of the defect site is discussed.