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Defect association, Jahn-Teller or off-center effect in CaF2:Copper, BaF2:Silver ?

Contributors

Lefèvre, Valérie; Monnier, Alain; Schnieper, Marc; Lovy, Dominique; Bill, Hans

Published in

Zeitschrift für physikalische Chemie, vol. 200, no. 10, p. 265-273

Publication date

1997

Abstract

The results of a detailed optical and paramagnetic-resonance study performed on copper in CaF2 and silver in BaF2 are presented. Two different Ag+ centers were identified in BaF2. One is associated with an interstitial F- ion whereas the other one has a cubic surrounding. The Cu2+ ion in CaF2 was shown to reorient at 4.2 K between 6 equivalent minima of D2h symetry. This fact is interpreted with the aid of a T2gx(T2g+Eg) type Jahn-Teller effect. The nonlinear mixed coupling terms are shown to play an important role. The Cu+ impurity in CaF2 is presumably off-center in the F- sublattice without associated defect or impurity.

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UNIGE research groups

Citation (ISO format)

LEFÈVRE, Valérie et al. Defect association, Jahn-Teller or off-center effect in CaF2:Copper, BaF2:Silver ? In: Zeitschrift für physikalische Chemie, 1997, vol. 200, n° 10, p. 265–273. doi: 10.1524/zpch.1997.200.Part_1_2.265

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Article (Published version)

Identifiers

Journal ISSN

0323-4479
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Technical informations

Creation

21/09/2009 16:03:38

First validation

21/09/2009 16:03:38

Update

14/03/2023 15:12:03

Status update

14/03/2023 15:12:03

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