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

Authors
Lefèvre, Valérie
Published in Zeitschrift für physikalische Chemie. 1997, vol. 200, no. 10, p. 265-273
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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Research group Groupe Bill
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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. https://archive-ouverte.unige.ch/unige:2810

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Deposited on : 2009-09-21

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