Dipole Centres in Rare-Earth-Doped CaF2

J. Kiessling 1  and A. Scharmann 1
  • 1 I. Physikalisches Institut, Universität Gießen

The reorientation of dipole centres in CaF2: RE3+ (RE: Gd, Tb, Lu) is investigated by the method of ionic thermocurrent (ITC). ITC peaks below 200 K are caused by reorientation of RE3+-F--complexes and related dipole centres, whereas peaks above 200 K seem to be of other origin. Both types of ITC peaks cannot be discriminated by polarization field strength dependence.

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