An Experimental E.P.R. Study of Cr 3+ Ions in Alf 3 Amorphous at X–Band Frequency and Versus Temperature

摘要

The main subject of this work is the study of structural properties of the amorphous AlF 3 doped with Cr 3+ , obtained by dehydratation of α– AlF 3 ,3 H 2 O , by electron paramagnetic resonance (EPR). The experimental studies upon powdered amorphous doped with various Cr 3+ concentrations have been achieved at X –band frequency and versus temperature. Evidence of two types of centers is obtained: ions pairs with antiferromagnetic coupling and isolated Cr 3+ ions.