EPR study of the CaF2 powder mechanochemical doping with rare-earth ions
Abstract
In the present work we show with electron paramagnetic resonance (EPR) spectroscopy that in the process of the mechanochemical doping of the CaF2 fine particles with Er3+ and Yb3+ ions the cubic symmetry rare-earth (RE) ion centers are formed with the concentration proportional to the particles surface in the sample. Amount of the mechano-doped RE-ion centers is proportional to ηα, where η is the weight fraction of the RE fluoride in the initial mixture and α~0.8. Cubic symmetry centers dominate in the EPR spectrum up to η=0.1. A hypothesis of the cubic RE-ion center formation is proposed according to which its origin is associated with the presence of the ideal cleavage planes in the CaF2 crystals: during the mechano-doping a considerable fraction of the rare-earth ions is trapped between the cleavage planes of the agglomerating particles, thereby getting into the crystal field of the cubic symmetry.
About the Authors
I. A. Irisova
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya, 18, Kazan 420008
A. A. Rodionov
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya, 18, Kazan 420008
D. A. Tayurskii
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya, 18, Kazan 420008
R. V. Yusupov
Kazan Federal University
Russian Federation
Russian Federation
Kremlevskaya, 18, Kazan 420008
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Review
For citations:
Irisova I.A., Rodionov A.A., Tayurskii D.A., Yusupov R.V. EPR study of the CaF2 powder mechanochemical doping with rare-earth ions. Magnetic Resonance in Solids. 2013;15(2):13203 (9 pp.).
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