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Electron paramagnetic resonance and X-ray diffraction study of PbF2 fine powders mechanochemically doped with Er3+ ions.

Title: Electron paramagnetic resonance and X-ray diffraction study of PbF2 fine powders mechanochemically doped with Er3+ ions.
Authors: Irisova, I. A.1 IAIrisova@kpfu.ru, Gracheva, I. N.1, Lysogorskiy, Y. V.1, Shinkarev, A. A.2, Rodionov, A. A.1, Tayurskii, D. A.1, Yusupov, R. V.1
Source: Magnetic Resonance in Solids. 2017, Vol. 19 Issue 2, p1-9. 9p.
Subject Terms: *MECHANICAL chemistry, *DOPING agents (Chemistry), *ELECTRON paramagnetic resonance spectroscopy, *X-ray diffraction, *LEAD compounds, *METAL powders, *ERBIUM compounds
Abstract: Investigation of the mechanochemical doping of PbF2 powders with Er3+ ions with electron paramagnetic resonance and X-ray diffraction is presented. In the analysis of the results a possibility of the structural transformation between the cubic β-PbF2 and orthorhombic α-PbF2 phases in the course of synthesis was taken into account. It is shown that regardless of the initial state of PbF2 it reveals high eficiency of the mechanochemical doping with Er3+ ions. Obtained particles are found in (α=β)-PbF2 structurally inhomogeneous state with the majority of the Er3+ ions located in the equilibrium α-PbF2 fraction. Preferrable location of the Er3+ ions in the ff-PbF2 phase is related to the fact that the formation of the cation vacancies necessary for a mechanically activated diffusion of erbium ions into the particles and nucleation of the α-PbF2 phase proceed in parallel and is mediated by dislocations created in the course of synthesis. Annealing of the sample leads to a conversion of its entire volume into the metastable β-PbF2 phase with all the Er3+ centers possessing the cubic symmetry. [ABSTRACT FROM AUTHOR]
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