Dimer self-organization of impurity rare earth ions in forsterite (Mg2SiO4) single crystals as revealed by EPR spectroscopy
https://doi.org/10.26907/mrsej-24215
Abstract
Electron paramagnetic resonance is one of the most informative methods for studying the local structure and magnetic properties of impurity paramagnetic centers in crystals. This minireview presents the results of a study of paramagnetic centers formed by rare earth ions Ho3+, Tm3+, Er3+ and Yb3+ in single crystals of synthetic forsterite (Mg2SiO4). The structural features and magnetic properties of the studied centers are presented. It was found that a wellpronounced effect of dimer self-organization is observed for impurity trivalent ions in forsterite. As a result, concentration of dimer associates significantly exceeds the concentration expected with a statistically uniform distribution of impurity ions across the nodes of the crystal lattice.
Supporting agencies: I am grateful to Prof. B.Z. Malkin for attraction our attention to the effect of dimer selforganization of impurity trivalent ions substituting divalent ions in quasi-one-dimensional structural chains in single crystals. I would like to thank my colleagues, together with whom the described results were obtained. E.V. Zharikov, K.A. Subbotin, and D.A. Lis from Prokhorov General Physics institute of RAS grew the samples for the research. V.A. Shustov from Zavoisky Physical-Technical Institute has done a lot of work for the determinations of crystallographic axes in samples by the X-ray diffraction. A.A. Konovalov, L.V. Mingalieva, A.A. Sukhanov R.B. Zaripov from Zavoisky Physical- Technical Institute and S.I. Nikitin, E.N. Vorobieva, D.G. Zverev from Kazan (Volga Region) Federal University carried out measurements of the EPR spectra. Part of measurements was carried out using facilities of the Distributed Spectral-Analytical Center of Shared Facilities for Study of Structure, Composition and Properties of Substances and Materials of FRC Kazan Scientific Center of RAS. V.B. Dudnikova from Moscow State University carried out numerical modeling of various variants of the dimer associate structures in order to determine relative probabilities of their formation. The work was performed with the financial support from the government assignment for FRC Kazan Scientific Center of RAS.
About the Author
V. F. Tarasov
Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS
Russian Federation
Russian Federation
Kazan 420029
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Review
For citations:
Tarasov V.F. Dimer self-organization of impurity rare earth ions in forsterite (Mg2SiO4) single crystals as revealed by EPR spectroscopy. Magnetic Resonance in Solids. 2024;26(2):24215 (17 pp.). https://doi.org/10.26907/mrsej-24215
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