Abstract
Thermal expansion of an EuF2.136 nonstoichiometric crystal with the fluorite structure type (Eu 2+0.864 Eu 3+0.136 F2.136, lattice parameter 5.82171(5) Å) has been experimentally investigated in the temperature range of 9–500 K. The coefficient of thermal expansion is α = 15.8 × 10–6 K–1 at T = 300 K. The observed anomalies in the behavior of the coefficient of thermal expansion at T > 400 K are related to the oxidation processes with partition of Eu2+ ions. It is established by differential scanning calorimetry that the onset temperature of EuF2 + x oxidation in air is 430 K and that this process occurs in three stages. X-ray diffraction analysis shows that the oxidation is accompanied by the formation of a phase mixture based on two modifications of the Eu 3+1– y Eu 2+ y F3–y solid solution with the structure types of tysonite (LaF3), orthorhombic β-YF3 phase, and europium oxyfluorides of variable composition EuO1–xF1 + 2x, with dominance of the latter.
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Original Russian Text © D.N. Karimov, V.V. Grebenev, A.G. Ivanova, K.V. Khaydukov, A.A. Sidorov, E.A. Kulchenkov, P.A. Popov, B.P. Sobolev, 2018, published in Kristallografiya, 2018, Vol. 63, No. 4, pp. 586–592.
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Karimov, D.N., Grebenev, V.V., Ivanova, A.G. et al. Thermal Expansion of EuF2 + x Single Crystals and Their Thermal Stability. Crystallogr. Rep. 63, 614–620 (2018). https://doi.org/10.1134/S1063774518040107
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DOI: https://doi.org/10.1134/S1063774518040107