Abstract
The structure, IR absorption and luminescence spectra of solid solutions of Lu0.99 ‒ xGdxEu0.01BO3 at 0 ≤ x ≤ 0.15 were studied. The correspondence between the structure and spectral characteristics of these compounds was established. It is shown that at x ≤ 0.05, the orthoborates Lu0.99 ‒ xGdxEu0.01BO3, consisting of lutetium borate LuBO3, which has two stable structural modifications (calcite and vaterite), and gadolinium borate GdBO3, which has only one structural modification (vaterite), form a solid solution with a calcite structure and a microcrystal size of 15–20 μm. As x increases, the amount of vaterite phase increases sequentially, and at x ≥ 0.1, the entire volume of the sample has a vaterite structure. At Gd3+ concentration in the range of 0.05 < x ≤ 0.1, the samples of Lu0.99 – xGdxEu0.01BO3 are two-phase. It is shown for the first time that at x > 0.05, the vaterite phase appears both in the volume of large microcrystals (15–20 μm) and in the form of small microcrystals (1–2 μm).
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ACKNOWLEDGMENTS
The authors thank the research facility unit of the Institute of Solid State Physics of the Russian Academy of Sciences for the study of samples by the method of IR spectroscopy, as well as their morphology.
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The work was carried out as a part of the state task of the ISSP RAS.
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Translated by V. Alekseev
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Shmurak, S.Z., Kedrov, V.V., Kiselev, A.P. et al. Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3. Phys. Solid State 63, 1081–1092 (2021). https://doi.org/10.1134/S1063783421070209
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DOI: https://doi.org/10.1134/S1063783421070209