Abstract
In this study, Ba3Lu(BO3)3 borate obtained by solid-phase synthesis is explored by high-temperature X-ray powder diffraction in the temperature range from 25 to 900°C. At room temperature, the compound expands slightly anisotropically (αmax/αmin = 1.2), and with an increase in temperature, the degree of anisotropy increases significantly (αmax/αmin = 6.9 at 900°C). The maximum expansion is observed along the crystallographic axis c (αc = 10.45 × 10–6°C–1 at 25°C and 36.34 × 10–6°C–1 at 900°C), perpendicular to which the boron-oxygen triangles [BO3] are located, and the minimum is in the plane where the triangles are located.
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Funding
The synthesis, interpretation of X-ray data, and generalization of the results obtained in this study were supported by scholarship no. SP-408.2022.3 (Biryukov Y.P.) of the President of the Russian Federation; and the heat treatment of samples and X-ray experiments conducted were supported by state task (no. 0081-2022-0002, Institute of Silicate Chemistry, Russian Academy of Sciences) of the RF Ministry of Science and Higher Education.
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Biryukov, Y.P., Bubnova, R.S. Thermal Expansion of Ba3Lu(BO3)3 Borate. Glass Phys Chem 49, 374–378 (2023). https://doi.org/10.1134/S1087659623600291
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DOI: https://doi.org/10.1134/S1087659623600291