Abstract
Thermal deformations of noncentrosymmetric silver and bismuth pentaborate AgBi2B5O11 are studied by the X-ray diffraction analysis of single crystals. Thermal expansion is anisotropic (αa = 18, αb = 5, αc = 1 × 10−6°C−1), which is caused by the orientation of the pentaborate B5O10 groups, along the axis of which the expansion is minimal. With increasing temperature, the degree of noncentrosymmetric deviation of the structure decreases. The parameters of thermal displacements of bismuth are refined in the anharmonic approximation. An assumption is made about the relationship between the shape of the figure of thermal displacements with participation in vibrations perpendicular to the three strongest Bi–O bonds.
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ACKNOWLEDGMENTS
The research was carried out using the equipment of the resource center of St. Petersburg State University “X-Ray Diffraction Research Methods.”
Funding
This research was supported by the Russian Science Foundation, project no. 18-73-00176.
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Translated by Sh. Galyaltdinov
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Volkov, S.N., Charkin, D.O. & Bubnova, R.S. Structural Changes of AgBi2B5O11 in the Range of 100 to 400 K. Glass Phys Chem 47, 70–73 (2021). https://doi.org/10.1134/S1087659621010144
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DOI: https://doi.org/10.1134/S1087659621010144