Thermal Expansion of Ba3Lu(BO3)3 Borate

Ya. P. Biryukov; Бирюков Я. П.; R S. Bubnova; Бубнова Р. С.

doi:10.31857/S0132665123600048

Thermal Expansion of Ba3Lu(BO3)3 Borate

Authors: Biryukov Y.P.¹, Bubnova RS.¹
Affiliations:
1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia
Issue: Vol 49, No 4 (2023)
Pages: 432-438
Section: Articles
URL: https://rjonco.com/0132-6651/article/view/663326
DOI: https://doi.org/10.31857/S0132665123600048
EDN: https://elibrary.ru/SGYEIM
ID: 663326

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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

Keywords

borate, rare earth elements, thermal expansion, high-temperature X-ray powder diffraction, crystal structure

About the authors

Ya. P. Biryukov

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

Email: y.p.biryukov@gmail.com
Россия, 199034, наб. Макарова, 2, Санкт-Петербург

R S. Bubnova

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

Author for correspondence.
Email: rimma_bubnova@mail.ru
Россия, 199034, Санкт-Петербург, наб. Макарова, 2

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