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 (α_max/α_min = 1.2), and with an increase in temperature, the degree of anisotropy increases significantly (α_max/α_min = 6.9 at 900°C). The maximum expansion is observed along the crystallographic axis c (α_c = 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.

中文翻译：

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Ba3Lu(BO3)3 硼酸盐的热膨胀

摘要

本研究通过固相合成得到的Ba ₃ Lu(BO ₃ ) _{3硼酸盐在25~900℃温度范围内进行高温X射线粉末衍射分析。}在室温下，化合物会轻微地各向异性膨胀（α _max /α _min = 1.2），并且随着温度的升高，各向异性程度显着增加（900°C 时α _max /α _min = 6.9）。沿晶轴c观察到最大膨胀（α _c = 10.45 × 10 ^–6 °C ^–1在 25°C 和 36.34 × 10 ^–6°C ^–1 at 900°C)，垂直于硼-氧三角形[BO ₃ ]所在的位置，最小值位于三角形所在的平面内。