Thermal expansion of β-BaB2O4 and BaB4O7 borates
Source abstract
Abstract
The thermal behavior of β-BaB 2 O 4 and BaB 4 O 7 borates is investigated using high-temperature X-ray powder diffraction analysis. The components of the thermal expansion tensor and the tensor orientation with respect to the crystallographic axes are calculated. Thermal deformations are analyzed in relation to the crystal structure. The thermal expansion of the β-BaB 2 O 4 borate is maximum along the c axis and close to zero in the ab plane. The thermal expansion anisotropy correlates with the layered structure, the orientation of the optical indicatrix, and the thermal ellipsoids of atoms. The thermal expansion of the BaB 4 O 7 borate is studied in three high-temperature X-ray diffraction experiments (two experiments with heating and one experiment with cooling). The thermal expansion of this compound is strongly anisotropic: the expansion is maximum in the ac monoclinic plane, whereas the contraction is observed along the b axis.
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Research context
OpenAlex topics: X-ray Diffraction in Crystallography · High-pressure geophysics and materials · Crystal Structures and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (17)
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