Abstract
Detailed X-ray analysis of variations in the structure of yttrium orthoborate in the process of successive high-temperature isothermal anneals of an originally amorphous precursor state is performed. It is established that the diffraction reflex intensity distribution of YBO3 measured at room temperature, obtained in the initial stages of crystallization, corresponds to the known low-temperature vaterite phase with the space group (sp. gr.) P63/m and, after a series of high-temperature anneals, it transforms into a distribution known for the vaterite modification with the sp. gr. P63/mmc and the same lattice parameters. This result is explained on the basis of the sphericity of X-ray waves and is connected with the transformation of the crystallites from a spherical shape upon low-temperature anneals to a dumbbell shape upon high-temperature anneals. As a result of in situ experiments conducted at 1250°C, it was established that the initial low-temperature hexagonal vaterite cell transforms above 1000°C into a monoclinic cell.
Published Version
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