Abstract
Detailed X-ray studies of changes in the structure of terbium orthoborate TbBO3 in the course of successive high-temperature isothermal annealing of the initial mixture in the form of an amorphous precursor and in the form of a homogenized mixture of microcrystalline Tb7O12 and B2O3 powders have been carried out. It is shown that the formation of TbBO3 crystals in both cases occurs through the formation of intermediate two-phase states. Particularly, the triclinic high-temperature ν-TbBO3 phase is formed already at the first crystallization stages (about 600°C) almost simultaneously with the equilibrium vaterite modification of TbBO3 (sp. gr. P63/mmc) during low-temperature annealing of an amorphous precursor, which transforms into the vaterite modification at an annealing temperature of 850°C. The phase of monoclinic terbium trioxoborate TbB3O6 is formed at the first stages of phase formation (about 800°C) almost simultaneously with the vaterite phase when the feedstock is annealed in the form of a homogenized mixture of microcrystalline Tb7O12 and B2O3 powders. It also transforms into the vaterite modification at an annealing temperature of 950°, which is preserved up to the highest annealing temperatures in the experiment (1200°C). A hypothetical explanation of the formation of such two-phase states during low-temperature annealing of the feedstock and their disappearance at higher annealing temperatures is proposed.
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ACKNOWLEDGMENTS
I thank G.K. Strukova for her assistance in the synthesis of the amorphous precursor state of TbBO3. This work was carried out within the framework of the research plan of Institute of Solid State Physics, Russian Academy of Sciences.
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Shmyt’ko, I.M. Peculiarities of Phase Formation in TbBO3 during Isothermal Annealing. Phys. Solid State 61, 207–213 (2019). https://doi.org/10.1134/S1063783419020276
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DOI: https://doi.org/10.1134/S1063783419020276