This article is cited in 1 paper

Phase transitions

Polymorphism of ScBO$_{3}$ at the solid phase synthesis from amorphous precursors

I. M. Shmyt'ko

Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region

Abstract: Detailed X-ray studies of changes in the structure of the scandium orthoborate ScBO$_{3}$ in the process of serial isothermal annealing of the initial charge in the form of amorphous precursor were carried out. It was shown that upon successive annealing of the amorphous precursor, the crystalline phase first forms at an annealing temperature of 710$^\circ$C, the positions of the reflections of which do not coincide with the positions that of the known calcite structure. This phase exists in a very narrow temperature range ($\approx$ 30$^\circ$C) and, when the annealing temperature is increased to 750$^\circ$C, it completely transfers to the known rhombohedral phase of calcite. Using the ENDEAVOR software, the cell parameters, atom positions in the cell, and the spatial symmetry group of the new phase were determined. It turned out that the new phase corresponds to the hexagonal structure of the faterite (S.G. $P63/mmc$), known for other orthoborates of rare-earth elements (REE).

Keywords: nanosystems, borates REM, phase transitions, X-ray diffraction studies.

Received: 20.05.2019
Revised: 20.05.2019
Accepted: 17.06.2019

DOI: 10.21883/FTT.2019.11.48431.482

 English version: Physics of the Solid State, 2019, 61:11, 2189–2193

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