Phase formation in ternary systems of sodium, rare-earth (scandium, indium, and ytterbium), and boron oxides
https://doi.org/10.21285/achb.974
EDN: GKTMGL
Abstract
The study was aimed at examining phase equilibria in Na2O–R2O3–B2O3 systems (R = In, Sc, Yb). Interactions in these systems were analyzed using the solid-state reaction method. Phase formation in the ternary systems of sodium, rare-earth (scandium, indium, and ytterbium), and boron oxides was studied for the first time in the subsolidus region within the temperature range of 700–750°С. Preliminary triangulation of the analyzed systems was conducted. At 750°С, the isothermal cross sections of Na2O–R2O3–B2O3 (R = In, Sc, Yb) systems are represented by eight, thirteen, and eleven triangles of coexisting phases, respectively. The study confirmed the formation of three known double sodium-scandium borates in the Na2O–Sc2O3–B2O3 system: Na3Sc(BO3)2, Na3Sc2(BO3)3, and NaScB2O5. Also, a double sodium-scandium borate of approximate composition Na3ScB8O15 was found to form, which was indexed as monoclinic (approximate space symmetry group Cc). The unit cell parameters were refined using the Le Bail method: a = 12.625(6); b = 7.725(2); c = 10.409(3), β = 53.19(2)°. The Na2O–Yb2O3–B2O3 system contains three new double borates: Na3Yb(BO3)2, Na3YbB8O15, and borate with a composition close to the stoichiometric ratio Na2O•Yb2O3•B2O3. The formation of the following compounds was first experimentally shown: Na3YbB8O15 isostructural to Na3GdB8O15 and isoformula Na3Yb(BO3)2, which is not isostructural to Na3Y(BO3)2. The triple oxide system with indium was found to be eutectic, i.e., without the formation of double sodium-indium borates.
Keywords
ternary oxide systems,
double borates of sodium and rare-earth elements,
solid-phase synthesis,
X-ray diffraction analysis,
auto-indexing
Supporting agencies: The Russian Science Foundation financially supported the work (grant no. 23-23-00451).
About the Authors
A. K. Subanakov
Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences; Banzarov Buryat State University
Russian Federation
Russian Federation
Alexey K. Subanakov, Cand. Sci. (Chemistry), Head of the Laboratory; Senior Lecturer
6, Sakhyanova St., Ulan-Ude, 670047;
24a, Smolin St., Ulan-Ude, 670000
E. V. Kovtunets
Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
Evgeniy V. Kovtunets, Researcher
6, Sakhyanova St., Ulan-Ude, 670047
A. N. Sobolev
Banzarov Buryat State University
Russian Federation
Russian Federation
Andrey N. Sobolev, Laboratory Assistant
24a, Smolin St., Ulan-Ude, 670000
A. S. Tankhaeva
AO Khiagda
Russian Federation
Russian Federation
Altana S. Tankhaeva, Lead Engineer
Bagdarin village, 671510
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Review
For citations:
Subanakov A.K., Kovtunets E.V., Sobolev A.N., Tankhaeva A.S. Phase formation in ternary systems of sodium, rare-earth (scandium, indium, and ytterbium), and boron oxides. Proceedings of Universities. Applied Chemistry and Biotechnology. 2025;15(2):158–166. (In Russ.) https://doi.org/10.21285/achb.974. EDN: GKTMGL
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