Archive / Volume LXXVIII 2025

Galyna. NYCHYPORUK, Davyd DYMYTRYADI, Vasyl ZAREMBA, Oleg DELENKO, Yaroslav KALYCHAK

Ivan Franko National University of Lviv, Kyryla i Mefodiya Str., 6, 79005 Lviv, Ukraine
e-mail: yaroslav.kalychak@lnu.edu.ua

THE SYSTEM Tb–Co–In: PHASE EQUILIBRIA AND CRYSTAL STRUCTURE OF THE COMPOUNDS

Interaction between the components in the Tb–Co–In system was investigated by X-ray powder diffraction and, partially, scanning electron microscopy with energy-dispersive X-ray spectroscopy. Isothermal section of the phase diagram was constructed in full concentration range at 870 K.
The samples were synthesized in an arc-furnace on a water-cooled Cu-plate under an argon atmosphere and annealed in silica tubes at 870 K for two months. The phase analysis was performed by X-ray powder diffraction method. Microstructures of polished samples and quantitative and qualitative analysis were carried out on a Tescan Vega 3 LMU scanning electron microscope equipped with an Oxford Instruments SDD X-MaxN20 detector.
Existence of eight ternary compounds, namely TbCoIn5 (HoCoGa5-type structure), Tb2CoIn8 (Ho2CoGa8-type structure), TbCo2In (PrCo2Ga-type structure), Tb10Co3In10 (Tb10Co3In10-type structure), Tb11Co4In9 (Nd11Pd4In9-type structure), Tb23Co6,7In20,3 (Er23Co6.7In20.3-type structure), Tb6Co2.14In0.86 (Ho6Co2Ga-type structure), Tb14Co3In3 (Lu14Co3In3-type structure) has been confirmed and three compounds have been discovered in the Tb–Co–In system at the temperature of investigation. The crystal structure of Tb26Co6In11 compound was refined using X-ray powder data (STOE STADI P, Cu Kα1 radiation). It belongs to Sm26Co11Ga6 structure type (space group P4/mbm, tP86, a = 11.893(6); c = 15.824(8) Å, Rwp = 0.0552). The crystal structure of the compounds Tb5Co3In2 and TbCo4In remains unknown. The substitution of Tb for In up to 5 at.% was observed for compound TbCo3.
Compounds of the Tb–Co–In system with a known crystal structure can be divided into two groups. The first group consists of terbium-rich compounds Tb26Co6In11, Tb6Co2.14In0.86 and Tb14Co3In3. These are complex multilayer structures with large values of cell parameters. Another group of compounds includes double-layer structures in the direction perpendicular to the shortest cell period. It should be noted that the value of shortest cell parameter decreases from ~ 4.5 to ~ 3.6 Å with increasing terbium content. These compounds can be considered as being built from fragments of simpler structures. Compounds TbCoIn5 and Tb2CoIn8 are built from fragments of structural types AuCu3 and PtHg2, compound TbCo2In – from fragments of CsCl- and CaCu5-types, and compounds Tb10Co3In10, Tb11Co4In9, Tb23Co6.7In20.3 – from fragments of CsCl- and AlB2-types.

Keywords: indium, cobalt, terbium, ternary system, isothermal section, ternary compound.

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