PROCEEDINGS OF THE SHEVCHENKO SCIENTIFIC SOCIETY

Chemical Sciences

Archive / Volume LXX 2022

Nataliya DOMINYUK, Galyna NYCHYPORUK, Vasyl ZAREMBA

Ivan Franko National University of Lviv, Kyryla i Mefodiya Street 6, 79005 Lviv, Ukraine
e-mail: halyna.nychyporuk@lnu.edu.ua

DOI: https://doi.org/10.37827/ntsh.chem.2022.70.069

THE INTERACTION OF THE COMPONENTS IN THE R2T2In1-xGax (R = La, Ce; T = Ni, Cu) SYSTEMS

This work is devoted to the study of R2T2In1-xGax (R = La, Ce; T = Ni, Cu) systems at 870 K, namely the solubility of the fourth component in compounds with the composition 2:2:1 and structural characteristics of the solid solutions.
Samples for the investigation were synthesized by arc-melting of metals (purities better than 0.998) with subsequent annealing at 870 K for one month in the electric muffle furnace SNOL with automatic temperature control. The phase compositions of the alloys were characterized by means of X-ray powder diffraction (DRON-2.0M, FeKα-radiation, HZG 4a, CuKα-radiation and Guinier camera Fujifilm BAS–1800, CuKα-radiation) and energy dispersive X-ray analysis (scanning electron microscope Leica 420i). According to the results of experimental studies, the solubility of Gallium in the La2Ni2In and Ce2Ni2In compounds is not more than 4 at. %. The unit cell parameters of the solid solutions with Mo2FeB2-type structure are: a = 0.7627–0.7609(4), c = 0.3905–0.3898(3) nm, V = 0.2272–0.2257(1) nm3 for La2Ni2In1-0.8Ga0-0.2 and a = 0.7530–0.7503(3), c = 0.3722–0.3718(2) nm, V = 0.2110–0.2093(1) nm3 for Ce2Ni2In1-0.8Ga0-0.2. Significant solubility of indium in ternary gallides with Mo2NiB2-type structure under the conditions of the study was not detected.
During the investigation of the components interaction in the R2T2In1-xGax (R = La, Ce) systems less 7 at.% of Gallium solubility in the ternary La2Cu2In and Ce2Cu2In compounds at 870 K was detected. The solid solutions with the Mo2FeB2-type structure can be described by formulas: La2Cu2In1-0.65Ga0-0.35 (a = 0.7737–0.7709(4), c = 0.3924–0.3936(3) nm, V = 0.2349–0.2339(1) nm3) and Ce2Cu2In1-0.65Ga0-0.35 (a = 0.7797–0.7774(3), c = 0.3991–0.3999(3) nm, V = 0.2426–0.2417(1) nm3). The peculiarities of the interaction of components in the studied and related systems are briefly discussed.

Keywords: indium, gallium, powder data, solid solution.

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How to Cite

Dominyuk N., Nychyporuk G., Zaremba V. THE INTERACTION OF THE COMPONENTS IN THE R2T2In1-xGax (R = La, Ce; T = Ni, Cu) SYSTEMS Proc. Shevchenko Sci. Soc. Chem. Sci. 2022 Vol. LXX. P. 69-78.

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