Аннотация:Currently, intensive research is being conducted on intermetallic compounds (IMCs) of rare earth elements with significant electron correlations. In particular, such IMCs include R–T–X systems, where R stands for a rare-earth element, T - d-element, and X - p-element(groups 13–15). Intermetallic compounds (IMCs) in ternary R–T–X systems can exhibit specific physical properties such as the formation of Kondo lattices, heavy-fermion superconductivity, valence fluctuations, and others. In the case where the d-element is palladium, the formation of IMCs with a high Pd content (> 70 at. %) is possible, which distinguishes it from other platinumgroup metals. The alloys were prepared in an electric arc furnace under an argon atmosphere, followed by annealing at 800 °C in evacuated quartz ampoules using resistance furnaces for 14 days. The samples were studied using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray phase analysis, and differential thermal analysis. The existence of two new ternary compounds containing 33.3 at. % lanthanum has been established: La(Pd,Ga)₂, with the KHg₂-type structure (space group Imma), and La₃Pd₅Ga, with the Ce₃Pd₅Si-type structure (space group Imma). The crystal structure of the La(Pd,Ga)₂ phase can be described as a set of overlapping triangular. A similar structural motif is also observed in the lanthanum sublattice of the La₃Pd₅Ga compound. This is consistent with the data from the work on the crystal structure of ternary halides Ce(Pd,Ga)2 and Ce3Pd5Ga. The structural similarity of analogous compounds of the systems La-Pd-Ga and Ce-Pd-Ga will allow us to evaluate the influence of 4f-electrons on the properties of ternary R–T–X compounds.
