PHASE EQUILIBRIA IN THE QUATERNARY SYSTEM LA-LI-NI-GE AT A TEMPERATURE OF 400 °С
DOI:
https://doi.org/10.32782/pcsd-2025-1-7Keywords:
Lanthanum, Lithium, Nickel, Germanium, phase equilibria, synthesis, structure, solid solutionAbstract
In the work, using X-ray, phase and structural analyses and energy dispersion X-ray spectroscopy, the interaction of components in the La-Li-Ni-Ge system in the LaGe-LiGe-NiGe-Ge region was studied. The alloys were obtained by melting stoichiometric amounts of constituent elements and then annealing at 400 °C for 480 hours. Identification, calculation and indexing of diffractograms, refinement of parameters of elementary cells was carried out using packages of LATSON, POWDER CELL-2.3 programs. and WinCSD. Determination and refinement of the crystal structure by the powder method was performed using the FullPro program. For experimental determination of the amount of Lithium used the method of flame photometry. o confirm the phase composition of a number of the obtained system samples, the method of energy-dispersive X-ray spectroscopy (EDX) was used. In the experimentally studied area, for the first time, it was found that on the section between the triple compounds of LaLiGe2 and LaNiGe2 there are limited solid solutions of substitution of LaLixNi1 - xGe2 compounds (x = 0–0.31) (structural type SeNiSi2, Pearson symbol oS16, space group Cmcm, a = 0.4307–0.4309; b = 1.6905–1.6919; c = 0.4237–0.4239 nm) and LaLi1 - xNixGe2 (x = 0–0.32) (structural type CaLiSi2, Pearson symbol oP16, space group Pnma, a = 0.7851–0.7836; b = 0.4010–0.3997; c = 1.0884–1.0866 nm). Based on the ternary phase of the La2LiGe6, the minimum solubility of Nickel was established and, accordingly, the formation of a solid solution of the composition of La2Li1 - xNixGe6 (x = = 0–0.24) (structural type Pr2LiGe6, Pearson symbol oS18, space group Cmmm, a = 0.4187–0.4185; b = 2.1113–2.1110; c = 0.4391–0.4390 nm). The boundaries of the detected solid solutions were established according to the graphs of the change in the volume of elementary cells when replacing Lithium with Nickel and vice versa. The existence of five ternary compounds (LaNiGe2, LaNiGe3, LaNi0.5Ge1.5, LaLiGe2, La2LiGe6) is confirmed. Quaternary compounds of point composition are not formed in the region of the experiment.
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