Novel Ternary Intermetallic Compounds R4Ru2Ga3 (R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er)

IF 0.6 4区材料科学 Q4 CRYSTALLOGRAPHY

Crystallography Reports Pub Date : 2024-09-27 DOI:10.1134/S1063774523601570

I. A. Grekhov, Zh. M. Kurenbaeva, E. V. Murashova

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Abstract

A number of new isostructural ternary intermetallic compounds of the composition R₄Ru₂Ga₃ (R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er) were found in ternary R–Ru–Ga systems. The single-crystal X-ray diffraction study of Nd₄Ru₂Ga₃ showed that this compound crystallizes in the monoclinic system and it is a representative of a new structure type (a = 10 Å, b = 4.0533(11) Å, c = 9.720(3) Å, β = 111.080(7)°, space group С2, Z = 2, R1 = 0.043, wR2 = 0.077 for 1518 reflections). The specific structural feature of this compound is the presence of distorted RuNd₆ (AlB₂ type) and GaNd₈ (CsCl type) units. The shortest Nd–Ru distance in the polyhedron is 2.8463(16) Å, which is significantly smaller than the sum of the corresponding atomic radii. The unit cell parameters and volumes in the R₄Ru₂Ga₃ series (R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er) decrease in accordance with lanthanide compression, while their melting points increase.

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新型三元金属间化合物 R4Ru2Ga3（R = Pr、Nd、Sm、Gd、Tb、Dy、Ho、Er）

在 R-Ru-Ga 三元体系中发现了一些新的等结构三元金属间化合物，其组成为 R4Ru2Ga3（R = Pr、Nd、Sm、Gd、Tb、Dy、Ho、Er）。Nd4Ru2Ga3 的单晶 X 射线衍射研究表明，该化合物在单斜体系中结晶，是一种新结构类型的代表（a = 10 Å，b = 4.0533(11) Å，c = 9.720(3) Å，β = 111.080(7)° ，空间群 С2，Z = 2，R1 = 0.043，wR2 = 0.077，共 1518 个反射）。这种化合物的结构特征是存在扭曲的 RuNd6（AlB2 型）和 GaNd8（CsCl 型）单元。多面体中最短的钕-钌距离为 2.8463(16) Å，明显小于相应原子半径之和。R4Ru2Ga3 系列（R = Pr、Nd、Sm、Gd、Tb、Dy、Ho、Er）的单胞参数和体积随着镧系元素的压缩而减小，而它们的熔点却增加了。

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来源期刊

Crystallography Reports 化学-晶体学

CiteScore

1.10

自引率

28.60%

发文量

审稿时长

4-8 weeks

期刊介绍： Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.