Home Physical Sciences La3.65Mg30Sb1.07 as a disordered derivative of Th2Ni17-type structure
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La3.65Mg30Sb1.07 as a disordered derivative of Th2Ni17-type structure

  • Vitalii Nytka , Vasyl Kordan ORCID logo EMAIL logo and Volodymyr Pavlyuk
Published/Copyright: October 6, 2022

Abstract

La3.65Mg30Sb1.07, hexagonal, P63/mmc (no. 194), a = 10.3895(2) Å, c = 10.2547(3) Å, V = 958.61(5) Å3, Z = 1, R gt (F) = 0.0166, wR ref(F 2) = 0.0429, T = 293(2) K.

CCDC no.: 2196100

Table 1 contains crystallographic data and Table 2 contains the list of the atoms including atomic coordinates and displacement parameters.

Table 1:

Data collection and handling.

Crystal: Plate, metallic dark grey
Size: 0.07 × 0.05 × 0.03 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 0.5 mm−1
Diffractometer, scan mode: Xcalibur3, ω-scans
θ max, completeness: 26.4°, >99%
N(hkl)measured, N(hkl)unique, R int: 5875, 407, 0.026
Criterion for I obs, N(hkl)gt: I obs > 2 σ(I obs), 339
N(param)refined: 28
Programs: CrysAlisPRO [1], SHELX [2, 3], publCIF [4], DIAMOND [5]
Table 2:

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2).

Atom x y z U iso*/U eq
La1 0.3333 0.6667 0.7500 0.0154 (2)
La2a 0.0000 0.0000 0.7500 0.0186 (2)
Mg1 0.32751 (13) 0.96714 (16) 0.2500 0.0249 (3)
Mg2 0.16403 (7) 0.32807 (14) 0.52028 (12) 0.0223 (3)
Mg3 0.5000 1.0000 0.5000 0.0197 (4)
Sb1b 0.6667 0.3333 0.6018 (2) 0.025*
Sb2c 0.0000 0.0000 0.8984 (12) 0.027*
Sb3d 0.6667 0.3333 0.7500 0.027*
  1. Occupancies: a = 0.825(3), b = 0.2111(15), c = 0.0395(12), d = 0.034(2).

Source of material

The La10Mg85Sb5 (in at.%) sample was prepared in Ta-crucibles which were placed in a resistance furnace with a thermocouple controller. Heating rate from room temperature to 670 K was equal 5 K per minute. The purity of constituent elements was more than 99.98 wt%. At this temperature the alloy was kept for over two days and then the temperature was increased to 1170 K for over 4 h. The alloy was annealed at this temperature for 12 h and slowly cooled down to room temperature. After mechanical defragmentation of alloy the small prismatic single crystals were isolated for X-ray investigations. The density of alloy was determined using the volumetric method. For ternary phase of La10Mg85Sb5 the measured density is 2.40(5) g/cm3 and this value is less than 2% different from the density calculated from X-ray data.

Experimental details

The crystal structure of the La3.65Mg30Sb1.07 solid solution was studied by single crystal X-ray diffraction (diffractometer Xcalibur Oxford Diffraction). Absorption correction was performed by analytical method. The solution of the crystal structure was carried out by direct methods. In the first stage of structure solution, the positions of La, Mg, and Sb atoms were obtained correctly by direct methods. All Sb atoms partially occupy three sites 4f, 4e and 2c. The refinement of the structure model with La2—Sb2 and Sb1—Sb3 split atoms leads to sharp reduction in the value of conventional R index.

Discussion

In our previous work [6] we investigated La3.65Mg30Sn1.10. In this work we studied the Sb-containing phase with a similar crystal structure. The solubility of antimony and tin in the binary La2Mg17 intermetallic compound, studied by XRD and EDX-analysis, reaches 4–5 at.%, because similar atomic radii (r Sb = 1.59 Å, r Sn = 1.62 Å). Both phases are related to the Th2Ni17 and parental CaCu5-type structure and demonstrate hydrogen sorption ability [6]. Mg-based intermetallics as hydrogen sorption material and negative electrodes in Ni–MH batteries are described in refs. [7, 8]. La3.65Mg30Sb1.07 is strongly disordered due to the presence of mutually excluding atoms and split positions. Therefore, in the average structure two sub-cells (A and B) can be selected. In the average structure the fraction ratio of sub-cells A to sub-cells B is 4:1 (Figure). Sub-cell A, which contains La1, La2, Mg1, Mg2, Mg3 and Sb1 has the composition La4Mg30Sb4 or La2Mg15Sb2 (for Z = 2) corresponding to the structure type Ce2Mg15Fe2 [9], which is an ordered superstructure to Th2Ni17-type. Sub-cell B contains the La1, Mg1, Mg2, Mg3, Sb2 and Sb3 atoms. The La2–Sb2 and Sb1–Sb3 atoms mutually exclude each other. The projection of the A and B unit cells are shown in the figure. Detailed crystal chemical analysis shows that La1 and La2 atoms are enclosed in pseudo–Frank–Kasper polyhedra [La1Mg18Sb20] and [La2Mg18], respectively. For all Mg and Sb3 atoms typical is icosahedral coordination. The Sb1 and Sb2 atoms formed the 14-vertex polyhedra [Sb1Mg12SbLa] and [Sb2Mg12Sb2]. These type of polyhedra and values of interatomic distances are similar to other known Mg-based intermetallics [10], [11], [12].


Corresponding author: Vasyl Kordan, Department of Inorganic Chemistry, Ivan Franko Lviv National University, Kyryla, and Mefodiya Str., 6, 79005, Lviv, Ukraine, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

References

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Received: 2022-08-12
Accepted: 2022-09-21
Published Online: 2022-10-06
Published in Print: 2022-12-16

© 2022 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

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