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Crystal structure of CaPtZn

  • Jasper Arne Baldauf and Rainer Pöttgen ORCID logo EMAIL logo
Published/Copyright: November 19, 2024

Abstract

CaPtZn, orthorhombic, Pnma (no. 62), a = 7.1072(3) Å, b = 4.3428(2) Å, c = 7.7123(3) Å, V = 238.04(2) Å3, Z = 4, R gt (F) = 0.0195, w R ref (F 2) = 0.0476, T = 293 K.

CCDC no.: 2395482

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

 
View of the CaPtZn structure approximately along the b axis (left). Calcium, platinum and zinc atoms are drawn as medium grey, blue and magenta circles, respectively. The three-dimensional [PtZn] network is emphasized. The right-hand drawing shows the calcium coordination along with relevant interatomic distances (Å).

View of the CaPtZn structure approximately along the b axis (left). Calcium, platinum and zinc atoms are drawn as medium grey, blue and magenta circles, respectively. The three-dimensional [PtZn] network is emphasized. The right-hand drawing shows the calcium coordination along with relevant interatomic distances (Å).

Table 1:

Data collection and handling.

Crystal: Grey
Size: 0.05 × 0.05 × 0.02 mm
Wavelength: Mo Kα radiation (0.71073 Å)
μ: 70.5 mm−1
Diffractometer, scan mode: IPDS Stoe
θ max, completeness: 34.7°, 88 %
N(hkl)measured, N(hkl)unique, R int: 13942, 500, 0.085
Criterion for I obs, N(hkl)gt: I obs > 2σ(I obs), 468
N(param)refined: 20
Programs: X-Area, 1 Jana2020 2
Table 2:

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

Atom x y z U iso*/U eq
Ca 0.01203 (17) 0.25 0.68962 (13) 0.0186 (2)
Zn 0.16005 (11) 0.25 0.07571 (9) 0.01936 (17)
Pt 0.28678 (3) 0.25 0.39503 (3) 0.01821 (7)

1 Source of material

Crystals of the title compound CaPtZn were obtained by a reaction of the elements (1:1:1 atomic ratio) in a sealed tantalum ampoule. Starting materials were calcium granules (Alfa Aesar, 99.5 %), platinum powder (Agosi, 99.9 %) and zinc granules (Merck, 99.9 %). The ampoule was sealed in a silica tube for oxidation protection and heated within 1 h to 1,373 K. The temperature was then reduced to 1,123 K within 24 h and kept for another 110 h followed by quenching. The sample was fully recovered from the ampoule by mechanical fragmentation and kept in a Schlenk tube under argon. Polycrystalline CaPtZn is silvery with metallic lustre. The sample showed moderate sensitivity to moisture.

2 Experimental details

Irregularly-shaped CaPtSn crystals were selected from the carefully crushed sample prepared in the tantalum ampoule. The quality of several crystals was first tested on a Buerger camera (equipped with a Fujifilm image plate detection system) through Laue photographs. Single crystal X-ray diffraction was performed at room temperature on a Stoe IPDS-II diffractometer (graphite monochromatized Mo-K α radiation; oscillation mode). A numerical absorption correction was applied. The atomic parameters of isotypic CaPd0·85Zn1.15 3 were taken as starting values and the structure was refined on F 2 with the Jana2020 software package, 2 with anisotropic displacement parameters for all atoms. Refinement of the occupancy parameters in separate series of least-squares cycles revealed full occupancy for all sites, confirming the ideal composition CaPtSn. This is in agreement with an EDX analyses (Zeiss EVO® MA10 scanning electron microscope, CaSiO3, Pt and Zn as standards) of the studied crystal: 35 ± 2 at% Ca: 34 ± 2 at% Pt: 31 ± 2 at% Zn.

3 Comment

CaPtZn crystallizes with the orthorhombic TiNiSi type 4 structure, space goup Pnma. The refined powder lattice parameters of a = 7.114(3), b = 4.339(3), c = 7.705(3) Å and V = 237.8 Å3 show good agreement with the single-crystal data (vide ultra). In accordance with the course of the ionic radii, CaPtZn has a smaller cell volume than the isotypic divalent compounds EuPtZn (252.4 Å3) 5 and SrPtZn (259.9 Å3). 6

The CaPtZn structure derives from the aristotype AlB2. 7 The calcium atoms are coordinated by two tilted and orthorhombically distorted Pt3Zn3 hexagons (see Figure). The strong distortions reduce the number of calcium neighbors to 2 + 2 instead of 6 + 2 for the aristotype. Thus, each calcium atom has coordination number 16, i.e., Ca@Pt6Zn6Ca4. The tilt of the hexagons leads to inter-layer Pt–Zn interactions and thus a three-dimensional [PtZn] network (see Figure) with distorted tetrahedral zinc coordination for the platinum atoms and vice versa. Within this network the Pt–Zn distances range from 260.8–266.2 pm, slightly longer than the sum of the covalent radii 8 of 254 pm for Pt + Zn.

Keeping the Pauling electronegativities (Ca: 1.00, Pt: 2.28, Zn: 1.65) 8 in mind, the calcium atoms as less electronegative species essentially have transferred their valence electrons, enabling the covalent bonding in the [PtZn] network, where the platinum atoms definitely have platinide character. In a first approximation, the electron counting can be written as Ca δ+[PtZn] δ. The Ca–Ca distances of 364.7 and 367.4 pm are much shorter than in fcc calcium (12 × 395 pm 9 ), a consequence of the partial ionization of calcium.

The family of TiNiSi type intermetallics is large. More than 2000 entries are listed in the Pearson database. 10 For a detailed overview on the many facets of this structure type we refer to relevant review articles. 7 , 11 , 12 , 13 , 14


Corresponding author: Rainer Pöttgen, Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany, E-mail:

Acknowledgments

We thank Dipl.-Ing. J. Kösters for the intensity data collection.

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

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

References

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Received: 2024-10-07
Accepted: 2024-11-04
Published Online: 2024-11-19
Published in Print: 2025-02-25

© 2024 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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