New Ternary Bismuthides NaZnBi and NaCdBi: Synthesis and Crystal Structures
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Ternary Bismuthides NaZnBi and NaCdBi: Synthesis and Crystal Structures A. I. Shilova, b, *, K. S. Pervakovb, V. A. Tafeenkoa, and I. V. Morozova, ** a
bGinzburg
Moscow State University, Moscow, 119991 Russia Center for High-Temperature Superconductivity and Quantum Materials, Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia *е-mail: [email protected] **е-mail: [email protected] Received December 10, 2019; revised February 20, 2020; accepted March 25, 2020
Abstract—Single crystals of new ternary bismuthides NaZnBi (I) and NaCdBi (II) are obtained by the selfflux technique. Its crystal structures are studied by single-crystal X-ray structure analysis (CIF file CCDC nos. 1956988 (I) and 1956989 (II)). The synthesized compounds form isostructural series with lighter pnictide analogs. Similarly to NaZnPn (Pn = P, As, Sb), compound I crystallizes in the structural type PbFCl, space group P4/nmm, a = 4.5114(5), c = 7.5970(10) Å, whereas compound II, as NaCdPn (Pn = As, Sb), can be assigned to the structural type MgSrSi, space group Pnma, a = 8.0812(5), b = 4.8026(3), c = 8.7320(7) Å. The crystal structure of compound I consists of antifluorite-like layers [ZnBi] separated by a layer of sodium atoms, whereas hexagonal corrugated [CdBi] layers, which are tightened between each other by Cd–Bi bonds with the formation of channels in which sodium atoms are localized, can be distinguished in the structure of compound II. The crystal structures of the synthesized bismuthides are compared both between each other and with lighter representatives of the isostructural series. Keywords: ternary bismuthides, NaZnBi, NaCdBi, single crystal growth, X-ray structure analysis, crystal structure DOI: 10.1134/S1070328420090043
INTRODUCTION Compounds of the general composition ATPn (A is alkaline metal, T is d element, and Pn is pnictide) manifest a large variety of structures and properties due to the formation of diverse coordination polyhedra by the component atoms and their mutual arrangement. Among them there are insulators, semiconductors, compounds with metallic behavior, and superconductors. They can exhibit thermoelectric and diverse magnetic properties. The most known materials are layered iron-containing superconductors AFePn (Pn = P, As; A = Li, Na) that crystallize in the structural type PbClF (space group P4/nmm) [1], a wide family of manganese derivatives AMnPn (A is alkaline metal, Cu; Pn = P, As, Sb, Bi) manifesting the properties of semiconductor antiferromagnetics [2–4], and half-Heusler compounds characterized by the antifluorite-like structure (space groups Fm 3 m and F 4 3m) and manifesting various physical properties, including those caused by the non-trivial Fermi surface topology [5]. The family of layered pnictides ATPn is of special interest. They contain hexagonal layers [TPn] built of alternating T and Pn atoms and A atoms arranged between these layers (family ZrBeSi,
space group P63/mmc), and the layers can be tightened by interlayer T–Pn bonds to form framework centroor n
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