Zur Kenntnis intermetallischer Phasen des Lithiums mit Zink (bzw. Cadmium, Indium) sowie Zinn oder Blei / A Contribution to the Knowledge of Ternary Intermetallic Lithium-Phases with Zinc (resp. Cadmium and Indium) and Tin or Lead

Abstract

<jats:title>Abstract</jats:title><jats:p> By phase analysis in the ternary systems Li-Zn(Cd or In)-Sn(Pb) several nonvalent cubic phases were found. Structure deter-mination on Li<jats:sub>7.72</jats:sub>Zn<jats:sub>4.28</jats:sub>Sn<jats:sub>4</jats:sub> showed that the phases crystallize in a modified NaTl-type-lattice.</jats:p>

Lithium-Stuffed Diamond Polytype Zn–Tt Structures (Tt = Sn, Ge): The Two Lithium–Zinc–Tetrelides Li3Zn2Sn4 and Li2ZnGe3

“…They are in the range of distances found for covalently bonded Sn polyanions such as in the Zintl phase NaSn 2 (2.822(1)–2.975(2) Å) or the covalent substructure in NaSn 5 (2.794(1)–2.886(1) Å). The Zn–Sn distances (2.690(1) and 2.786(1) Å) are also slightly longer than the sum of covalent radii (2.61 Å; according to ref ) and match the Zn–Sn distances in the network of four-connected Zn and Sn atoms in Na 5 Zn 2.28 Sn 9.72 (2.717(1)–2.840(1) Å) and the interatomic distance for cubic Li 2 ZnSn (2.792 Å) …”

“…8 and the interatomic distance for cubic Li 2 ZnSn (2.792 Å). 21 In the structure model for Li 2 ZnGe 3 there is only one mixed occupied Ge/Zn site (4f) for the atoms in the 2H diamond polytype like network structure (Figure 3). The interatomic distance within the puckered layers of six-membered rings is 2.526(1) Å, and the interlayer bond length is 2.608(1) Å.…”

“…α - Li 2 ZnGe can be described as an electron-precise Zintl phase, which features a cubic zinc blende like Zn–Ge network stuffed with Li, that is, a structure closely related to the pristine NaTl structure type. Two other phases have been identified in the system, but their structures have not been (fully) determined. , In the Li–Zn–Sn system, the phase Li 2 ZnSn, , which also adopts a NaTl type related structure, is known. With the heavier alkali metals, only a few A–Zn–Ge phases (A = alkali metal) have been reported, including Na 2 ZnGe, which adopts a (Na 2 CuAs type) structure that is completely different from that of Li 2 ZnGe, featuring {Zn–Ge} zigzag chains with linearly coordinated Zn atoms .…”

SrZn2Sn2 and Ca2Zn3Sn6 — two new Ae–Zn–Sn polar intermetallic compounds (Ae: alkaline earth metal)

“…Generally, they can be described in terms of A, Ae, or R cations and an overall negatively charged Zn-Sn structure part (electronegativities (EN) of Zn and Sn: Pauling scale: EN(Zn)¼1.6, EN(Sn)¼1.8; Allred-Rochow: EN(Zn)¼1.66, EN(Sn) ¼1.72; [1]). With the light alkali metals, Li 2 ZnSn [2,3] and a number of Na-Zn-Sn phases with a rich diversity of polyanionic Zn-Sn substructures are known. The latter include isolated {Sn-Zn-Sn} units [4], networks of fourbonded Zn and Sn atoms [5], and networks of interconnected icosahedral Zn-Sn clusters combined with other structure motifs (clusters or others) [6,7].…”

Synthesis, Crystal Structure, and High-Temperature Phase Transition of the Novel Plumbide Na2MgPb

“…Eight crystal structure types have been reported for intermetallic compounds with the general formula A 2 MeTt, where A denotes an alkali metal (Li, Na, K), Me is a group-12 element (Zn, Cd, Hg), and Tt stands for one of the tetrels (Si, Ge, Sn, Pb). − These solid-state phases are known for their structural versatility: Me and Tt atoms may connect in those structures to form one-dimensional (1D) chains (K 2 CdSn-type and Na 2 CuAs-type), two-dimensional (2D) layers (Li 2 CuAs-type and Li 2 ZnSi-type), and also three-dimensional (3D) frameworks; the latter are seen in the inverse Heusler-type (Li 2 AgSb-type), the regular Heusler-type (Cu 2 MnAl-type), as well as the Na 3 As- and Li 3 Bi-type. In these structures, the alkali metal atoms (A) are located between the chains and layers, or within structural voids in the Me/Tt frameworks.…”