Darstellung und Kristallstruktur des K5Te3 / Preparation and Crystal Structure of K5Te3
2014
Schewe, I. | Böttcher, P.
The structure of the first of the new alkali metal chalcogenides of the composition M₅X₃ has been solved (K₅Te₃: a = 13.742(2)Å, c = 6.364(2) Å, space group: I 4/m, Z = 4). It can be derived from the W₅Si₃ type of structure by substituting the · · · Si · · · Si · · · Si · · · chains by those of Te₂²⁻-dumbbells · · · (Te–Te) · · · (Te–Te) · · · (Te–Te) · · · , both running along [001]. The Te₂²⁻-dumbbells occur as a consequence of the necessity of charge compensation of the saltlike compound K₅Te₃, according to 2 K₅Te₃ ⇌ 10 K⁺ + Te₂²⁻ + 4 Te²⁻. The remaining tellurium atoms not involved in the dumbbells build up strings of tetrahedra ∞¹[ΚΤe₄/₂], with common edges along [001]. Therefore, the resulting K–K distances in these strings of tetrahedra are extremely short (3.18 A).
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library