| | 1 | Author
| KurtO. Klepp | Requires cookie* | | | Title
| Darstellung und Kristallstruktur von NaCu 3 Te 2 Preparation and Crystal Structure of NaCu 3 Te 2  | | | | Abstract
| The title compound was prepared by reacting a corresponding mixture of Na 2 Te 2 , copper and tellurium at 700 °C. NaCu 3 Te 2 forms crystals of metallic lustre which are rapidly decomposed in humid atmosphere. It crystallizes with a rhombohedral structure, space group R3m, with a — 4.276(3) Ä, c = 23.78(1) Ä. Z = 3. The crystal structure was determined from diffractometer data and refined to a conventional R of 0.050 for 135 independent reflections. The atomic arrangement of NaCu 3 Te 2 is based on a c.c.p. array of tellurium atoms with stacking sequence c 6 . Na and Cu occupy alternatingly the interstitial layers. Na is in an octahedral coordi-nation (d Na _ Te : 3.22 A), the Cu atoms occupy the tetrahedral and the octahedral voids. They are, however, shifted from the centers of these sites, resulting in an 1 + 3 coordination (d Cu _ Te : 2.70 Ä) for Cu on the tetrahedral. and an essentially trigonal coordination (d Cu Xe : 2.575 A) for Cu on the octahedral sites. NaCu 3 Te 2 shows no closer structural relationships to the other alkali-copper-chalcogenides known so far. However, its crystal structure may be interpreted as an ordered defect derivative structure of the CaCu 4 P 2 -type [1]. | | | |
Reference
| (Z. Naturforsch. 42b, 130—134 [1987]; eingegangen am 11. April 1986) | | | |
Published
| 1987 | | | |
Keywords
| Ternary Chalcogenides, Sodium Copper Telluride, Crystal Structure, Preparation | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/42/ZNB-1987-42b-0130.pdf | | | | Identifier
| ZNB-1987-42b-0130 | | | | Volume
| 42 | |
|
