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'Ternary Chalcogenides' in keywords Facet   Publication Year 1987  [X]
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1987[X]
1Author    KurtO. KleppRequires 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 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0130.pdf 
 Identifier    ZNB-1987-42b-0130 
 Volume    42