1979
DOI: 10.1515/znb-1979-0308
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Na3Cu4S4-ein Thiocuprat mit unverknüpften 1 [Cu4S4] -Ketten / Na3Cu4S4-a Thiocuprate with Isolated 1 [Cu4S4]-Chains

Abstract: Abstract Na3Cu4S4 can be prepared by fusion reaction of copper with Na2CO3 and sulfur at 600 °C. The structure (orthorhombic, Pbam, a= 14,624(6), 6 = 7,163(3), c = 3,771(1)Å; Z = 2) solved from x-ray diffractometer data (R = 0,024; 391 obs. reflections) shows unlinked copper-sulfur chains of the kind already observed in two-dimensional copper-sulfur networks.

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Cited by 48 publications
(13 citation statements)
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“…T h e m a t e r i a l c a n b e f o r m u l a t e d a s [(Cu 1+ ) 5 (Sn 4+ ) 2 (Te 2− ) 7 ](p + ). This situation is similar to that found in CuS, 61,62 NaCu 4 S 4 , 23 or Na 3 Cu 4 S 4 , 3,63 where all are well-known p-type metallic mixed-valence compounds. To further validate the nature of mixed valency several studies including spectroscopic (XPS), physical properties (electronic conductivity, Seebeck, and Hall effect), and electronic band structure calculations were undertaken.…”
Section: ■ Experimental Sectionsupporting
confidence: 84%
“…T h e m a t e r i a l c a n b e f o r m u l a t e d a s [(Cu 1+ ) 5 (Sn 4+ ) 2 (Te 2− ) 7 ](p + ). This situation is similar to that found in CuS, 61,62 NaCu 4 S 4 , 23 or Na 3 Cu 4 S 4 , 3,63 where all are well-known p-type metallic mixed-valence compounds. To further validate the nature of mixed valency several studies including spectroscopic (XPS), physical properties (electronic conductivity, Seebeck, and Hall effect), and electronic band structure calculations were undertaken.…”
Section: ■ Experimental Sectionsupporting
confidence: 84%
“…These compounds host phase transitions, modulated superlattices, , and massive copper vacancies , and are of interest in energy harvesting and conversion, including but not limited to solid-state supercapacitors , and ionic conductors . All structural dimensionalities are found in this class, for example, the one-dimensional (1D) Na 3 Cu 4 S 4 , , the two-dimensional (2D) ACu 4 Q 3 (A = Na, K, Rb, Cs, Tl; Q = S, Se), , NaCu 4 S 4 , A 4 Cu 8 Te 10 (A = Rb, Cs), NaCu 6 Se 4 , and TlCu 2 Se 2 , and the three-dimensional (3D) K 4 Cu 8 Te 11 and Cs 3 Cu 20 Te 13 , to name a few. Generally, they can be classified by the electronic structures and have two different general categories: mixed-valent and valence-precise compounds.…”
Section: Introductionmentioning
confidence: 99%
“…Among the many known copper chalcogenides are several unusual phases that feature monochalcogenides with a −1 charge without formation of chalcogen–chalcogen bonds. These occur in ternary (e.g., ACu 4 Q 3 (A = K, Rb, Cs, and Tl; Q = S and Se), TlCu 2 Q 2 (Q = S and Se), Na 3 Cu 4 S 4 , , NaCu 6 Se 4 , and K 2 Cu 5 Te 5 ) and quaternary (e.g., K 2 Cu 2 CeS 4 , CsCuCeS 3 , K 2 Cu 2 Sn 2 S 6 , KCuS 4 , and K 6 Cu 12 U 2 S 15 ) systems. In the past, when many of these phases were discovered, the presumption was that the mixed valency had arisen because of the Cu 2+ /Cu + states .…”
Section: Introductionmentioning
confidence: 99%