Thiocuprates—Interesting anisotropic solids

Boller, H.

doi:10.1016/j.jallcom.2006.09.142

Cited by 24 publications

(8 citation statements)

References 68 publications

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“…Determination of the charge state of copper in chalcogenides is a complex problem because of the highly covalent character of the Cu-Q bonds (Q = S, Se, Te) and the comparable energies of Cu d and Q p orbital states. There is general agreement that the mixed valence is generated mainly by oxidation of the chalcogen sublattice and not of copper(I), the maximal oxidation number per chalcogen atom varies from −2 (without chalcogen-chalcogen bonding) to ∼−1.5 . Thus, virtually all valence-precise copper chalcogenides are semiconductors, whereas mixed-valent copper chalcogenides possess metallic conductivity.…”

Section: Introductionmentioning

confidence: 91%

NaBa₂Cu₃S₅: A Doped p-Type Degenerate Semiconductor

et al. 2013

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Mixed S(2-/)S(1-) oxidation states have been discovered in the new quaternary compound NaBa2Cu3S5. Synthesized from the reaction of Cu in a molten alkali metal/polysulfide flux, the compound crystallizes in monoclinic space group C2/m with a = 16.5363(7) Å, b = 5.5374(5) Å, c = 10.3717(10) Å, β = 98.535(8)°. The Na(+) Ba2(+2) [Cu(+)3S3](3-)S2(2-) crystal structure contains layers of edge sharing CuS4 tetrahedra and sheets of S2(2-) dimers. These layers are separated by mixed Ba/Na cation layers. The conductivity of the single crystals of NaBa2Cu3S5 is ∼450 S cm(-1) at room temperature, and increasing conductivity with decreasing temperature is observed, indicating metallic behavior despite the optical band gap of 0.45 eV. A small positive thermopower (45-55 μV K(-1) from 300 K to 500 K) and Hall effect measurements also confirm p-type conductivity with carrier concentration at 200 K of ∼1.6 × 10(21) cm(-3) and a hole mobility of ∼2 cm(2) V(-1) s(-1). NaBa2Cu3S5 exhibits temperature-independent Pauli paramagnetism.

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Section: Introductionmentioning

confidence: 91%

NaBa₂Cu₃S₅: A Doped p-Type Degenerate Semiconductor

et al. 2013

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“…Three bands at 300 (Cu-S stretching), 103 and 86 cm -1 (Ca-S stretching) are observed in the dzierżanowskite spectrum. The composition, EBSD pattern and Raman spectrum of dzierżanowskite confirm that it is the natural analogue of synthetic CaCu 2 S 2 (Purdy, 1998), which belongs to a group of thiocuprates characterized by the formula [ Boller, 2007). These thiocuprates possess a CaAl 2 Si 2 structure type (Condron et al, 2007).…”

Section: Ebsd and Raman Data For Dzierżanowskitementioning

confidence: 67%

“…Dzierżanowskite, CaCu 2 S 2 , belongs to the thiocuprate group of minerals (Boller, 2007); its synthetic analogue (Purdy, 1998), related to the structural type CaAl 2 Si 2 , is known (Condron et al, 2007). Chvilevaite Na(Cu,Fe,Zn) 2 S 2 , is the only mineral of note among the natural phases (Kachalovskaya et al, 1988), characterised by a structure similar to dzierżanowskite.…”

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confidence: 99%

Dzierżanowskite, CaCu₂S₂ – a new natural thiocuprate from Jabel Harmun, Judean Desert, Palestine Autonomy, Israel

et al. 2017

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Dzierżanowskite, , a thiocuprate, was found in larnite pseudoconglomerate rocks of the Hatrurim Complex at Jabel Harmun, Palestinian Autonomy, Israel. Dzierżanowskite occurs in larnite pebbles, which are embedded in a low-temperature mineral matrix. Associated minerals are larnite, brownmillerite, fluorellestadite, ye'elimite, gehlenite, periclase, ternesite, nabimusaite, vorlanite, vapnikite, fluormayenite, fluorkyuygenite, oldhamite, jasmundite, covellite, chalcocite and pyrrhotite. Electron microprobe analyses yield an average composition of Cu 55.25, Fe 0.13, S 27.46 and Ca 16.99, total 99.83 wt.%. The empirical formula of dzierżanowskite, based on 5 atoms, is Ca0.98Cu2.02Fe0.01S1.99. Dzierżanowskite forms grains up to 15 μm in size or rims on oldhamite and laminar intergrowths with chalcocite and covellite. Dzierżanowskite is dark orange, has a cream streak and a submetallic lustre. In reflected light it is grey, with a cream tint and characteristic yellow-orange internal reflections. The calculated density of dzierżanowskite is 4.391 g cm -3. Three bands at 300, 103 and 86 cm -1 are observed in the Raman spectrum. The strongest lines of the calculated powder diffraction pattern are [d, Å (I) hkl]: 2.358(100) 102, 1.970(93)110, 3.023(78) 011, 6.523(36) 001, 3.412 (28) 100, 1.834(28) 103. Dzierżanowskite was also found in unusual jasmundite rocks, forming small ‘paleofumaroles’ within areas of low-temperature hydrothermal rocks bearing larnite pseudoconglomerates at Jabel Harmun. Dzierżanowskite is a superimposed phase of the high-temperature alteration of pyrometamorphic rocks subjected to by-products (melts/fluids and gases) of pyrometamorphism originating in the deeper levels of combustion.

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“…It has attracted much research interest since it exists in a variety of composition and has various crystallographic structures as well as unique physical and chemical properties because of the different coordinations copper can adopt, which merits intensive experimental and theoretical studies of transport phenomena of lowdimensional solids. 12 For example, the well-known phases in the K-Cu-S system include KCuS, 13 KCu 4 S 3 , 14,15 K 3 Cu 8 S 6 , 16,17 , respectively. Each contains Cu 4 S 4 columns, in which copper is three-coordinate with respect to sulphur atoms while the Cu + cation outside the Cu 4 S 4 column is fourcoordinate.…”

Section: Introductionmentioning

confidence: 99%

n-Type KCu₃S₂microbelts: optical, electrical, and optoelectronic properties

Wang

et al. 2014

RSC Adv.

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Thiocuprates—Interesting anisotropic solids

Cited by 24 publications

References 68 publications

NaBa₂Cu₃S₅: A Doped p-Type Degenerate Semiconductor

NaBa₂Cu₃S₅: A Doped p-Type Degenerate Semiconductor

Dzierżanowskite, CaCu₂S₂ – a new natural thiocuprate from Jabel Harmun, Judean Desert, Palestine Autonomy, Israel

n-Type KCu₃S₂microbelts: optical, electrical, and optoelectronic properties

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Thiocuprates—Interesting anisotropic solids

Cited by 24 publications

References 68 publications

NaBa2Cu3S5: A Doped p-Type Degenerate Semiconductor

NaBa2Cu3S5: A Doped p-Type Degenerate Semiconductor

Dzierżanowskite, CaCu2S2 – a new natural thiocuprate from Jabel Harmun, Judean Desert, Palestine Autonomy, Israel

n-Type KCu3S2microbelts: optical, electrical, and optoelectronic properties

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NaBa₂Cu₃S₅: A Doped p-Type Degenerate Semiconductor

NaBa₂Cu₃S₅: A Doped p-Type Degenerate Semiconductor

Dzierżanowskite, CaCu₂S₂ – a new natural thiocuprate from Jabel Harmun, Judean Desert, Palestine Autonomy, Israel

n-Type KCu₃S₂microbelts: optical, electrical, and optoelectronic properties