Structure du conducteur ionique (LaO)AgS

Palazzi, M.; Jaulmes, S.

doi:10.1107/s0567740881005876

Cited by 63 publications

(40 citation statements)

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“…LaOAgS, LaOFeAs, and LaOCuS would need higher processing temperatures [1,6,7]. Single phase material was obtained at 500 • C, after preliminary calcination at 400 and 450 • C with intermediate grinding (see Fig.1).…”

Section: Methodsmentioning

confidence: 99%

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BiOCuS: A new superconducting compound with oxypnictide-related structure

Ubaldini

Giannini

Senatore

et al. 2010

Physica C: Superconductivity and its Applications

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The discovery of about 50 K superconductivity in the tetragonal Fe-based pnictides has stimulated the search for superconductivity in a wide class of materials with similar structure. Copper forms compounds isostructural to LaOFeAs. Single phase BiOCuS can be prepared by a solid state reaction at temperature lower than 500 • C from a mixture of Bi 2 O 3 , Bi 2 S 3 and Cu 2 S. The samples have been characterized by means of EDX analysis, X-ray diffraction, magnetic and electrical measurements. The cell parameters are a = 3.8708 Å, c = 8.565 Å. Charge carrier doping can be realized either by F substitutions for O, or by Cu off-stoichiometry. The latter doping route leads to the occurrence of superconductivity below T c = 5.8 K.

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Section: Methodsmentioning

confidence: 99%

“…The second one is a superconductor (T c = 7 K). Silver forms compounds isostructural to LaOFeAs with S and Se [6]. This suggests that some other compounds isostructural to LaOFeAs may exhibit superconductivity if properly doped.…”

Section: Introductionmentioning

confidence: 99%

BiOCuS: A new superconducting compound with oxypnictide-related structure

Ubaldini

Giannini

Senatore

et al. 2010

Physica C: Superconductivity and its Applications

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“…The compounds¸nCuOQ (¸n"rare earth element; Q"S, Se) (4}7) are known. These belong to the LaAgOS structure type (4) …”

Section: Introductionmentioning

confidence: 99%

Synthesis, Structure, Electrical Conductivity, and Band Structure of the Rare-Earth Copper Oxychalcogenide La5Cu6O4S7

Huang

Brazis

Kannewurf

et al. 2000

Journal of Solid State Chemistry

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“…Auch u È ber die Kristallstrukturen quaterna È rer Kupfer(I)-Selten-Erd(III)-Chalkogenide mit zwei unterschiedlichen Chalkogenid-Anionen (z. B. CuMOS [6], CuMOSe [7], CuMOTe [7] im AgLaOS-Typ [8] sowie zwei Formen von CuMSTe (M = La, Sm) [9]) ist bereits berichtet worden. Von einem unerwarteten Nebenprodukt (CuPrOS [10] …”

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CuPrOS: Kein einprägsames Akronym, vielmehr ein echtes quaternäres Chalkogenid mit aufgefüllter PbFCl-Struktur

Lauxmann

Schleid

2000

Z. anorg. allg. Chem.

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During attempts to synthesize copper(I) praseodymium(III) disulfide (CuPrS 2 ) from 1 : 1 : 2-molar mixtures of the elements (Cu, Pr and S) after seven days at 850°C in sealed evacuated silica tubes the almost quantitative formation of the quaternary chalcogenide CuPrOS indicated that some massive oxygen-contaminant (most probably surfaceoxidized praseodymium metal) must have been present. The unexpected product becomes even single-crystalline and emerges as yellowish green transparent platelets with square cross-section when equimolar amounts of CsCl work as fluxing agent. The crystal structure of CuPrOS (tetragonal, P4/nmm; a = 394.19(4), c = 843.98(9) pm; c/a = 2.141, Z = 2) can be described as an anionic PbFCl-type arrangement according to 2Pr 3+ in squareantiprismatic coordination of four F ± and four S 2± anions which is ªstuffedº by Cu + cations within tetrahedral interstices between the S 2± double layers for charge balance. Another description emphasizes two kinds of layers (anionic 2 I {[(Cu + )(S 2± ) 4/4 ] ± } and cationic 2 I {[(O 2± )(Pr 3+ ) 4/4 ] + } ones) consisting of condensed [(Cu + )(S 2± ) 4 ] 7± and [(O 2± )(Pr 3+ ) 4 ] 10+ tetrahedra, respectively, each of which share four of their six edges. Both types of square layers exhibit the same topology and are alternatingly sheethed parallel (001). The most important internuclear distances range from 233 (d(O±Pr), 4´) via 243 (d(Cu±S), 4´) up to 320 pm (d(Pr±S), 4´). Aufgrund ihres Potentials als Cu + -Kationenleiter sind terna È-re Kupfer(I)-Selten-Erd(III)-Sulfide der Zusammensetzung CuMS 2 (M = Sc, Y, La; Ce±Lu [1, 2]; Strukturtypen: A-CuLaS 2 (monoklin, P2 1 /c) [3], B-CuYS 2 (orthorhombisch, Pnma) [4] und C-CuScS 2 (trigonal, P3m1) [5]) immer wieder Gegenstand von Forschungsaktivita È ten gewesen. Auch u È ber die Kristallstrukturen quaterna È rer Kupfer(I)-Selten-Erd(III)-Chalkogenide mit zwei unterschiedlichen Chalkogenid-Anionen (z. B. CuMOS [6], CuMOSe [7], CuMOTe [7] im AgLaOS-Typ [8] sowie zwei Formen von CuMSTe (M = La, Sm) [9]) ist bereits berichtet worden. Von einem unerwarteten Nebenprodukt (CuPrOS [10] isotyp mit CuLaOS [6]) bei Versuchen zur Synthese von CuPrS 2 [11] unter sauerstoffkontaminierten Bedingungen handelt nachfolgender Kurzartikel. Experimentelles Bei der Umsetzung von elementarem Kupfer (Aldrich; 99,999%) und Praseodym (Heraeus-ChemPur; 99,99%) mit Schwefel (Alfa-Aesar Johnson-Matthey; 99,9995%) in evakuierten, gasdicht abgeschmolzenen Quarzglasampullen (850°C, 7 d; molares Verha È ltnis: Cu : Pr : S = 1 : 1 : 2; Zusatz von a È quimolaren Mengen an CsCl (E. Merck; suprapur) als Fluûmittel) entsteht durch den Einsatz von oberfla È chlich oxidiertem Praseodym an Stelle des erhofften Zielproduktes CuPrS 2 nahezu quantitativ eine gelbgru È ne Substanz in Form von luft-und hydrolyseunempfindlichen, du È nnen, pla È ttchenfo È rmigen Einkristallen mit quadratischem Querschnitt. Nach Ausweis der Ro È ntgenstrukturanalyse handelt es sich dabei

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Structure du conducteur ionique (LaO)AgS

Cited by 63 publications

References 1 publication

BiOCuS: A new superconducting compound with oxypnictide-related structure

BiOCuS: A new superconducting compound with oxypnictide-related structure

Synthesis, Structure, Electrical Conductivity, and Band Structure of the Rare-Earth Copper Oxychalcogenide La5Cu6O4S7

CuPrOS: Kein einprägsames Akronym, vielmehr ein echtes quaternäres Chalkogenid mit aufgefüllter PbFCl-Struktur

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