Alkalithio‐ und ‐selenoverbindungen der Übergangselemente. III. Strukturuntersuchungen an Alkalithiocupraten

Rüdorff, W.; Schwarz, Hans George; Walter, Marianne

doi:10.1002/zaac.19522690308

Cited by 82 publications

(28 citation statements)

References 3 publications

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“…If such a material came out, higher T c could be expectable. It is noted here that the same structure already exists (e.g., KCu 4 S 3 [116]). …”

Section: B Examples Of Structural Designsupporting

confidence: 56%

Crystal chemistry and structural design of iron-based superconductors

Jiang¹,

Sun²,

Xu³

et al. 2013

Chinese Phys. B

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The second class of high-temperature superconductors (HTSCs), iron-based pnictides and chalcogenides, necessarily contain Fe2X2 ("X" refers to a pnictogen or a chalcogen element) layers, just like the first class of HTSCs which possess the essential CuO2 sheets. So far, dozens of iron-based HTSCs, classified into nine groups, have been discovered. In this article, the crystal-chemistry aspects of the known iron-based superconductors are reviewed and summarized by employing "hard and soft acids and bases (HSAB)" concept. Based on these understandings, we propose an alternative route to exploring new iron-based superconductors via rational structural design.

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“…If such a material came out, higher T c could be expectable. It is noted here that the same structure already exists (e.g., KCu 4 S 3 [116]). …”

Section: B Examples Of Structural Designsupporting

confidence: 56%

Crystal chemistry and structural design of iron-based superconductors

Jiang¹,

Sun²,

Xu³

et al. 2013

Chinese Phys. B

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“…Es ist bekannt, daß durch Schmelzen von Gemengen aus Alkalicarbonat, Kupfer und Schwefel Alkalithiocuprate erhalten werden können [1][2][3].…”

Section: Darstellungunclassified

“…Alkalikomponente wird in der Literatur jedoch nur die Phase Na2Cu3S3 erwähnt [1,2]. Durch einstündi-ges Erhitzen auf 600 °C gelang jetzt die Synthese von Na3Cu4S4, ausgehend von einem Gemenge der genannten Komponenten im Gewichtsverhältnis …”

Section: Von Den Denkbaren Verbindungen Mit Natrium Alsunclassified

Na₃Cu₄S₄-ein Thiocuprat mit unverknüpften ¹ _∞[Cu₄S₄] -Ketten / Na₃Cu₄S₄-a Thiocuprate with Isolated ¹ _∞[Cu₄S₄]-Chains

Burschka

1979

Zeitschrift Für Naturforschung B

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“…As all the copper atoms occupy the same crystallographic position, it is impossible to distinguish between copper atoms in the oxidation states + 1 and + 2 suggested by the formula A Cu/ 1 Cu + 2S 3 . Specific conductivity measurements (40 Q-l'cm-1 for KCU4S3 and 60 Q-l'cm-1 for RbCu 4 S 3 ) show a metallic behaviour which is contrary to the formulation of different oxidation states of the copper atoms [56].…”

Section: The Copper Groupmentioning

confidence: 99%

The Layered Structures of Ternary Chalcogenides with Alkali and Transition Metals

Bronger

1976

Crystallography and Crystal Chemistry of Materials With Layered Structures

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Layered Structures of Binary Metal Chalcogenides as a Basis for the Construction of Ternary CompoundsThe structure of binary fluorides and oxides with alkali and alkaline-earth metals can be largely understood by means of the supposition of electrostatic binding forces. Thus the sequence of structure types with changing co-ordination numbers for cations and anions depending on their radial quotients, can be nearly quantitatively predicted by a simple model using electrostatically attracting and repelling forces. Moreover, the lattice energies calculated by means of the electrostatic model agree satisfactorily with those which can be experimentally determined by means of the Born-Haber cycle. The dominant role of the electrostatic binding forces decreases considerably if one changes over to the fluorides and oxides of the remaining main group and transition metals, especially when the electropositive atoms are in higher oxidation states. The binary chlorides and sulphides, bromides and selenides, as well as the iodides and tellurides of the alkali and alkaline-earth metals exhibit progressively increasing covalent binding character, especially as the atomic weight of the anionic partner increases. Analogous compounds with the other main group metals continue this tendency and the corresponding phases with the transition metals can already assume metallic properties. Above all, the systems with sulphur, selenium and tellurium, which will be discussed here in greater detail, can often be recognized as intermetallic systems. Here the existence of many phases, mostly having wide ranges of homogeneity, can be observed.The transition from the more salt-like structured chalcogenides to those already having metallic properties can be seen clearly from the example of the largely stoichiometrically composed mono-and dichalcogenides -MX and MX 2 -of the metals of the 4th period (see Tables I and II). Included in the tables are the hitherto known high pressure and high temperature phases [1].In the range of the MX compounds with the NaCl structure type, in which the cations occupy all the octahedral sites in a cubic close-packed structure of anions, mainly ionic bonds are found. Exceptions are the scandium chalcogenides, in which for scandium, the oxidation state + 3 must be assumed, the electrons not required for the inert gas configuration of the X 2 -giving rise to metallic properties. In the MX com-

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Alkalithio‐ und ‐selenoverbindungen der Übergangselemente. III. Strukturuntersuchungen an Alkalithiocupraten

Cited by 82 publications

References 3 publications

Crystal chemistry and structural design of iron-based superconductors

Crystal chemistry and structural design of iron-based superconductors

Na₃Cu₄S₄-ein Thiocuprat mit unverknüpften ¹ _∞[Cu₄S₄] -Ketten / Na₃Cu₄S₄-a Thiocuprate with Isolated ¹ _∞[Cu₄S₄]-Chains

The Layered Structures of Ternary Chalcogenides with Alkali and Transition Metals

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Alkalithio‐ und ‐selenoverbindungen der Übergangselemente. III. Strukturuntersuchungen an Alkalithiocupraten

Cited by 82 publications

References 3 publications

Crystal chemistry and structural design of iron-based superconductors

Crystal chemistry and structural design of iron-based superconductors

Na3Cu4S4-ein Thiocuprat mit unverknüpften 1 ∞[Cu4S4] -Ketten / Na3Cu4S4-a Thiocuprate with Isolated 1 ∞[Cu4S4]-Chains

The Layered Structures of Ternary Chalcogenides with Alkali and Transition Metals

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Na₃Cu₄S₄-ein Thiocuprat mit unverknüpften ¹ _∞[Cu₄S₄] -Ketten / Na₃Cu₄S₄-a Thiocuprate with Isolated ¹ _∞[Cu₄S₄]-Chains