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- W4250869499 abstract "Stahlgrau glänzende Einkristalle von ACu4As2 mit A = Ca–Ba und Eu wurden durch Umsetzungen entsprechender Elementgemenge bei ca. 900 °C synthetisiert. Strukturbestimmungen mit Hilfe von Einkristall-Röntgendiffraktometerdaten ergaben, daß die Verbindungen isotyp sind und in dem rhomboedrischen CaCu4P2-Strukturtyp (R3m; Z = 3) mit folgenden Gitterkonstanten kristallisieren (hexagonale Aufstellung):CaCu4As2 a = 4,163(1) Å c = 22,554(1) ÅSrCu4As2 a = 4,203(1) Å c = 23,452(2) ÅEuCu4As2 a = 4,183(1) Å c = 23,154(2) ÅBaCu4As2 a = 4,234(2) Å c = 24,475(2) Å.Nach Suszeptibilitätsmessungen ist Europium in EuCu4As2 zweiwertig und ordnet bei ca. 35 K ferromagnetisch. Synthesis and Crystal Structure of ACu4As2 (A: Ca–Ba, Eu) Steel-gray single crystals of ACu4As2 with A = Ca–Ba and Eu respectively were synthesized by heating mixtures of the elements at about 900 °C. Structure determinations with X-ray diffractometry data revealed, that the isotypic compounds crystallize in the rhombohedral CaCu4P2 type structure (R3m; Z = 3) (hexagonal axes see ”︁Inhaltsübersicht”︁”︁). Measurements of the susceptibility of EuCu4As2 showed divalent Eu and ferromagnetic order at 35 K." @default.
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- W4250869499 date "1999-04-01" @default.
- W4250869499 modified "2023-09-26" @default.
- W4250869499 title "Synthese und Kristallstruktur von ACu4As2 (A: Ca–Ba, Eu)" @default.
- W4250869499 doi "https://doi.org/10.1002/(sici)1521-3749(199904)625:4<625::aid-zaac625>3.3.co;2-q" @default.
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