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  • 1
    ISSN: 0044-2313
    Keywords: Ternary Intermetallic Compounds ; Platinium ; Palladium ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structures of the Compounds CaPtGa, CaPtIn and CaPd0.4Ga1.6The new compounds CaPtGa, CaPtIn and CaPd0.4Ga1.6 were prepared by heating appropriate mixtures of the elements under an Ar-atmosphere. The results of the structural analysis of single crystals by means of X-ray diffraction are given in the section „Inhaltsübersicht“. CaPtGa and CaPtIn are isotypic and form the TiNiSi type structure (Pnma), where the Pt-atoms have a distorted tetrahedral environment consisting of Ga- resp. In-atoms. CaPd0.4Ga1.6 crystallizes in the CeCu2-type structure (Imma), the Cu positions being statistically occupied by Pd- and Ga-atoms.
    Notes: Strukturuntersuchungen an den durch Erhitzen von Elementgemengen unter Argon hergestellten intermetallischen Verbindungen CaPtGa und CaPtIn zeigen, daß diese dem TiNiSi-Typ mit verzerrter Tetraederkoordination um die Pt-Atome entsprechen. Es liegt Raumgruppe Pnma (Nr. 62) mit den Gitterkonstanten für CaPtGa a = 7,184(1) Å, b = 4,429(1) Å, c = 7,595(1) Å und Z = 4 sowie für CaPtIn mit a = 7,280(1) Å, b = 4,372(1) Å, c = 8,356(1) Å und Z = 4 vor. Die Verbindung CaPd0,4Ga1,6 kristallisiert im CeCu2-Typ, bei der die Cu-Punktlagen statistisch von Ga- und Pd-Atomen besetzt sind. Die Strukturrechnung erfolgte in Imma (Nr. 72) mit a = 4,462(1) Å, b = 7,231(1) Å, c = 7,745(1) Å und Z = 4.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Ternary Intermetallic Compounds ; Platinium Metals ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structures of the Compounds Ca3Pd2Ga2, Ca3Pt2Ga2, Ca3Rh2Ga3, and Ca3Ir2Ga3The new compounds Ca3Pd2Ga2, Ca3Pt2Ga2, Ca3Rh2Ga3, and Ca3Ir2Ga3 were prepared by heating appropriate mixtures of the elements under an Argon-atmosphere. The results of the structure analysis of single crystals by means of X-ray diffraction are given in the section “Inhaltsübersicht”. Ca3Pd2Ga2 and Ca3Pt2Ga2 are isotypic and form the Y3Rh2Si2 type structure (Pbcm), where the platinium metals have a trigonal environment consisting of Ga-atoms. The isotypic compounds Ca3Rh2Ga3 and Ca3Ir2Ga3 (Pbcm) form a new type of structure, which is related to the Y3Rh2Si2 type with a distorted tetrahedral surrounding of Ga-atoms for Rh (resp. Ir).
    Notes: Ca3Pd2Ga2 (Pbcm; a = 5,823(1) Å, b = 7,898(1) Å, c = 13,865(1) Å; Z = 4) und Ca3Pt2Ga2 (Pbcm; a = 5,792(1) Å, b = 7,884(1) Å, c = 13,728(1) Å; Z = 4) sind isotyp und bilden die Y3Rh2Si2-Struktur (Pbcm; Z = 4), wobei die Ga-Atome die Pd- bzw. Pt-Atome trigonal koordinieren. Ca3Rh2Ga3 (Pnma; a = 8,063(1) Å, b = 14,851(2) Å, c = 5,826(1) Å; Z = 4) und Ca3Ir2Ga3 (Pnma; a = 8,136(2) Å, b = 14,796(3) Å, c = 5,806(3) Å; Z = 4) kristallisieren in einer der Y3Rh2Si2 verwandten neuen Struktur, in der die Platinmetallatome (Ir bzw. Rh) verzerrt tetraedrisch von Ga-Atomen umgeben sind. Die Verbindungen konnten durch Erhitzen der Elementgemenge unter Argon hergestellt werden. Die röntgenographischen Strukturuntersuchungen wurden an Einkristallen durchgeführt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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