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  • 1
    Electronic Resource
    Electronic Resource
    Ternary carbides Ln2Mn17C3-x (Ln = La, Ce, Pr, Nd, Sm) with filled Th2Zn17 type structure (1986)
    s.l. : American Chemical Society
    Inorganic chemistry 25 (1986), S. 279-282 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00223a010
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The crystal structure of U5Re3C8 (1988)
    Springer
    Monatshefte für Chemie 119 (1988), S. 319-326 
    Details
    ISSN: 1434-4475
    Keywords: Crystal structure ; Interstitial carbides ; U5Re3C8
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung U5Re3C5 kristallisiert tetragonal in der Raumgruppe P4/mbm mit den Gitterkonstantena=1 131.3(1) pm,c=330.29(7) pm,V=0.4227 nm3 undZ=2 Formeleinheiten pro Zelle. Die Struktur wurde aus Einkristall-Diffraktometerdaten bestimmt und zu einem Restwert vonR=0.032 für 649 Strukturfaktoren und 24 veränderliche Parameter verfeinert. In diesem neuen Strukturtyp haben die Kohlenstoffatome annähernd oktaedrische Umgebungen, die aus fünf Uran- und einem Rhenium- bzw. vier Uran- und zwei Rheniumatomen gebildet werden. Die Positionen der Metallatome entsprechen denen einer kubisch raumzentrierten Packung. Dies gilt auch für die Strukturen von Ho2Cr2C3, UCr4C4, UMoC2, YCoC und U2IrC2.
    Notes: Abstract U5Re3C8 crystallizes tetragonal in space group P4/mbm with the lattice constantsa=1 131.3(1) pm,c=330.29(7) pm,V=0.4227 nm3 andZ=2 formula units per cell. The structure was determined from single-crystal counter-data and refined to a residual ofR=0.032 for 649 structure factors and 24 variable parameters. It is of a new type with carbon atoms on three different sites with approximately octahedral environment of five uranium and one rhenium or four uranium and two rhenium atoms. The positions of the metal atoms correspond to those of a (slightly distorted) cubic body centered structure as is also found for Ho2Cr2C3, UCr4C4, UMoC2, YCoC, and U2IrC2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810257
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of VPS and PVD coatings for metallographic and TEM investigations (1992)
    Springer
    Microchimica acta 107 (1992), S. 279-282 
    Details
    ISSN: 1436-5073
    Keywords: plasma sprayed coatings ; physical vapour deposition ; quality control ; preparation techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The aim of the first part of the paper is to give some advice for the faultless metallographic preparation of vacuum plasma sprayed coatings. Several coating/substrate combinations using metals, alloys and ceramics were investigated to derive some general rules. The second part deals with a preparation technique for cross-sections- of physical vapour deposition coatings. This technique was optimized for TiN and Ti(C, N) coatings on hardmetals which were examined in an analytical transmission electron microscope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244482
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  • 4
    Electronic Resource
    Electronic Resource
    The carbides RE2MnC4 (RE = Y, Er, Tm) with Er2FeC4-type structureDedicated to Professor Rudolf Hoppe on this 70th Birthday (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 442-446 
    Details
    ISSN: 0044-2313
    Keywords: Crystal structure ; rare earth manganese carbides ; RE2MnC4 ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Carbide RE2MnC4 (RE = Y, Er, Tm) mit Er2FeC4-StrukturDie Titelverbindungen wurden durch Schmelzen kaltgepreßter Pillen der elementaren Komponenten im Lichtbogen dargestellt. Sie kristallisieren mit der rhombischen Er2FeC4-Struktur, die aus Röntgendaten eines Einkristalls von Er2MnC4 verfeinert wurde: Ibam, a = 760,4(1)pm, b = 937,1(1)pm, c = 504,0(1)pm, R = 0,021 für 524 Strukturfaktoren und 17 variable Parameter. Y2MnC4 wird bis zu 1,7 K nicht supraleitend. Die chemische Bindung in diesen Carbiden wird kurz diskutiert.
    Notes: The title compounds were prepared from coldpressed pellets of the elemental components by arcmelting. They crystallize with the orthorhombic Er2FeC4-type structure, which was refined from X-ray data of an Er2MnC4 single crystal: Ibam, a = 760.4(1)pm, b = 937.1(1)pm, c = 504.0(1)pm, R = 0.021 for 524 structure factors and 17 variable parameters. Y2MnC4 does not become superconducting down to 1.7 K. Chemical bonding in these compounds is briefly discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190303
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    Paper (German National Licenses)
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