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  • 1
    Electronic Resource
    Electronic Resource
    Scandium carbide, Sc3C4, a carbide with C3 units derived from propadiene (1991)
    s.l. : American Chemical Society
    Inorganic chemistry 30 (1991), S. 427-431 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00003a013
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, crystal structure, electronic structure, and properties of Hf2In5, a metallic hafnide with one-dimensional Hf-Hf and two-dimensional in-in bonding (1996)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 2 (1996), S. 800-804 
    Details
    ISSN: 0947-6539
    Keywords: crystal structure ; electronic structure ; hafnium compounds ; indium compounds ; metallic conductivity ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hf2In5 - previously reported with the tentative composition “Hf3In4” - was prepared from the elements in a tantalum tube at 970 K. The X-ray diffractional characterization by means of single-crystal refinement reveals the presence of a tetragonal structure (a = 1024.71 (9), c = 305.66 (3) pm, P4/mbm, Z = 2) of Mn2Hg5 type. Hf2In5 is Pauli-paramagnetic and a good metallic conductor. Quasi-relativistic semiempirical and scalar-relativistic ab initio band structure calculations reveal Hf2In5 to be a hafnide, composed of a two-dimensional indium network threaded by infinite hafnium chains. The amount of In-In bonding scales counterintuitively with the interatomic distances.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.1460020709
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  • 3
    Electronic Resource
    Electronic Resource
    A Quintupled Superstructure of the KHg2 Type Realized for the New Stannide EuAuSn (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1852-1859 
    Details
    ISSN: 0947-6539
    Keywords: conductivity ; europium ; gold ; magnetic properties ; superstructures ; tin ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The title compound was prepared from the elements by reaction in a sealed tantalum tube at 1320 K followed by slow cooling to 970 K. EuAuSn crystallizes with a pronounced subcell of space group Imma (KHg2 type). Additional very weak reflections required a quintupled b axis. The superstructure was refined from single-crystal four-circle diffractometer data (Imm 2, a = 479.1(1) pm, b = 3833.6(5) pm, c = 820.1(1) pm, Z = 20, wR2 = 0.0834, 3675 F2 values and 94 variables). Six crystallographically different europium sites occur in the superstructure. Each europium site has an ordered near-neighbour environment of six gold and six tin atoms in the form of two tilted hexagons. Magnetic susceptibility measurements show Curie-Weiss behaviour above 50 K with an experimental magnetic moment of 7.6(1) μB/Eu, indicating divalent europium. EuAuSn orders antiferromagnetically at about 12 K and undergoes a metamagnetic transition at a critical field of 2.0(2) T. Electrical conductivity measurements show metallic behaviour with a room temperature value of 260 μΩcm. 151Eu and 119Sn Mössbauer spectroscopic experiments are compatible with divalent europium and show complex magnetic hyperfine field splitting at low temperature.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970031118
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  • 4
    Electronic Resource
    Electronic Resource
    151Eu Mössbauer spectroscopic, electric, and magnetic measurements of EuAgGe and EuAuGe (1997)
    Springer
    Hyperfine interactions 108 (1997), S. 389-400 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The physical properties of EuAgGe and EuAuGe, the structures of which are derived from the CeCu2 type, have been investigated in detail by means of magnetic susceptibility, electrical conductivity and 151Eu Mössbauer measurements. Above 50 K both germanides show Curie--Weiss behavior with experimental magnetic moments of \mu exp=7.70(5) \mu B (EuAgGe) and \mu exp=7.40(5) \mu B (EuAuGe) and Weiss constants of -2(1) K (EuAgGe) and 33(1) K (EuAuGe). For EuAgGe, a magnetic phase transition is observed below 18(1) K. Zero-field cooling and field cooling measurements indicate cluster glass behavior (weak ferromagnetism, mictomagnetism). Magnetization measurements at 5 K show a saturation magnetic moment of 3.3(2) \mu B/Eu at 5.5 T. 151Eu Mössbauer measurements show a Eu(II) valence state (\delta =-10.4 mm/s). While magnetic hyperfine splitting appears in the spectra at temperatures as high as 15 K, complete magnetic ordering is not reached at temperatures down to 4.2 K. EuAuGe orders ferromagnetically at 32.9(2) K. Magnetization measurements at 2 K show a saturation magnetic moment of 6.2(1) \mu B/Eu at 5.5 T, respectively, indicating that all spins are ordered ferromagnetically at low temperatures. 151Eu Mössbauer measurements show a Eu(II) valence state (\delta =-10.6 mm/s) and two spectral components in an approximate 1:1 ratio, subjected to magnetic hyperfine splitting effects at T1=32(2) and T2=18(4) K, respectively. Thus, the transition temperature of 32.9 K observed in the susceptibility measurements appears to be associated with ordering of only one of the two crystallographically distinct europium sites in this compound. Electrical conductivity measurements indicate metallic behavior for both germanides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012643720079
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  • 5
    Electronic Resource
    Electronic Resource
    EuPdIn2, YbPdIn2, and YbAuIn2: Syntheses, Structures, and Properties of New Intermetallic Compounds with Ordered Re3B-Type Structure (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 975-979 
    Details
    ISSN: 1434-1948
    Keywords: Europium ; Ytterbium ; Indium ; Intermetallic compounds ; Ferromagnetism ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The new compounds EuPdIn2 (1), YbPdIn2 (2), and YbAuIn2 (3) have been synthesized by high-frequency melting of the elements in sealed tantalum tubes and subsequent annealing at about 900 K. Their crystal structures have been determined by single-crystal X-ray diffraction techniques. Compounds 1, 2, and 3 crystallize with the MgCuAl2-type structure (space group Cmcm), a ternary ordered version of the Re3B type. Structural elements in these compounds are transition metal centered trigonal prisms made up of the rare earth and indium atoms. The transition metal (T) and indium atoms form a three-dimensionally infinite [TIn2] polyanionic network in which the large rare earth metal atoms occupy one-dimensional pentagonal tubes. A semiempirical band structure calculation on 1 reveals a non-vanishing density-of-states (DOS) at the Fermi level. The strongest bonding interactions are found for the In-In and Pd-In contacts; the Eu-Pd and Eu-In interactions are much weaker. Magnetic investigations indicate divalent character of the ytterbium atoms in 2, showing negative susceptibilities below room temperature. Compound 1 exhibits Curie-Weiss behavior above 50 K with an experimental magnetic moment of 7.8(1) μB, thus indicating divalent europium. Ferromagnetic ordering was observed at TC = 14.5(5) K, with a saturation moment of 6.8(1) μB/Eu at 5.5 T and 4 K, as determined from magnetization measurements. Compounds 1 and 2 are found to be metallic conductors.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    The Crystal Structures of Eu5Ge3 and EuIrGe2Dedicated to Professor Wolfgang Jeitschko on his 60th Birthday (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 779-784 
    Details
    ISSN: 0044-2313
    Keywords: Europium Germanide ; Europium Iridium Germanide ; Intermetallic Compounds ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Kristallstrukturen von Eu5Ge3 und EuIrGe2Eu5Ge3 and EuIrGe2 wurden aus den Elementen in Tantalampullen hergestellt und ihre Kristallstrukturen aus Röntgen-Einkristalldaten bestimmt. Eu5Ge3 kristallisiert in der Cr5B3-Struktur: I4/mcm, a = 799,0(1) pm, c = 1 536,7(1) pm, Z = 4, wR2 = 0,0421 für 669 F2-Werte und 16 Variable. In der Struktur von Eu5Ge3 liegen isolierte Germaniumatome und Ge2-Paare mit einem Ge—Ge-Abstand von 256,0 pm vor. Die Verbindung kann als Zintl-Phase mit der Formel [5 Eu2+]10+[Ge]4-[Ge2]6-beschrieben werden. Magnetische Messungen an Eu5Ge3 zeigen Curie-Weiss-Verhalten oberhalb 50 K mit einem magnetischen Moment von μexp = 7,6(1) μB, welches nahe am freien Ionenwert von μeff = 7,94 μB für Eu2+ liegt. EuIrGe2 ist isotyp mit CeNiSi2: Cmcm, a = 445,5(2) pm, b = 1 737,4(4) pm, c = 426,6(1) pm, Z = 4, wR2 = 0,0507 für 295 F2-Werte und 18 Variable. Die Struktur von EuIrGe2 ist aus alternierenden Schichtverbänden von EuIr2Ge2 und EuGe2 in AB-Folge aufgebaut, wobei diese Schichten gegenüber denen in ThCr2Si2 und AlB2 verzerrt sind. Der Ge—Ge-Abstand von 256,6 pm in der EuGe2-Schicht ist vergleichbar mit dem der Ge2-Hantel in Eu5Ge3.
    Notes: Eu5Ge3 and EuIrGe2 were prepared from the elements in tantalum tubes, and their crystal structures were determined from single crystal X-ray data. Eu5Ge3 adopts the structure of Cr5B3: I4/mcm, a = 799.0(1)pm, c = 1 536.7(1)pm, Z = 4, wR2 = 0.0421 for 669 F2 values and 16 variables. The structure of Eu5Ge3 contains isolated germanium atoms and germanium atom pairs with a Ge—Ge distance of 256.0 pm. Eu5Ge3 may be described as a Zintl phase with the formulation [5 Eu2+]10+[Ge]4-[Ge2]6-. Magnetic investigations of Eu5Ge3 show Curie-Weiss behaviour above 50 K with a magnetic moment of μexp = 7.6(1) μB which is close to the free ion value of μeff = 7.94 μB for Eu2+. EuIrGe2 is isotypic with CeNiSi2: Cmcm, a = 445.5(2) pm, b = 1 737.4(4) pm, c = 426.6(1) pm, Z = 4, wR2 = 0.0507 for 295 F2 values and 18 variables. The structure of EuIrGe2 is an intergrowth of ThCr2Si2-like slabs with composition EuIr2Ge2 and AlB2-like slabs with composition EuGe2 in an AB stacking sequence. Both slabs are distorted when compared to the symmetry of the prototypes. The Ge—Ge distance of 256.6 pm in the AlB2-like fragment is comparable to that in Eu5Ge3.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220505
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation, crystal structure, and magnetic properties of β-Li3TiF6 = Li2[4]Li7[6](TiF6)(TiF6)2 - a double fluoride?Professor Hans Georg von Schnering zum 65. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1329-1334 
    Details
    ISSN: 0044-2313
    Keywords: β-Li3TiF6 ; crystal structure ; band structure ; Jahn Teller effect ; magnetism ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung, Kristallstruktur und magnetische Eigenschaften von β-Li3TiF6 = Li2[4]Li7[6](TiF6)(TiF6)2 - ein Doppelfluorid?Purpurfarbene Einkristalle von β-Li3TiF6 wurden durch Erhitzen eines Gemenges von LiF und TiF3 (3 : 1) bei 820°C unter Argon erhalten. β-Li3TiF6 kristallisiert in C2/c mit a = 14.452(2) Å, b = 8.798(1) Å, c = 10.113(1) Å und β = 96.30(1)º. Die Struktur ist isotyp mit β-Li3VF6 und enthält isolierte gestauchte TiF6-Oktaeder (dTi-F = 1.91-2.01 Å). Die magnetischen Eigenschaften von β-Li3TiF6 untersucht und diskutiert. Die Bindungsverhältnisse werden anhand von Bandstruktur Rechnungen und Berechnungen des Madelunganteils der Gitterenergie, MAPLE, diskutiert.
    Notes: Purple colored single crystals of the β-modification of Li3TiF6 have been prepared by heating an appropriate mixture of LiF and TiF3 at 820°C under an argon atmosphere. β-Li3TiF6 crystallizes in C2/c with a = 14.452(2) Å, b = 8.798(1) Å, c = 10.113(1) Å and β = 96.30(1)º. The structure is isotypic to β-Li3VF6 and contains isolated compressed TiF6 octahedra (dTi-F = 1.91-2.01 Å). Magnetic properties of β-Li3TiF6 were studied and discussed. Band structure calculations and calculations of the Madelung part of the lattice energy, MAPLE, were performed to discuss the chemical bonding.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220810
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  • 8
    Electronic Resource
    Electronic Resource
    Structure, Chemical Bonding, and Properties of Sc2Ni2In (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 355-360 
    Details
    ISSN: 0044-2313
    Keywords: Scandium nickel indium ; Intermetallic Compounds ; Crystal Structure ; Pauli Paramagnetism ; Metallic Conductivity ; Band Structure Calculations ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Struktur, Chemische Bindung und Eigenschaften von Sc2Ni2InSc2Ni2In wurde durch Reaktion der elementaren Komponenten im Lichtbogenofen und anschließendes Tempern bei 1070 K hergestellt. Sc2Ni2In ist ein Pauli-Paramagnet und ein schlechter metallischer Leiter mit einem spezifischen Widerstand von 224 mΩcm bei Raumtemperatur. Die Kristallstruktur wurde aus Röntgen-Pulverdaten verfeinert: P4/mbm, a = 716.79(1) pm, c = 333.154(8) pm, Z = 2, Rwp = 0.040 und RB(I) = 0.026. Sc2Ni2In kristallisiert in einer ternären, geordneten Variante der U3Si2-Struktur. Die Nickel-und Indiumatome besetzen trigonale [NiSc6] Prismen bzw. quadratische [InSc8] Prismen. Diese Bauelemente leiten sich von der AlB2- und CsCl-Struktur ab. Semi-empirische Rechnungen zur Bandstruktur erweisen Sc2Ni2In als Nickelid, und die stärksten bindenden Wechselwirkungen werden für die Sc—Ni-Kontakte gefunden, gefolgt von Sc—In und Ni—In. Ein Modell fester Bänder legt die Existenz der isotypen Phase Sc2Ni2Sb nahe.
    Notes: Sc2Ni2In was prepared by a reaction of the elemental components in an are furnace and subsequent annealing at 1070 K. Sc2Ni2In is a Pauli paramagnet and a poor metallic conductor with a specific resistivity of 224 mΩcm at room temperature. Its crystal structure was refined from X-ray powder data: P4/mbm, a = 716.79(1) pm, c = 333.154(8) pm, Z = 2, Rwp = 0.040, and RB(I) = 0.026. Sc2Ni2In crystallizes with a ternary ordered version of the U3Si2-type structure. The nickel and indium atoms occupy [NiSc6] trigonal prisms and [InSc8] square prisms, respectively. These structural fragments are derived from the AlB2 and CsCl-type structures. Semi-empirical band structure calculations reveal Sc2Ni2In to be a nickelide, and the strongest bonding interactions are found for the Sc—Ni contacts, followed by Sc—In and Ni—In. A rigidband model suggests the existence of the isotypic phase Sc2Ni2Sb.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220225
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  • 9
    Electronic Resource
    Electronic Resource
    Ti9Se2 - Eine Verbindung mit kolumnaren ∞1[Ti9]-BaueinheitenProfessor Herbert Jacobs zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 630-634 
    Details
    ISSN: 0044-2313
    Keywords: Metal-rich titanium selenide ; preparation ; single crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Metal-Rich Titanium Selenide Ti9Se2The new compound Ti9Se2 has been prepared as hitherto most metal-rich phase in the system titanium-selenium. It crystallizes in the orthorhombic space group Pbam (No. 55) with a = 691.7(2), b = 1 550.5(9), c = 345.4(2) pm. The structure consists of ∞1[Ti9]-strings which are described within the concept of condensed clusters. The Se atoms are coordinated by tricapped trigonal prisms of Ti atoms.
    Notes: Die erstmals dargestellte Verbindung Ti9Se2 ist die bislang metallreichste Phase im binären System Titan-Selen. Sie kristallisiert in der orthorhombischen Raumgruppe Pbam (Nr. 55) mit a = 691.7(2), b = 1 550.5(9), c = 345.4(2) pm. Die Struktur enthält ∞1[Ti9]-Baueinheiten, die im Konzept kondensierter Metallcluster beschrieben werden. Die Se-Atome sind von einem dreifach überkappten trigonalen Prisma aus Ti-Atomen umgeben.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220410
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