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  • Articles: DFG German National Licenses  (5)
  • chalcogen  (2)
  • neutron diffraction  (2)
  • 25.70  (1)
  • 1
    Electronic Resource
    Electronic Resource
    One-body dynamics modified by collective fluctuations (1988)
    Springer
    The European physical journal 331 (1988), S. 43-51 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.Cn ; 24.60 ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show how the fluctuating part of the residual coupling between collective and intrinsic motion of a dissipative heavy-ion collision induces correlations in either subspace. They lead in general to a transport equation for the collective motion, and to a new term in the equation for the one-body density which describes collisions with the collective fluctuations. The resulting redistribution of the single-particle occupation numbers ρα and the evolution of the fluctuations are coupled with each other due to the dependence of the transition rates in the master equation on the fluctuations, and of the transport coefficients on ρα. Considering the special case of a long contact phase, we find the fluctuations to be most effective, with respect to a randomization of ρα, within a certain critical region where they pass from stable to unstable behaviour. Estimates are made for the corresponding relaxation times employing a schematic model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289429
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  • 2
    Electronic Resource
    Electronic Resource
    Neue Halogenozinkate(II) M2IZnX4 (MI = Li, Na; X = Cl, Br) mit OlivinstrukturProfessor Heinrich Nöth zum 65. Geburtstage gewidmet (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 993-998 
    Details
    ISSN: 0044-2313
    Keywords: Bromozincates ; zinc ; olivine-type halides ; neutron diffraction ; fast ionic conductivity ; Raman spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Halogenozincates M2IZnX4 (MI = Li, Na; X = Cl, Br) of Olivine TypeThe hitherto unknown tetrabromozincates Li2ZnBr4 and Na2ZnBr4 have been prepared. Quaternary halides Li2Zn(Cl, Br)4 and Li2Zn(Br, I)4 have been not obtained due to decomposition to mixtures of LiCl and ZnBr2, and LiBr and ZnI2. The crystal structures of the olivine-type bromides and of the high-temperature polymorph of Li2ZnCl4 have been determined by neutron powder diffraction using the Rietveld method (space group Pnma, Z = 4, a = 1 360.41(4), b = 788.47(2), c = 647.07(2) pm, RI = 9.07% (Li2ZnBr4), a = 1 446.32(5), b = 853.02(3), c = 676.61(2) pm, RI = 9.29% (Na2ZnBr4), a = 1 277.60(3), b = 741.76(2), c = 611.10(1) pm, RI = 7.63% (Li2ZnCl4)). The Raman spectra as well as the results of thermal analyses (DSC) and conductivity measurements (impedance spectroscopy) are presented and discussed. Contrary to Li2ZnCl4, Li2ZnBr4 and Na2ZnBr4 do not undergo any phase transition between 20°C and their melting points.
    Notes: Die Darstellung der bisher nicht bekannten Tetrabromozinkate Li2ZnBr4 und Na2ZnBr4 wird beschrieben. Quaternäre Halogenide des Typs Li2Zn(Cl, Br)4 bzw. Li2Zn(Br, I)4 konnten nicht erhalten werden. Es erfolgt Entmischung zu LiCl und ZnBr2 bzw. LiBr und ZnI2. Die Kristallstrukturen der im Olivintyp kristallisierenden Bromide und der Hochtemperaturform von Li2ZnCl4 wurden auf der Basis von Neutronenpulver-Messungen nach der Rietveld-Methode bestimmt (Raumgruppe Pnma, Z = 4, a = 1 360,41(4), b = 788,47(2), c = 647,07(2) pm, RI = 9,07% (Li2ZnBr4), a = 1 446,32(5), b = 853,02(3), c = 676,61(2) pm, RI = 9,29% (Na2ZnBr4), a = 1 277,60(3), b = 741,76(2), c = 611,10(1) pm, RI = 7,63% (Li2ZnCl4)). Raman-Spektren sowie das Ergebnis thermoanalytischer Untersuchungen (DSC) und Leitfähigkeitsmessungen (Impedanz-Spektroskopie) werden mitgeteilt. Li2ZnBr4 und Na2ZnBr4 zeigen im Gegensatz zu Li2ZnCl4 zwischen 20°C und dem Schmelzpunkt keine Phasenumwandlung.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190606
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  • 3
    Electronic Resource
    Electronic Resource
    CuClS0.94Te1.06 und CuBrS0.92Te1.08, zwei neue Kupfer(I)-chalkogenhalogenide mit neutralen ∞1[STe]-Schrauben (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 853-857 
    Details
    ISSN: 0044-2313
    Keywords: Copper(I) sulfur tellurium halides ; chalcogen ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: CuClS0.94Te1.06 and CuBrS0.92Te1.08, Two New Copper(I) Chalcogen Halides Containing Neutral ∞1[STe] ScrewsCuClS0.94Te1.06 and CuBrS0.92Te1.08 are two new, isotypic compounds of general composition CuXYY′ (X = halide, Y, Y′ = chalcogen) with a mixed chalcogen substructure. They crystallize in the monoclinic system, space group P21/n (No. 14), a = 7.878(2), b = 4.727(1), c = 10.759(2) Å, β = 103.97(2)°, V = 388.8(2) Å3 (CuClS0.94Te1.06) and a = 8.043(3), b = 4.746(2), c = 11.240(4) Å, β = 103.46(3)°, V = 417.3(3) Å3 (CuBrS0.92Te1.08), both with Z = 4. The crystal structures are dominated by ordered ∞1[STe±0]-screws. From a crystal chemical point of view the sulfur and tellurium atoms are significantly different. The melting points are 341 °C (CuClS0.94Te1.06) and 336 °C (CuBrS0.92Te1.08). The compounds CuXYY′ (X = Cl, Br, I; Y, Y′ = S, Se, Te) are compared and discussed.
    Notes: Mit CuClS0.94Te1.06 und CuBrS0.92Te1.08 wurden zwei neue, isotype Verbindungen der Zusammensetzung CuXYY′ (X = Halogenid, Y, Y′ = Chalkogen) mit gemischtem Chalkogenteilgitter erhalten. Sie kristallisieren monoklin, RG P21/n (Nr. 14) mit a = 7,878(2), b = 4,727(1) und c = 10,759(2) Å, β = 103,97(2)°, V = 388,8(2) Å3 (CuClS0.94Te1.06) bzw. a = 8,043(3), b = 4,746(2) und c = 11,240(4) Å, β = 103,46(3)°, V = 417,3(3) Å3 (CuBrS0.92Te1.08), jeweils mit Z = 4. Strukturbestimmendes Merkmal sind die geordneten ∞1[STe±0]-Schrauben. Kristallchemisch sind die Schwefel- und Telluratome deutlich unterschiedlich. Die Schmelzpunkte liegen bei 341 °C (CuClS0.94Te1.06) bzw. 336 °C (CuBrS0.92Te1.08). Die Strukturen von CuXYY′ (X = Cl, Br, I; Y, Y′ = S, Se, Te) werden verglichen und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220517
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  • 4
    Electronic Resource
    Electronic Resource
    CuSeTeCl, CuSeTeBr und CuSeTeI: Verbindungen mit geordneten ∞1[SeTe]-Schrauben (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 969-974 
    Details
    ISSN: 0044-2313
    Keywords: Copper(I) selenium tellurium halides ; chalcogen ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: CuSeTeCl, CuSeTeBr, and CuSeTeI: Compounds with ordered ∞1[SeTe] ScrewsThe hitherto unknown copper(I) chalcogen halides CuSeTeCl, CuSeTeBr and CuSeTeI have been prepared and their crystal structures were determined. The compounds of general composition CuSeTeX crystallize in the monoclinic system, space group P21/n (No. 14), Z = 4, a = 7.9796(9), b = 4.7645(8), c = 10.843(3) Å, β = 104.12(1)°, V = 399.8(1) Å3 (X = Cl), a = 8.155(3), b = 4.765(2), c = 11.286(4) Å, β = 104.21(3)°, V = 425.1(3) Å3 (X = Br) and a = 8.4370(9) b = 4.7652(5), c = 11.996(2) Å, β = 103.178(9)°, V = 469.6(1) Å3 (X = I). The crystal structures show infinite onedimensional screws YY′ of chalcogen atoms, with Y = Se and Y′ = Te alternately. The coordinations of Se and Te in these compounds are quite different.
    Notes: Die bisher unbekannten Kupfer(I)-chalkogenhalogenide CuSeTeCl, CuSeTeBr und CuSeTeI wurden erstmals erhalten und ihre Kristallstrukturen bestimmt. Sie kristallisieren monoklin, RG P21/n (Nr. 14), Z = 4, mit a = 7,9796(9), b = 4,7645(8) und c = 10,843(3) Å, β = 104,12(1)°, V = 399,8(1) Å3 (X = Cl), a = 8,155(3), b = 4,765(2) und c = 11,286(4) Å, β = 104,21(3)°, V = 425,1(3) Å3 (X = Br) sowie a = 8,4370(9), b = 4,7652(5) und c = 11,996(2) Å, β = 103,178(9)°, V = 469,6(1) Å3 (X = I). In den Kristallstrukturen liegen eindimensional unendliche Schrauben YY′ vor, mit alternierend Y = Se und Y′ = Te. Die Umgebungen von Se und Te sind deutlich verschieden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210612
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  • 5
    Electronic Resource
    Electronic Resource
    Mößbauer- und Neutronenbeugungs-Messungen an Li6FeCl8 (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 901-904 
    Details
    ISSN: 0044-2313
    Keywords: Iron chlorides, lithium ; Mößbauer spectra ; neutron diffraction ; Suzuki type ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mößbauer and Neutron Diffraction Studies on Li6FeCl8On Suzuki-Type Li6FeCl8 Mößbauer spectra and neutron powder diffraction data are presented. The Suzuki-type structure (space group Fm3m, Z = 4, 1 031.11(1) pm) was supported refining by the Rietveld method (program PROFIL) to a final R1 = 6.8%. The Mößbauer spectra confirm the ideal octahedral coordination of the Fe2+ ions (no quadrupole splitting). The isomer shift of 1.097(1) mm s-1 at 295 K resembles those of other ferrous chlorides. At temperatures above the phase transition to deficient NaCl-type solid solution the half-width of the Mößbauer signal strongly increases.
    Notes: Die Mößbauer-Spektren und Neutronenpulver-Strukturdaten der Suzukiphase Li6FeCl8 werden mitgeteilt. Die Struktur (Raumgruppe Fm3m, Z = 4, a = 1 031,11(1) pm) konnte mit Hilfe des Rietveld-Verfahrens (Programm PROFIL) bis zu einem R-Wert R1 = 6,8% verfeinert werden. Die Mößbauer-Spektren ergeben eine exakt oktaedrische Umgebung von Fe2+ (keine Quadrupol-Aufspaltung). Die Isomerieverschiebung (1,097(1) mm s-1 bei 295 K) entspricht der anderer Eisen(II)chloride. Bei Temperaturen oberhalb der Phasenumwandlung zum defizienten NaCl-Typ-Mischkristall nimmt die Halbwertsbreite des Mößbauer-Signals zu.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190517
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