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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Topics in catalysis 14 (2000), S. 95-100 
    ISSN: 1572-9028
    Keywords: ruthenium ; ruthenium dioxide ; oxide ; CO oxidation ; oxygen ; chemisorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract CO oxidation over ruthenium dioxide (RuO2) dominates the CO/CO2 conversion rate over the catalytically active oxygen-rich Ru(0001) surfaces. In sharp contrast, chemisorbed O overlayers on Ru(0001) (with and without dissolved oxygen) are virtually inactive with respect to CO oxidation.
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  • 2
    ISSN: 1573-7357
    Keywords: 74.25 Jb ; 74.72 Jt ; 79.60 Bm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report polarization-dependent angle-resolved photoemission studies of single crystalline Ba2Cu3O4Cl2. This antiferromagnet adopts a layered body-centered tetragonal structure related to that of the cuprates, but with anextra copper site resulting in a plane with Cu3O4 stoichiometry. For the Γ-M direction of the Brillouin zone we observe a dispersive feature with a bandwidth of 400 ±80 meV, which approaches to within ∼ 0.9 eV of the Fermi level at (π/2,π/2). The magnitude of the observed dispersion and its polarization dependence are consistent with its origin as a purely antibonding combination of O2px,y and $$Cu3d_{x^2 - y^2 }$$ atomic orbitals from the cuprate-like CuO2 sub-system, i.e. Zhang-Rice singlets.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 435 (1977), S. 33-44 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermodynamics of the Vaporization of Copper(I) HalidesThe equilibria of the vaporization of copper(I) halides were measured by means of a static method. The predominant species in the vapour are the trimeric ones. The enthalpies and entropies of vaporization (kcal/mol and e. u./mol) at 1 100 K were determined to be 42.7 and 23.8 für CuCl, 43.1 and 10.7 for Cu2Cl2, 18.4 and 10.0 für Cu3Cl3, 15.5 and 5.9 for Cu4Cl4, 10.6 and 11.3 for Cu3Br3, 24.0 and 7.8 for Cu4Br4, 25.1 and 14.8 for Cu3I3, respectively. Taking into account the results of chemical transport experiments concerning the transport of copper by means of iodine, the standard entropy at 298 K of Cu3I3(gas) was found to be 130 e. u./mol and the fusion enthalpy at 298 K was determined to be 20 kcal/mol.
    Notes: Die Verdampfungsgleichgewichte der Kupfer(I)-halogenide wurden mit einer statischen Methode gemessen. Der Dampf besteht überwiegend aus Trimeren. Folgende Verdampfungsenthalpien und -entropien bei 1 100 K wurden bestimmt (in kcal/Mol bzw. Clausius): CuCl: 42,7; 23,8; Cu2Cl2: 43,1; 19,7; Cu3Cl3: 18,4; 10,0; Cu4Cl4: 15,5; 5,9; Cu3Br3: 19,6; 11,3; Cu4Br4: 24,0; 7,8; Cu3J3: 25,1; 14,8.Unter Hinzuziehung der Beobachtungen beim chemischen Transport von Cu mit Jod wurde die Standardentropie bei 298 K für Cu3J3,g erhalten zu 130 cl und die Bildungsenthalpie zu 20 kcal/Mol.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 444 (1978), S. 125-134 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations of the Equilibria in the Cobalt(II) Iodide VapourTotal pressure measurements over cobalt(II) iodide and in the unsaturated vapour lead to equations for the decomposition pressure (I + I2) and for the saturation pressure of CoI2 and Co2I4, respectively, as well as for the constant of the equilibrium \documentclass{article}\pagestyle{empty}\begin{document}$$ 2{\rm CoJ}_{2,{\rm g}} = {\rm Co}_2 {\rm J}_{4,{\rm g}} $$\end{document} Standard enthalpies of formation are obtained: ΔH°f(CoI2,l, 298) = -12.5 ± 3 kcal/mole, ΔH°f(CoI2,g,298) = 28.3 ± 3 kcal/mole, and ΔH°f(Co2I4,g,298) = 15.6 ± 3 kcal/mole. The standard entropy of liquid CoI2 is found to be S°(CoI2,l,298) = 44.5 ± 2 e. u. per mole.
    Notes: Aus Messungen des Gesamtdruckes über flüssigem Kobalt(II)-jodid und im ungesättigten Dampf wird der Zersetzungsdruck (J2 + J), der Sättigungsdruck an CoJ2 und Co2J4 sowie die Lage des Gleichgewichtes \documentclass{article}\pagestyle{empty}\begin{document}$$ 2{\rm CoJ}_{2,{\rm g}} = {\rm Co}_2 {\rm J}_{4,{\rm g}} $$\end{document} ermittelt. Man erhält daraus die Standardbildungsenthalpien ΔH°B(CoJ2,fl, 298) = -12,5 ± 3 kcal/mol, ΔH°B(CoJ2,g, 298) = 28,3 ± 3kcal/mol und ΔH°B(Co2J4,g, 298) = 15,6 ± 3 kcal/mol. Als Standardentropie für flüssiges CoJ2 wird S°(CoJ2,fl,298) = 44,5 ± 2 cl gefunden.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 481 (1981), S. 13-21 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of the Superconducting Ternary Phase PbMo6S8 by Chemical Transport ReactionsThe only ternary phase existing in the system Pb—Mo—S is the superconducting compound PbxMo6Sy (PMS). It can be transported by CTR using PbBr2 if an equilibrium mixture of PMS and Mo is present at the starting side, or if there is the pure PMS phase not exceeding a critical sulphur content. The transport conditions were deduced from a thermodynamical analysis of the system Pb—Mo—S—Br. Now it can be stated that all condensed phases occuring in the Pb—Mo—S system can be deposited from vapour phase by CTR or by sublimation: Pb, Mo, S, PbS, Mo2S3, MoS2, PMS.
    Notes: Im System Pb—Mo—S tritt nur eine ternäre Phase auf: PbxMo6Sy(PMS). Sie kann mit PbBr2 chemisch transportiert werden, wenn der Ausgangsbodenkörper PMS mit Mo im Gleichgewicht enthält oder ein kritischer Schwefelgehalt in PMS nicht überschritten wird. Die Bedingungen für den Transport folgen aus einer thermodynamischen Analyse des Transportsystems. Somit können alle kondensierten Phasen im System durch chemischen Transport oder Sublimation aus der Gasphase abgeschieden werden (Pb, Mo, S, PbS, Mo2S3, MoS2, PMS).
    Additional Material: 5 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical Transport Reactions of Ni-Sulfides and Some Relationships in C.T.R. of Complex Solids in the Case of Sulfides of Fe, Co, NiCrystals of α-Ni3S2, NiS, and NiS2 as well as solid solutions Fe1-yNiySx were grown by C.T.R. The coexistence equilibrium pressure of the solution equilibrium pressure p(S2), the activity of the metal component, the stability of gaseous metal halides concerning decomposition as well as their stability related on the transport agent have to be taken into account to choose a suitable transport agent, which have a sometimes opposite influence on the transport behaviour. Halogenes, hydrogen halides, and GeI2 were used as transport medium.
    Notes: Durch chemische Transportreaktionen wurden Kristalle der Phasen α-Ni3S2, NiS und NiS2 sowie Mischkristalle Fe1-yNiySx erhalten. Bei der Auswahl des Transportmittels sind der Koexistenzzersetzungsdruck bzw. Löslichkeitsdruck p(S2) und die Metallaktivität im Bodenkörper, die Stabilität der gasförmigen Metallhalogenide bezüglich Zerfall und ihre Stabilität relativ zum Transportmittel zu beachten, die z. T. gegenläufigen Einfluß haben. Geeignete Transportmittel sind Halogene, Halogenwasserstoffe und GeI2.
    Additional Material: 7 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 421 (1976), S. 111-121 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical Transport of Iron Sulphide. II. Experimental Results on the Transport of FeSx with IodineIt is possible to deposite monocrystals of iron sulphide FeSx by means of CTR method using iodine as transport agent. The presence of sufficient, high sulfur partial pressures is the most important condition for the FeSx being transported, in other words: x must be equal or greater than approximately 1.04. The transport velocity and the shape of the deposited crystals depend on temperature, amount of iodine, and composition of the original material. The expected differences between the composition of the deposited solid and that of the residue can be verified experimentally.
    Notes: Eisensulfid FeSx läßt sich durch chemischen Transport mit Jod in einkristalliner Form abscheiden. Voraussetzung für die Transportierbarkeit ist ein genügend hoher Schwefelpartialdruck, gleichbedeutend mit x ≳ 1,04. Die Transportgeschwindigkeit und die Form der abgeschiedenen Kristalle hängen von Temperatur, Transportmittelmenge und von der Bodenkörperzusammensetzung ab. Die erwarteten Unterschiede in der Zusammensetzung des abgeschiedenen Bodenkörpers und des Transportrückstandes werden experimentell bestätigt.
    Additional Material: 4 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 436 (1977), S. 253-264 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemical Transport in the System Fe—O by Consideration of the Oxygene Coexistence PressureThe influence of the transport agents Cl2, TeCl4, and HCl on the chemical transport behaviour of the oxidic phases of iron is analysed thermodynamically. It is necessary to observe the oxygene coexistence pressure of the phases. The mentioned transport agents may be used to transport the iron oxides as followed: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm Cl}_{\rm 2} } \hfill & { -\; {\rm Fe}_{\rm 2} {\rm O}_{{\rm 3,0}} } \hfill \\ {{\rm TeCl}_{\rm 2} } \hfill & { -\; {\rm Fe}_{\rm 2} {\rm O}_{{\rm 3,o}};{\rm Fe}_{\rm 2} {\rm O}_{{\rm 3,u}};{\rm Fe}_{\rm 3} {\rm O}_{{\rm 4,o}} - {\rm and\; near\; the\; upper\; phase\; bounbary;}} \hfill \\ {{\rm HCl}} \hfill & { -\; {\rm all\; Oxides}{\rm .}} \hfill \\\end{array} $$\end{document} The conclusions are verified by experiments.
    Notes: Die Wirkung der Transportmittel Cl2, TeCl4 und HCl beim chemischen Transport der Oxidphasen des Eisens unter Berücksichtigung des Sauerstoffkoexistenzdruckes wird thermodynamisch analysiert. Die genannten Transportmittel können zum Transport für folgende Phasen benutzt werdenIndex o bedeutet obere, u untere Phasengrenze (index o  -  upper phase boundary, u  -  lower phase boundary): \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c}{{\rm Cl}_{\rm 2} } \hfill & {{\rm f\ddot ur\; Fe}_{\rm 2} {\rm O}_{{\rm 3,0}} } \hfill \\{{\rm TeCl}_{\rm 2} } \hfill & {{\rm f\ddot ur\; Fe}_{\rm 2} {\rm O}_{{\rm 3,o}};{\rm Fe}_{\rm 2} {\rm O}_{{\rm 3}{\rm .u}};{\rm Fe}_{\rm 3} {\rm O}_{{\rm 4,o}} - {\rm und\; nahe\; der\; oberen\; Phasengrenze;}} \hfill \\{{\rm HCl}} \hfill & {{\rm f\ddot u\; alle\; Oxide}{\rm .}} \hfill \\\end{array} $$\end{document} Die theoretischen Schlußfolgerungen werden durch Experimente belegt.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 442 (1978), S. 79-85 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Chemical Transport of the CoS phaseThe CoSx Phase can be deposited as single crystals by CTR using iodine, only if x is greater than 1.06. This is due to the sulphur phase equilibrium pressure which otherwise is too small for effecting this transport. HI or GeI2 can be used as transport agent for specimens with less sulphur contents. Using GeI2 CTR also yields monocrystals of the Co9S8 phase.
    Notes: Die Phase CoSx läßt sich durch chemischen Transport mit Jod einkristallin abscheiden, wenn x 〉 1,60 ist. Für schwefelärmere Proben sind HJ oder GeJ2 als Transportmittel geeignet. Das Transportverhalten ist eine unmittelbare Folge des S2-Phasengleichgewichtsdruckes über diesen Bodenkörpern. Durch Transport mit GeJ2 kann auch Co9S8 einkristallin erhalten werden.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 450 (1979), S. 21-26 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On a Possibility of Calculation of the Chemical Transport Behaviour of Ternary and More Complicated SolidsRelations are deduced in order to describe the transport behaviour of phases with a homogeniety range or of several solid phases in equilibrium in ternary and more complicated systems. In analogy to binary systems the transport behaviour can be predicted on the base of a thermodynamic analysis of the heterogeneous equilibria.
    Notes: Zur Beschreibung des Transportverhaltens von Phasen mit Homogenitätsgebiet oder von mehreren im Gleichgewicht stehenden Phasen in ternären und komplizierteren Systemen können ähnliche Beziehungen gewonnen werden, wie bei binären Systemen. Das Problem kann, wie schon bei binären Systemen, auf eine thermodynamische Analyse der heterogenen Gleichgewichte zurückgeführt werden.
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