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  • 1
    Electronic Resource
    Electronic Resource
    Morphology and Local Dynamics in a Series of Aromatic Terpolyesters (1994)
    s.l. : American Chemical Society
    Macromolecules 27 (1994), S. 3632-3641 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00091a027
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  • 2
    Electronic Resource
    Electronic Resource
    Phase diagram investigations for lowering the temperature of melt texturing of YBCO
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 235-240 (1994), S. 299-300 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(94)91373-0
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  • 3
    Electronic Resource
    Electronic Resource
    Representative sections in the T-x phase diagram of the system YBaCuO
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 185-189 (1991), S. 503-504 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4534(91)92054-F
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  • 4
    Electronic Resource
    Electronic Resource
    In-plane effective masses and quantum scattering times of electrons in narrow modulation-doped InGaAs/InP quantum wells (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2520-2522 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In-plane effective masses m*(parallel) and quantum scattering times are derived from temperature-dependent Shubnikov–de Haas oscillations measured on a series of modulation-doped InxGa1−xAs/InP quantum wells with x=0.53 and 0.75, and for well widths ranging from 3 to 7 nm. The values for m*(parallel) are consistently higher by 30%–70% than the respective bulk data. This result is in good agreement with recent theoretical calculations which predict an increase of m*(parallel) with decreasing well width. The scatter of the mass values for nominally identical quantum wells is assumed to reflect corresponding variations of the well widths. The ratio of quantum to classical scattering times and the carrier density dependence of the electron mobilities indicate that Coulomb scattering is important even in extremely narrow quantum wells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111560
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  • 5
    Electronic Resource
    Electronic Resource
    Oxygen solubility in the superconducting compound YBa2Cu3O x (6⩽x⩽7), studied by TG and barometric measurements (1988)
    Springer
    Journal of thermal analysis and calorimetry 33 (1988), S. 875-881 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die supraleitende Phase YBa2Cu3O x wurde mit Hilfe von Thermogrametrie und barometrischen Messungen im Bereich 300 bis 1200 K untersucht. Die sogar bei 250 °C beobachtete Reversibilität des Austausches von einem Teil des Sauerstoffs sowie die gefundenen Beziehungen zwischen Sauerstoffaktivität (Partialdruck), Sauerstoffgehalt und Temperatur können durch eine Lösung von Sauerstoff in YBa2Cu3O x erklärt werden. Aus den Ergebnissen kann gefolgert werden, daß Proben mit hohemx (≈7), die gute Supraleitungseigenschaften zeigen, bei hohen Temperaturen nőr unter hohem Sauerstoffdruck hergestellt werden können. Sie werden jedoch auch durch Tempern bei Normaldruck bei 250 bis 350 °C erhalten.
    Abstract: Резюме Проведены термограв иметрические и барометрические изм ерения сверхпроводн ика YBa2Cu3Ox в контролируемой атмосфере кислорода и в интервале температу р 300–1200 К. Полная обратимость о бмена определенной ч асти кислорода, найденная даже при 250°, и наблюдаемая взаимос вязь между парциальн ым давлением кислорода, его содерж анием и температурой, могут б ыть объяснены раство рением кислорода в YBa2Cu3Ox. Сдела но заключение, что образ цы с высоким значение м х (≈ 7), являющимся необходи мым для хороших сверхпроводящих сво йств, могут быть получ ены при высоких температура х только при ввсоких давлениях кислорода. Вместе с тем, такие обр азцы могут быть получены путем о тжига при нормальном давлении кислорода и при темпе ратурах между 250 и 350°.
    Notes: Abstract Thermogravimetry in controlled oxygen atmospheres and barometric measurements between 300 and 1200 K were performed on the YBa2Cu3O x superconducting phase. The complete reversibility of the exchange of a certain part of the oxygen, as found even at 250 °C, and the observed relationship between oxygen partial pressure, oxygen content and temperature, can be explained by the dissolution of oxygen in YBa2Cu3O x . It is concluded that samples with highx values (≈), as necessary for good superconducting properties, can be obtained at high temperatures only at high oxygen pressures, but they were obtained by annealing at normal pressure between 250 and 350 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138603
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  • 6
    Electronic Resource
    Electronic Resource
    Melt texturing and properties control of Nd1+yBa2-yCu3Ox bulk materials (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1445-1450 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Melt textured NdBaCuO samples with Tc = 94 K and jc(0 T, 77 K) = 46 kA/cm2 have been prepared on an isothermal route. The thermodynamic background of this procedure which aims at the production of a Ba rich Nd-123 is pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753903
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of the motion of spin probes and spin labels in amorphous polymers with two-dimensional field-step ELDOR (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 1093-1104 
    Details
    ISSN: 0887-6266
    Keywords: EPR ; spin label ; spin probe ; spin relaxation ; correlation time distributions ; electron double resonance ; amorphous polymers ; side group liquid crystalline polymer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The motion of nitroxide spin probes and spin labels in amorphous polymers is studied below the glass transition temperature with a two-dimensional pulsed electron double-resonance experiment. Polystyrene and a liquid crystalline side group polymer are studied using both spin probes and spin labels covalently bound to specific sites along the polymer chain. Two methyl acrylic polymers differing only in their side group structure and polyvinylacetate are compared and large differences in the molecular dynamics deduced from both the nuclear and the electron spin relaxation rates are observed as the glass transition is approached. The results demonstrate the complexity of small amplitude motion in simple polymers below the glass transition temperature and show that it is very sensitive to the packing in the polymer. © 1996 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Local dynamics in a thermotropic terpolyester as revealed by dynamic mechanical analysis, 2H NMR and dielectric spectroscopy (1996)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 47 (1996), S. 429-435 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dynamic mechanical, 2H NMR and dielectric spectroscopy techniques were used to identify the nature of the local motions involved in the secondary relaxations of a thermotropic aromatic terpolyester prepared from para-hydroxybenzoic acid, hydroquinone and isophthalic acid. Three secondary relaxations, denoted β, γ, and δ, were detected. A β relaxation, pointed out by dynamic mechanical measurements, is quite close to the large amplitude π-flip processes observed by 2H NMR. Correlated motions of the para-substituted rings and adjacent carbonyl groups may also participate in the β process. Then, at lower temperatures, a γ process is detected by both dielectric and dynamic mechanical experiments. It is assigned to small amplitude oscillations of the isophthalic acid units of the HBA33 polymer. At high temperatures, a heavy overlap of broad rate distributions for the β and γ processes observed in the measurements precludes a more detailed analysis. A dielectric relaxation, denoted δ relaxation, is observed at very low temperatures. It likely comes from motions of a very small number of water molecules trapped in the structure of the terpolyester.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1996.010471002
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  • 9
    Electronic Resource
    Electronic Resource
    Modellierung und Simulation reaktiver Absorptionsprozesse am Beispiel der Absorption nitroser Gase (1997)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 69 (1997), S. 1305-1306 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306909141
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  • 10
    Electronic Resource
    Electronic Resource
    Stability Fields in the System Mn—Mo—O and Thermochemical Data of Mn2Mo3O8 and MnMoO4 (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 551 (1987), S. 67-73 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Koexistenzgebiete im System Mn—Mo—O und thermochemische Daten von Mn2Mo3O8 und MnMoO4Mittels TG-Messungen wurde die Zersetzung von MnMoO4 und Mn2Mo3O8 in einer definierten Sauerstoffatmosphäre untersucht. Der aus den Ergebnissen erhaltene isotherme Schnitt des μ-x-Phasendiagramms des Systems Mn—Mo—O zeigt keine weitern ternären Phasen.Folgende thermochemische Daten wurden erhalten: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} \Delta _{\rm f} {\rm H}^ \circ {\rm (MnMoO}_{\rm 4} {\rm, 298) = } - 12{\rm 57 kJ/mol, S}^ \circ {\rm (MnMoO}_{\rm 4} {\rm, 298) = 134 J/(mol } \cdot {\rm K) } \\ \Delta _{\rm f} {\rm H}^ \circ {\rm (Mn}_{\rm 2} {\rm Mo}_{\rm 3} {\rm O}_{\rm 8} {\rm, 298) = } - 2{\rm 595 kJ/mol, S}^ \circ {\rm (Mn}_{\rm 2} {\rm Mo}_{\rm 3} {\rm O}_{\rm 8} {\rm, 298) = 279 J/(mol } \cdot {\rm K) }{\rm .} \\ \end{array} $$\end{document}
    Notes: The decomposition of MnMoO4 and Mn2Mo3O8 has been investigated by modified TG measurements in a controlled oxygen atmosphere. From the results the μ-x phase diagram of the system Mn—Mo—O in an isothermal representation has been obtained. The following thermochemical data have been evaluated: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} \Delta _{\rm f} {\rm H}^ \circ {\rm (MnMoO}_{\rm 4} {\rm, 298) = } - 12{\rm 57 kJ/mol, S}^ \circ {\rm (MnMoO}_{\rm 4} {\rm, 298) = 134 J/(mol } \cdot {\rm K) } \\ \Delta _{\rm f} {\rm H}^ \circ {\rm (Mn}_{\rm 2} {\rm Mo}_{\rm 3} {\rm O}_{\rm 8} {\rm, 298) = } - 2{\rm 595 kJ/mol, S}^ \circ {\rm (Mn}_{\rm 2} {\rm Mo}_{\rm 3} {\rm O}_{\rm 8} {\rm, 298) = 279 J/(mol } \cdot {\rm K) }{\rm .} \\ \end{array} $$\end{document}.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875510807
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