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  • 1
    Electronic Resource
    Electronic Resource
    THE SOLUBILITY OF CORUNDUM IN BASIC HYDROTHERMAL SOLVENTS (1963)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 67 (1963), S. 835-839 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100798a028
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  • 2
    Electronic Resource
    Electronic Resource
    Water interaction with the superconducting YBa2Cu3O7 phase (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 532-534 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that the superconducting YBa2Cu3O7 phase is highly sensitive to water and water vapor. This is probably due to the presence of nonequilibrium Cu3+ ions in this compound. In particular, the YBa2Cu3O7 phase decomposes in water to CuO, Ba(OH)2 and Y2BaCuO5 and evolves oxygen. Samples with a reduced oxygen content, e.g., YBa2Cu3O6.0, also decompose in an aqueous ambient. The superconductivity of YBa2Cu3O7 samples is greatly degraded by the interaction with water and humid air. This effect should not preclude practical application of these materials since it should be possible to protect them with coatings of metal, glass, or plastic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98389
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  • 3
    Electronic Resource
    Electronic Resource
    Stability of superconducting YBa2Cu3O7 in the presence of water (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1373-1375 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The new high transition temperature superconductors such as YBa2Cu3O7 in powdered form have been observed to react vigorously at room temperature with water producing a nonsuperconducting cuprate with copper in oxidation state +2, O2, CuO, and Ba(OH)2. Similar reactions will probably occur with nearly equal rapidity in all cuprate superconductors. We have used room-temperature and liquid N2 resistance measurements to study the stability of smaller surface area specimens (thin sheets). We have found that such specimens react slowly with humid air at room temperature and rapidly in air at 85 °C and 85% rel. humidity, the standard conditions used for accelerated humidity testing. The resultant end products are nonsuperconducting phases formed in from hours to days, depending on conditions. Furthermore, we have found that, while a plastic encapsulant considerably slowed such reactions, it did not eliminate them. The implications for both scientific experiments to characterize high transition temperature superconductors and for applications as well as possible remedies are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98683
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Barium sodium niobate (Ba(4+x)Na(2−2x)Nb10O30): crystallographic data and thermal expansion coefficients (1968)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 1 (1968), S. 290-292 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Accurate lattice parameters (at 25 and 48°C), density, thermal expansion coefficients, the indexed powder pattern, and optical data are given for Ba(4+x)Na(2−2x)Nb10O30, where x = 0.13±0.013, grown by pulling from a nominally stoichiometric melt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889868005522
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray determination of polarity sense by anomalous scattering at an absorption edge (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 27-32 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A technique is described for the determination of crystallographic polarity which is generally applicable to large polar crystals containing an element heavier than K. It is an extension and simplification of Cole & Stemple's method in which the intensities diffracted by (00 l) and (00\overline l) planes are compared at wavelengths close to an absorption edge of a constituent element. A definitive polarity determination may now be made without previously measuring or assuming values of Δf′ and Δf′′ at the edge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870005599
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  • 6
    Electronic Resource
    Electronic Resource
    Lithium tantalate single crystal stoichiometry (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 395-399 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Accurate lattice parameter, hydrostatic density and Curie temperature measurements have been made on lithium tantalate single crystals grown from different melt compositions. Crystal compositions were determined by comparing crystal Curie temperatures with those determined from well reacted ceramic specimens of known composition. These measurements showed that a stoichiometric melt produces nonstoichiometric crystals and that the congruently melting composition is 49.0 mole % Li2O. The resulting defect model for nonstoichiometric lithium tantalate is Li[1−(5−n)x]Ta(1+x)nxe−O3 where n∼2 and the existence region is 46.0 to 50.4 mole % Li2O at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870006490
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  • 7
    Electronic Resource
    Electronic Resource
    A method of preparation of powder samples for Debye–Scherrer–Hull X-ray diffraction (1972)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 5 (1972), S. 381-382 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889872009860
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    Paper (German National Licenses)
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