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  • 2020-2021
  • 2015-2019  (90)
  • 1990-1994  (47)
  • 1980-1984  (43)
  • 1950-1954  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Equilibrium oxygen potential for the decomposition of YBa2Cu4O8 (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 511-513 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: On lowering the chemical potential of diatomic oxygen, the compound YBa2Cu4O8 was found to decompose into a mixture of YBa2Cu3O6+x and CuO. The equilibrium oxygen potential corresponding to this decomposition has been measured from 870 to 1150 K using a solid-state cell incorporating yttria-stabilized zirconia as the solid electrolyte and pure oxygen at a pressure of 1.01×105 Pa as the reference electrode: Pt, O'2||YBa2Cu4O8+YBa2Cu3O6+x+CuO(parallel)(Y2O3) ZrO2(parallel)O2(1.01×105 Pa), Pt. The low oxygen potential boundary for the stability of YBa2Cu4O8 can be represented by ΔμO2=−238 900+207.7 T(±800) J mol−1. At the standard pressure of oxygen (1.01×105 Pa) the decomposition occurs at 1150 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103635
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  • 2
    Electronic Resource
    Electronic Resource
    Fertilizers (1950)
    s.l. : American Chemical Society
    Analytical chemistry 22 (1950), S. 215-221 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60038a004
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  • 3
    Electronic Resource
    Electronic Resource
    Phase relations and thermodynamic properties of condensed phases in the system calcium-copper-oxygen (1993)
    s.l. : American Chemical Society
    Chemistry of materials 5 (1993), S. 1669-1675 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00035a014
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  • 4
    Electronic Resource
    Electronic Resource
    Fertilizer-Pesticide Mixtures (1954)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 2 (1954), S. 970-976 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60039a002
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  • 5
    Electronic Resource
    Electronic Resource
    Spores and Tracheids of Vascular Plants from the Vindhyan System, India: the Advent of Vascular Plants (1953)
    [s.l.] : Nature Publishing Group
    Nature 172 (1953), S. 166-167 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Pursuing these studies further, specimens of the Suket Shales (containing well-preserved specimens of Fermoria) belonging to the upper part of the Semri series1 of the Lower Vindhyans, near Rampura (lat. 24 28'; long. 75 26'), Central India (now Madhya Bharat), were treated with hydrofluoric acid ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/172166a0
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  • 6
    Electronic Resource
    Electronic Resource
    The mobility of oxygen ions in CaF2 (1990)
    Springer
    Journal of applied electrochemistry 20 (1990), S. 294-300 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The a.c. conductivity of CaF2 samples containing a fine dispersion of CaO particles has been measured in the temperature range 630 to 1100 K. The conductivity of the dispersed solid electrolyte is two orders of magnitude higher than that for pure polycrystalline CaF2 in the middle of the temperature range. Transport measurements on pure single crystals of CaF2 and polycrystalline samples, with and without CaO dispersion, using Fe+FeO and pure Fe as electrodes, clearly indicate that fluorine ions are the only migrating ionic species with a transport number of almost unity, contrary to the suggestion of Chou and Rapp [1, 2]. The enhanced conductivity of the dispersed solid electrolyte probably arises from two effects. A small solubility of oxygen in CaF2 results in an increase in the fluorine vacancy concentration and conductivity. Adsorption of fluorine ions on the surface of the dispersed particles of CaO results in a space charge region around each particle with enhanced conductivity. Measurements on a galvanic cell incorporating CaF2 as the solid electrolyte and oxide electrodes show that the e.m.f. is a function of the activity of CaO at the electrode/electrolyte interface. The response to an oxygen potential gradient is, therefore, through an exchange reaction, which establishes an equivalent fluorine potential at the electrode/electrolyte interface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01033608
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  • 7
    Electronic Resource
    Electronic Resource
    Sulphur potential measurements with a two-phase sulphideoxide electrolyte (1983)
    Springer
    Journal of applied electrochemistry 13 (1983), S. 55-67 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The open circuit potentials of the galvanic cell,Pt (or Au)¦(Ar + H2S + H2)′∥CaS + ZrO2(CaO)∥ (Ar + H2S+ H2)″£t (or Au) has been measured in the temperature range 1000 to 1660 K and PH2S:PH 2 ratios from 1.73×10−5 to 2.65×10−1. The solid electrolyte consists of a dispersion of calcium sulphide in a matrix of calcia-stabilized zirconia. The surface of the electrolyte is coated with a thin layer of calcium sulphide to prevent the formation of water vapour by reaction of hydrogen sulphide with calcium oxide or zirconia present in the electrolyte. The use of a ‘point electrode’ with a catalytically active tip was necessary to obtain steady emfs. At low temperatures and high sulphur potentials the emfs agreed with the Nernst equation. Deviations were observed at high temperatures and low sulphur potentials, probably due to the onset of significant electronic conduction in the oxide matrix of the electrolyte. The values of oxygen and sulphur potentials at which the electronic conductivity is equal to ionic conductivity in the two-phase electrolyte have been evaluated from the emf response of the cell. The sulphide-oxide electrolyte is unsuitable for sulphur potential measurements in atmospheres with high oxygen potentials, where oxidation of calcium sulphide may be expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00615887
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  • 8
    Electronic Resource
    Electronic Resource
    Decomposition of β-alumina in an oxygen potential gradient (1983)
    Springer
    Journal of applied electrochemistry 13 (1983), S. 469-472 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Single phase sodiumβ-alumina solid electrolyte was found to undergo isothermal phase separation in electrochemical cells, where a large oxygen potential gradient was imposed across the electrolyte and electrodes, not reversible to sodium ions, were short circuited. The experimental conditions and evidence of decomposition are outlined and a thermodynamic explanation for the phenomenon is given. This finding may lead to new methods for making multi-layered ceramic materials involving ionic conductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617521
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  • 9
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    Cost Manipulation Incentives Under Cost Reimbursement: Pension Costs for Defense Contracts (1992)
    Menasha, Wis. : Periodicals Archive Online (PAO)
    The Accounting Review. 67:4 (1992:Oct.) 691 
    Details
    ISSN: 0001-4826
    Topics: Economics
    Notes: A FORUM AN ACCOUNTING FOR DEFENSE CONTRACTS
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5030-1992-067-04-000003
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  • 10
    Electronic Resource
    Electronic Resource
    Sediment-induced amplification and the collapse of the Nimitz Freeway (1990)
    [s.l.] : Nature Publishing Group
    Nature 344 (1990), S. 853-855 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/344853a0
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