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  • 1
    Electronic Resource
    Electronic Resource
    An improved comparative thermal conductivity apparatus for measurements at high temperatures (1991)
    Springer
    International journal of thermophysics 12 (1991), S. 563-576 
    Details
    ISSN: 1572-9567
    Keywords: comparative method ; inconel ; nickel ; pyrex ; pyroceram ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An apparatus developed for the measurement of thermal conductivity of solids at temperatures from 350 to 1250 K in air, vacuum, or any other controlled atmosphere is described. It is based on the steady-state axial heat flow comparative method and can be used for measurements of conductivities in the range 1 to 100 W·m−1·K−1. New heat source layout gives uniform heat flux across the specimen column, improving the accuracy of the measurements. The specimen stack is fixed in a rigid frame. It incorporates convection current breakers, eliminating thermal insulation of the stack and thereby considerably increasing the ease of specimen mounting. The accuracy of measurements was assessed by measuring the thermal conductivity of approved reference materials and is found to be within ±3%. The results of measurements on nickel of known purity are also presented. Error analysis of the system shows that the determinate error leaving the uncertainty in the thermal conductivity of the reference materials, is less than ±2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502369
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal conductivity of LaCoO3 (1983)
    Springer
    International journal of thermophysics 4 (1983), S. 183-188 
    Details
    ISSN: 1572-9567
    Keywords: LaCoO3 ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity of LaCoO3 was measured in air between 300 and 900 K. The conductivity increased sharply from 3.2 to 17.0 W · m−1 · K−1 in this temperature range and showed good agreement with previously published data. An excitonic mode of conduction due to the interaction of the high-low spin states of cobalt is found to be the main contribution to the measured thermal conductivity. Contributions of the other modes of conduction and the excitonic mean free path have been calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500141
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal conductivity of La2CuO4, La2NiO4, and Nd2CuO4 in the semiconducting and metallic phases (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 1091-1100 
    Details
    ISSN: 1572-9567
    Keywords: electrical conductivity ; La2CuO4 ; La2NiO4 ; Nd2CuO4 ; oxides ; phonons ; thermal conductivity ; thermal expansion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal conductivity of polycrystalline La2CuO4, La2NiO4, and Nd2CuO4 was measured in the temperature range 300–1000 K. No anomaly in thermal conductivity has been observed during the semiconductor-to-metal transition of La2NiO4 or in the metallic phases of La2CuO4 and La2NiO4. A change of slope has been found, however, in the thermal conductivity of La2CuO4 at the crystallographic transition. The thermal conductivity of the oxides is mainly phononic in this temperature range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502380
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    High-temperature thermal conductivity of NdCoO3 and GdCoO3 (1991)
    Springer
    International journal of thermophysics 12 (1991), S. 207-221 
    Details
    ISSN: 1572-9567
    Keywords: exciton formation energy ; GdCoO3 ; NdCoO3 ; thermal ; conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Thermal conductivity of NdCoO3 and GdCoO3 has been studied from 300 to 1200 K. The conductivity is mainly excitonic, arising from the interactions of the t2g−eg states of cobalt ions in the oxides and shows characteristic maxima at 1030 and 975 K, respectively, corresponding with their semiconductor-metal transition temperatures. Contributions to thermal conductivity by phononic, electronic, ambipolar, and excitonic modes of conduction are calculated from measured thermal and electrical conductivity data in this temperature range. The energy of exciton formation in both the compounds is found to be 0.11 eV, same as in the case of LaCoO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00506132
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    Paper (German National Licenses)
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