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Pressure dependence of the thermal and electrical conductivities of the intermetallic compounds AuCu and AuCu3
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1988 (English)In: Journal of Physics and Chemistry of Solids, ISSN 0022-3697, Vol. 49, no 4, 441-450 p.Article in journal (Refereed) Published
Abstract [en]

The thermal diffusivity, a, electrical resistivity, ρ, and Seebeck coefficient, S, of ordered and disordered AuCu3 and AuCu have been measured as functions of T and P in the range 100–300 K and 0–2 GPa, and the thermal conductivity, λ, has been calculated from the data for a. The experimental data for ρ agree well with literature data. The ρ dependence of ρ and λ differs significantly between ordered and disordered specimens, but apart from the effect of impurity scattering the disordered materials behave much like the noble metals. For the temperature-dependent part of p (and λ) the P dependence differs by a factor of 2–3 between ordered and disordered states. This is shown to result from the difference in electron band structure, as reflected also in the thermoelectric parameter ξ. The P dependence of the relatively large lattice thermal conductivity of these materials causes the Lorenz ratio L = λρ/T to increase with ρ in all cases.

Place, publisher, year, edition, pages
1988. Vol. 49, no 4, 441-450 p.
Keyword [en]
Thermal diffusivity, thermal conductivity, high pressure, electrical resistivity, Lorenz function, intermetallic compounds, alloys, gold-copper, copper-gold, AuCu, AuCu3, structural order, disorder, Seebeck coefficient, thermoelectric power, thermopower, lattice thermal conductivity
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-26759DOI: 10.1016/0022-3697(88)90105-9OAI: diva2:273952
Available from: 2009-10-26 Created: 2009-10-26 Last updated: 2009-12-11

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