Electrical resistivity and structure of liquid Al-Ge alloys

Gasser, J.G.; Mayoufi, M.; Bellissent‐Funel, Marie‐Claire

doi:10.1088/0953-8984/1/13/013

Cited by 19 publications

(8 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(a) and (b), for pure liquid Ge, the parameter which fits the X-ray experiment is A Ge % 0, while A Ge % 1 is a better choice for neutron data. In addition, we note that the good agreement between the present local model and the X-ray experiment for pure Ge is in line with earlier findings that the structure factor of this metal is well described by local as well as non-local models [2,18]. Moreover the modern ab initio molecular dynamics approaches, depending on the authors, showed either better agreement with the X-ray diffraction data or with neutron diffusion data [5][6][7].…”

Section: Resultssupporting

confidence: 90%

See 1 more Smart Citation

Structure of liquid metal alloys: Transferability of local pseudopotentials – A preliminary study

Slimane

Nigon²,

Takhtoukh

et al. 2007

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 90%

“…The corresponding partial pair correlation functions are calculated using the Monte Carlo method and the partial structure factors are obtained by Fourier transform. In order to compare the theory with neutron experiments [18], the total structure factors are calculated from the Faber-Ziman definition of the structure factors S ij :…”

Section: Resultsmentioning

confidence: 99%

Structure of liquid metal alloys: Transferability of local pseudopotentials – A preliminary study

Slimane

Nigon²,

Takhtoukh

et al. 2007

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

“…Electrical resistivity of Al was studied many times, but a range of reported electrical resistivity data is very large [10][11][12]. The present electrical conductivity values taken from our previous work [13] are very close to the values reported in [14] (converted from resistivity) and agree generally with [14] within a total experimental uncertainty ±2 %.…”

Section: Resultssupporting

confidence: 78%

Thermophysical properties of some liquid binary Mg-based alloys

Plevachuk

Sklyarchuk

Pottlacher³

et al. 2017

J min metall B Metall

View full text Add to dashboard Cite

In this study, some structure-sensitive thermophysical properties, namely, electrical conductivity, thermal conductivity and thermoelectric power of liquid binary alloys Al33.3Mg66.7, Mg47.6Zn52.4 and Mg33.3Zn66.7 (all in wt.%), as the most promising cast alloys to fabricate components for cars, aircraft and other complex engineering products, were investigated. The electrical conductivity and thermoelectric power were measured in a wide temperature range by the four-point contact method. The thermal conductivity was measured by the steady-state concentric cylinder method. The obtained results are compared with literature experimental and calculated data.

show abstract

“…Results on Al-base alloys have been reported. [4,5] For the calculation of the thermal conductivity using the Wie-demann±Franz law the value of the Lorenz number is needed. Experimental results of measurements on metal melts [6,7] have shown that the Lorenz number can be assumed to be close to the theoretical value of Sommerfeld because in the liquid state of metals the heat transport is dominated by free electrons.…”

mentioning

confidence: 99%

Measurement of the Electric Resistivity of Metals up to and Above the Melting Temperature

Brandt¹,

Neuer

2003

Adv Eng Mater

View full text Add to dashboard Cite

Thermophysical properties of metals in the melting range are crucial to optimize processes e.g., powder production by atomizing or casting by means of simulation programs. The demand and the availability of these properties is summarized in. [1] Beside viscosity and surface tension the knowledge of the thermal conductivity is of particular importance, however, its direct measurement is extremely difficult because of the long measuring times to reach thermal equilibrium and, therefore, possible chemical reactions between crucible and specimen. Also contact resistance between crucible and sample and convection in the molten state may cause measurement errors. Indirect determination is possible by measurement of the thermal diffusivity and calculation of the thermal conductivity if specific heat capacity and density of the material are known. Results on Al-base alloys have been published by R. E. Taylor and coworkers. [2,3] At thermal diffusivity also problems with the crucible arise by additional heat flow through the crucible and crucible/melt interaction. Such measurement uncertainties are negligible if the electric resistivity is measured. Results on Al-base alloys have been reported. [4,5] For the calculation of the thermal conductivity using the Wiedemann±Franz law the value of the Lorenz number is needed. Experimental results of measurements on metal melts [6,7] have shown that the Lorenz number can be assumed to be close to the theoretical value of Sommerfeld because in the liquid state of metals the heat transport is dominated by free electrons. For this reason, a measurement apparatus has been developed to measure the electric resistivity.The four probe technique was applied to measure the electric resistivity, whereby a cylindrical sample of diameter D = 5 mm is loaded by a direct current I. The electric resistivity r is determined by measuring the voltage drop DU between two probes positioned at a distance of L = 50 mm to 80 mm using the following equation:All these values can be measured with a relatively high accuracy. Systematic errors at the determination of the voltage drop DU because of thermoelectric voltage between the sample and the electrodes can be eliminated by providing a commutator at the power supply in order to change the direction of the electric current and using the mean of the two values in both directions. Measurements in the molten state of a metal are much more difficult than measurements only on solids because the sample must be kept inside of a ceramic tube. This involves that geometric data and sample temperature are more difficult to be determined and the complicate mechanics of the electrodes may lead to increased measurement errors. Therefore, two apparatus have been constructed: one for measurements on solids only at moderate temperatures where ideal conditions can be realized for precise measurements and the second to measure in the solid and in the molten state. By comparing the results in the overlapping temperature range the values of the measurements in the ceramic tube...

show abstract

Electrical resistivity and structure of liquid Al-Ge alloys

Cited by 19 publications

References 31 publications

Structure of liquid metal alloys: Transferability of local pseudopotentials – A preliminary study

Structure of liquid metal alloys: Transferability of local pseudopotentials – A preliminary study

Thermophysical properties of some liquid binary Mg-based alloys

Measurement of the Electric Resistivity of Metals up to and Above the Melting Temperature

Contact Info

Product

Resources

About