Measurement of the transport properties of liquid Rb using automated equipment

1982 ◽  
Vol 60 (9) ◽  
pp. 1311-1316 ◽  
Author(s):  
J. G. Cook ◽  
M. P. van der Meer ◽  
D. J. Brown
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Melting Point ◽  
Elastic Scattering ◽  
Electron Scattering ◽  
Percent Level ◽  
Digital Voltmeter ◽  
Density Fluctuations ◽  
Ionic Density ◽  
Thermocouple Thermometry

Equipment to perform low-level thermocouple thermometry using a computer, a digital voltmeter, and very low thermal offset switching has been used to measure the thermal conductivity, electrical resistivity, and thermoelectric power of Rb from its melting point, near 313 K, to 650 K. The data obtained, which are accurate to the percent level, may be explained by combining the effect of the elastic scattering of electrons by ionic density fluctuations, and the effect of electron–electron scattering.

Electron–electron scattering and the transport properties of liquid potassium

1981 ◽  
Vol 59 (1) ◽  
pp. 25-34 ◽  
Author(s):  
J. G. Cook
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Solid State ◽  
Transport Properties ◽  
Melting Temperature ◽  
Electron Scattering ◽  
Density Fluctuations ◽  
Precision Measurements ◽  
Reported Data ◽  
Ionic Density

We report the results and interpretation of precision measurements of the thermal conductivity, electrical resistivity, and thermopower of potassium made from just below the melting temperature, 335.5 K, to 700 K. It is found that the Lorenz function is approximately 10% below the Sommerfeld value in the solid state, confirming previously reported data, that it increases approximately 4% upon melting, and that it then decreases slightly upon further heating to 700 K. All these features may be explained very well by the combined effect of electron–electron scattering and of scattering of electrons by ionic density fluctuations.

Transport properties of solid and liquid Cs

1982 ◽  
Vol 60 (12) ◽  
pp. 1759-1769 ◽  
Author(s):  
J. G. Cook
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Melting Point ◽  
Transport Properties ◽  
Thermoelectric Power ◽  
Electron Scattering ◽  
Thermal Resistivity

The thermal conductivity, electrical resistivity, and thermoelectric power of Cs have been measured from 40 K, through the melting point which is near 300 K, up to 600 K. The thermal resistivity of both solid and liquid Cs contains a contribution from electron–electron scattering, which agrees well with theory. The electrical resistivity shows an appreciable "premelting" effect, which is tentatively attributed to impurities.

THE LOW-TEMPERATURE THERMAL CONDUCTIVITY, ELECTRICAL RESISTIVITY, AND THERMOELECTRIC POWER OF DILUTE SILVER ALLOYS WITH MANGANESE

1966 ◽  
Vol 44 (10) ◽  
pp. 2293-2302 ◽  
Author(s):  
H. L. Malm ◽  
S. B. Woods
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Low Temperature ◽  
Thermoelectric Power ◽  
Electron Scattering ◽  
The Other ◽  
Temperature Measurements ◽  
Silver Alloys ◽  
Temperature Range ◽  
Dilute Alloy

Low-temperature measurements of electrical resistivity, thermal conductivity, and thermoelectric power on silver alloys containing 0.005, 0.067, 0.11, and 0.31 at.% of manganese are reported. The same specimens were used for the measurement of all properties over the temperature range from 2 to 25 °K. The well-known minimum and maximum are observed in the electrical resistivity of the three more concentrated alloys and the minimum is visible in the most dilute alloy near the lowest temperatures of measurement. Associated effects are observed in the other properties and their possible relationship to theoretical electron scattering mechanisms, particularly that of Kondo, is discussed.

The transport properties of rubidium, and electron–electron scattering

1979 ◽  
Vol 57 (6) ◽  
pp. 871-883 ◽  
Author(s):  
J.G. Cook
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Transport Properties ◽  
Thermoelectric Power ◽  
Electron Scattering ◽  
Strong Evidence ◽  
Freezing Point ◽  
Thermal Contraction ◽  
Thomas Fermi

The electrical resistivity, thermal conductivity, and thermoelectric power of Rb have been measured between 40 and 300 K. Two of the samples were bare, to avoid thermal contraction difficulties; the softness of these samples necessitated further, calibration, measurements on a third sample in glass, just below the freezing point. The electrical resistivity values agree well with published values of Dugdale and Phillips. The Lorenz function, not previously examined in detail above 25 K, shows strong evidence of electron–electron scattering, of a strength intermediate to that calculated by Kukkonen for Thomas–Fermi screening, and for Geldart–Taylor screening. Such scattering appears to have affected the thermoelectric power as well.

Electron–electron scattering in potassium

1979 ◽  
Vol 57 (8) ◽  
pp. 1216-1223 ◽  
Author(s):  
J. G. Cook
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Temperature Dependence ◽  
Thermoelectric Power ◽  
Electron Scattering ◽  
Noble Metals ◽  
Thermal Resistivity ◽  
Consistent Picture ◽  
Preliminary Study ◽  
Increasing Temperature

The electrical resistivity ρ, thermal conductivity κ, and thermoelectric power S have been measured for two bare K specimens between 80 and 330 K. The data fully support the main conclusions of an earlier, preliminary study by Cook and Laubitz. The Lorenz function L = κρ/T does not approach the Sommerfeld value L0 with increasing temperature. Both the magnitude and temperature dependence of L–L0 indicate the presence of an added term Wee in the thermal resistivity, due to electron–electron scattering. Such scattering also affects S. It is shown that the data for K, together with published values of B = Wee/T for Na, Rb, and the noble metals, form a consistent picture of electron–electron scattering in the monovalent metals above the Debye temperature.

Electron Scattering in Solids

1990 ◽  
Vol 48 (2) ◽  
pp. 4-5
Author(s):  
Ryuichi Shimizu ◽  
Ze-Jun Ding
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Angular Distribution ◽  
Elastic Scattering ◽  
Electron Scattering ◽  
Cross Sections ◽  
Expansion Method ◽  
Electron Excitation ◽  
Partial Wave Expansion ◽  
Backscattered Electrons

Monte Carlo simulation has been becoming most powerful tool to describe the electron scattering in solids, leading to more comprehensive understanding of the complicated mechanism of generation of various types of signals for microbeam analysis.The present paper proposes a practical model for the Monte Carlo simulation of scattering processes of a penetrating electron and the generation of the slow secondaries in solids. The model is based on the combined use of Gryzinski’s inner-shell electron excitation function and the dielectric function for taking into account the valence electron contribution in inelastic scattering processes, while the cross-sections derived by partial wave expansion method are used for describing elastic scattering processes. An improvement of the use of this elastic scattering cross-section can be seen in the success to describe the anisotropy of angular distribution of elastically backscattered electrons from Au in low energy region, shown in Fig.l. Fig.l(a) shows the elastic cross-sections of 600 eV electron for single Au-atom, clearly indicating that the angular distribution is no more smooth as expected from Rutherford scattering formula, but has the socalled lobes appearing at the large scattering angle.

Erratum: Electron scattering from H2O: Elastic scattering [Phys. Rev. A78, 052710 (2008)]

2013 ◽  
Vol 87 (4) ◽  
Author(s):  
M. A. Khakoo ◽  
H. Silva ◽  
J. Muse ◽  
M. C. A. Lopes ◽  
C. Winstead ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Electron Scattering

Effects of Nb doping on thermoelectric properties of Zn4Sb3 at high temperatures

2009 ◽  
Vol 24 (2) ◽  
pp. 430-435 ◽  
Author(s):  
D. Li ◽  
H.H. Hng ◽  
J. Ma ◽  
X.Y. Qin
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
High Temperatures ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Thermoelectric Performance ◽  
Temperature Range ◽  
A Value ◽  
Nb Doping ◽  
Thermal Conductivities

The thermoelectric properties of Nb-doped Zn4Sb3 compounds, (Zn1–xNbx)4Sb3 (x = 0, 0.005, and 0.01), were investigated at temperatures ranging from 300 to 685 K. The results showed that by substituting Zn with Nb, the thermal conductivities of all the Nb-doped compounds were lower than that of the pristine β-Zn4Sb3. Among the compounds studied, the lightly substituted (Zn0.995Nb0.005)4Sb3 compound exhibited the best thermoelectric performance due to the improvement in both its electrical resistivity and thermal conductivity. Its figure of merit, ZT, was greater than the undoped Zn4Sb3 compound for the temperature range investigated. In particular, the ZT of (Zn0.995Nb0.005)4Sb3 reached a value of 1.1 at 680 K, which was 69% greater than that of the undoped Zn4Sb3 obtained in this study.

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