Measurement of the Electrical Resistivity and Thermal Conductivity of High Purity Aluminum in Magnetic Fields

1990 ◽  
pp. 679-686 ◽  
Author(s):  
J. P. Egan ◽  
R. W. Boom
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Magnetic Fields ◽  
High Purity ◽  
High Purity Aluminum

Anisotropy of Residual Electrical Resistivity in High-Purity Aluminum Single Crystals

1993 ◽  
Vol 62 (12) ◽  
pp. 4178-4181 ◽  
Author(s):  
Eiji Hashimoto ◽  
Yoshitake Ueda ◽  
Hirofumi Tamura ◽  
Takao Kino
Keyword(s):  
Electrical Resistivity ◽  
Single Crystals ◽  
High Purity ◽  
High Purity Aluminum

Physical Property Evaluation for High Purity Niobium and Tantalum Rare Metals

2007 ◽  
Vol 26-28 ◽  
pp. 1059-1062 ◽  
Author(s):  
Il Ho Kim ◽  
Jung Il Lee ◽  
G.S. Choi ◽  
J.S. Kim
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Low Temperature ◽  
Temperature Dependence ◽  
High Purity ◽  
Phonon Scattering ◽  
Physical Property ◽  
Rare Metals ◽  
Metallic Behavior ◽  
Property Evaluation

Thermal, electrical and mechanical properties of high purity niobium and tantalum refractory rare metals were investigated to evaluate the physical purity. Higher purity niobium and tantalum metals showed lower hardness due to smaller solution hardening effect. Temperature dependence of electrical resistivity showed a typical metallic behavior. Remarkable decrease in electrical resistivity was observed for a high purity specimen at low temperature. However, thermal conductivity increased for a high purity specimen, and abrupt increase in thermal conductivity was observed at very low temperature, indicating typical temperature dependence of thermal conductivity for high purity metals. It can be known that reduction of electron-phonon scattering leads to increase in thermal conductivity of high purity niobium and tantalum metals at low temperature.

THERMAL CONDUCTIVITY AND ELECTRICAL RESISTIVITY OF HIGH-PURITY COPPER FROM 78 TO 400 °K

1967 ◽  
Vol 45 (12) ◽  
pp. 3849-3865 ◽  
Author(s):  
J. P. Moore ◽  
D. L. McElroy ◽  
R. S. Graves
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Heat Flow ◽  
Seebeck Coefficient ◽  
High Purity ◽  
Polycrystalline Copper ◽  
Copper Specimen ◽  
Monovalent Metal ◽  
Axial Heat ◽  
Purity Copper

A guarded-axial heat-flow technique for accurately measuring thermal conductivity, electrical resistivity, and Seebeck coefficient from 78 to 400 °K on small rod samples is described in detail. Results on a 99.999% pure polycrystalline copper specimen (ρ273.16°K/ρ4.2°K = 9.0 × 102) are compared with the results of previous investigators.The behavior of the electrical resistivity and the thermal conductivity is discussed in terms of existing theoretical equations. Although copper is a relatively simple monovalent metal, little agreement between the experimental thermal conductivity results and theory was found. The behavior of the experimental electrical resistivity from 100 to 1 200 °K was explained in terms of an approximation to the Bloch-Grüneisen equation.

On the Boundedness of the Dimensionless Index of Performance of a Nernst Effect Generator

1963 ◽  
Vol 30 (2) ◽  
pp. 291-294
Author(s):  
S. W. Angrist
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Magnetic Fields ◽  
Dimensionless Quantity ◽  
Nernst Effect ◽  
Strong Magnetic Fields ◽  
Weak Magnetic Fields ◽  
Effect Generator

The author, in an earlier paper, analyzed a Nernst effect generator by the usual thermodynamic methods and found that a bound of unity arises on the dimensionless quantity θT where θ is given as the square of the product of the Nernst coefficient and magnetic field divided by the thermal conductivity and electrical resistivity. By application of the appropriate equations of semiconductor theory this bound is shown to be justified for four limiting cases: Weak magnetic fields considering both extrinsic and intrinsic materials, and strong magnetic fields considering both extrinsic and intrinsic materials.

THE THERMAL CONDUCTIVITY OF PLATINUM BETWEEN 300 AND 1 000 °K

1966 ◽  
Vol 44 (12) ◽  
pp. 3173-3183 ◽  
Author(s):  
M. J. Laubitz ◽  
M. P. van der Meer
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
High Temperature ◽  
High Temperatures ◽  
Fermi Energy ◽  
High Purity ◽  
Lorenz Number ◽  
Increasing Function

The thermal conductivity of high-purity platinum was measured between 300 and 1 000 °K. The results obtained agree very well with the previously reported work of Bode and of Martin and Sidles, but at higher temperatures are in definite disagreement with the results of Powell and Tye. The observed variation of the thermal conductivity with temperature implies that at high temperatures the (electronic) Lorenz number of platinum is an increasing function of temperature, exceeding in magnitude the Sommerfeld value. Such behavior of the Lorenz number can be understood qualitatively if one assumes a low Fermi energy for platinum, an assumption usually made to account for the behavior of its high-temperature electrical resistivity.

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