scholarly journals Thermal and Electrical Conductivities of Iron, Nickel, Titanium, and Zirconium at Low Temperatures

1956 ◽  
Vol 9 (2) ◽  
pp. 180 ◽  
Author(s):  
WRG Kemp ◽  
PG Klemens ◽  
GK White
Keyword(s):  
Low Temperatures ◽  
Pure Iron ◽  
Thermal Conduction ◽  
Nickel Titanium ◽  
Electrical Conductivities ◽  
Iron Nickel ◽  
Lattice Component

Measurements are reported of the thermal and electrical conductivities of iron, nickel, titanium, and zirconium down to 2 �K. These indicate that thermal conduction in pure iron and nickel is almost completely electronic. Titanium and zirconium exhibit an appreciable lattice component of thermal conduction. In the case of titanium this lattice component varies as T1.5.

Thermal and Electrical Conductivities of Sodium from 40 to 360 K

1972 ◽  
Vol 50 (12) ◽  
pp. 1386-1401 ◽  
Author(s):  
J. G. Cook ◽  
M. P. Van der Meer ◽  
M. J. Laubitz
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Low Temperatures ◽  
Characteristic Temperature ◽  
Published Data ◽  
Inelastic Electron ◽  
Conductivity Data ◽  
Electron Collisions ◽  
Electrical Conductivities ◽  
Flow Apparatus

We present data on the electrical and thermal resistivities and the thermopower of three pure Na specimens from 40 to 360 K. The measurements were made using a guarded longitudinal heat flow apparatus that had previously been calibrated with Au and Al. The specimens were placed in a vacuum environment using no solid inert liner.The electrical resistivity data indicate ΘR = 194 K. The thermal conductivity data show a 4% minimum near 70 K and an ice point value of 1.420 W/cm K. The reduced Lorenz function L/L0 agrees with published data at low temperatures but above 300 K levels off at approximately 0.91. On the basis of published data for liquid Na, L/L0 does not change by more than 3% at the melting point.The minimum in the thermal conductivity and a part of the high temperature deviations of L from L0 are tentatively ascribed to inelastic electron–phonon collisions having a characteristic temperature near that of longitudinal phonons. The possibility that electron–electron collisions further depress L at high temperatures is critically examined.

Fe-Ni-Ti (Iron-Nickel-Titanium)

2012 ◽  
Vol 33 (3) ◽  
pp. 238-239 ◽  
Author(s):  
V. Raghavan
Keyword(s):  
Nickel Titanium ◽  
Iron Nickel

Thermal and electrical conductivities of exfoliated graphite at low temperatures

Cryogenics ◽  
1973 ◽  
Vol 13 (4) ◽  
pp. 230-231 ◽  
Author(s):  
S.G. Hegde ◽  
E. Lerner ◽  
J.G. Daunt
Keyword(s):  
Low Temperatures ◽  
Exfoliated Graphite ◽  
Electrical Conductivities

scholarly journals Characterization of Thermal and Electrical Transport in 6.4 nm Au Films on Polyimide Film and Fiber Substrates

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Huan Lin ◽  
Aijing Kou ◽  
Jian Cheng ◽  
Hua Dong ◽  
Shen Xu ◽  
...  
Keyword(s):  
Electrical Transport ◽  
Thermal Conduction ◽  
Polyimide Film ◽  
Substrate Material ◽  
Organic Substrates ◽  
Metallic Films ◽  
Au Film ◽  
Electrical Conductivities ◽  
Thermal Technique

Abstract The surface and grain boundary scattering impact on the electrical and thermal conduction in the thin metallic films coated on organic substrates has not been studied thoroughly. In this work, we study heat and electron transport in the 6.4 nm thin Au films supported by polyimide (PI) substrate using the transient electro-thermal technique. Thermal and electrical conductivities of 6.4 nm thin Au film are much smaller than bulk value. The thermal and electrical conductivities of 6.4 nm Au film deposited on the PI fiber are reduced by 59.3% and 76.8% in the comparison with the value of bulk Au. For PI film, the reduction of thermal and electrical conductivities is 47.9% and 46.3%. Lorenz numbers of 6.4 nm Au film supported by PI fiber and PI film are 4.51 × 10−8 WΩK−2 and 2.12 × 10−8 WΩK−2, respectively. The thermal conductivities of PI fiber and PI film are 0.87 Wm−1K−1 and 0.44 Wm−1K−1. The results reveal that PI is a suitable substrate material in the flexible electronic devices field.

The mechanical properties of pure iron tested in compression over the temperature range 2 to 293 °K

1967 ◽  
Vol 261 (1121) ◽  
pp. 253-287 ◽  
Keyword(s):  
Mechanical Properties ◽  
Flow Stress ◽  
Strain Rate ◽  
Single Crystals ◽  
Yield Stress ◽  
Low Temperatures ◽  
Pure Iron ◽  
Constant Strain Rate ◽  
Frictional Stress ◽  
Strain And Strain Rate

The mechanical properties of pure iron single crystals and of polycrystalline specimens of a zone-refined iron have been measured in compression over the temperature and strain rate ranges 2.2 to 293 °K and 7 x 10 -7 to 7 x 10 -3 s -1 respectively. Various yield stress parameters were determined as functions of both temperature and strain rate, and the reversible changes in flow stress produced by isothermal changes of strain rate or by changes of temperature at constant strain rate were also measured as functions of temperature, strain and strain rate. Both the temperature variation of the flow stress and the strain rate sensitivity of the flow stress were generally identical for the single crystals ( ca. 0.005/M carbon) and the polycrystalline specimens ( ca. 9/M carbon). At low temperatures, the temperature dependence of the yield stress was smaller than that of the flow stress at high strains, probably because of the effects of mechanical twinning, but once again the behaviour of single and polycrystalline specimens was very similar. Below 10 °K, both the flow stress and the extrapolated yield stress were independent of temperature. The results show that macroscopic yielding and flow at low temperatures are both governed by the same deformation mechanism, which is not very impurity sensitive, even in the very low carbon range covered by the experiments. The flow stress near 0 °K is ca. 5.8 x 10 -3 u where [i is the shear modulus. On the basis of a model for thermally activated flow, the activation volume at low temperatures (high stresses) is found to be ca. 5 b 3 . The exponent in the empirical power law for the dislocation velocity against stress relation is ca. 3 near room temperature, but becomes quite large at low temperatures. The results indicate that macroscopic deformation at low temperatures is governed by some kind of lattice frictional stress (Peierls-Nabarro force) acting on dislocations.

scholarly journals The magnetic properties of some paramagnetic double sulphates at low temperatures

1923 ◽  
Vol 104 (728) ◽  
pp. 671-676 ◽  
Keyword(s):  
Ammonium Sulphate ◽  
Low Temperatures ◽  
Point Of Interest ◽  
Magnetic Dilution ◽  
Unit Cells ◽  
Iron Nickel ◽  
The Mean ◽  
Monovalent Ion ◽  
Paramagnetic Atoms ◽  
Double Sulphates

In a previous paper† an account was given of a series of measurements on compounds of ferrous iron, nickel and cobalt at low temperatures. One of the objects of that investigation was to determine whether the Δ in the Weiss law χ (T + Δ) = C, which is followed by these substances at not too Iow temperatures, is purely a function of the “ magnetic dilution " of the compound, as seemed probable from earlier measurements. It was shown that the problem is not so simple as it was thought to be at first, the run of the Δ's in general not corresponding exactly to that of the dilutions in the series of compounds—anhydrous sulphate, hydrated sulphate and ammonium double sulphate. Another point of interest was the relatively large value of Δ (== 22) in the case of cobalt ammonium sulphate, notwithstanding the great magnetic dilution of this substance. The investigation has now been extended by the measurement of the susceptibilities of the following substances : Cobalt potassium sulphate, cobalt rubidium sulphate and manganese ammonium sulphate. These compounds were investigated with the following objects in view. The former two substances, together with cobalt ammonium sulphate, form a series of isomorphous compounds which differ from one another only in the monovalent ion in the diamagnetic part of the molecule and in the actual dimensions of the unit cells of their structures. They would thus seem to be very suitable to employ in an endeavour to determine whether in a series of compounds of exactly similar constitution, in which only the relative dimensions of the unit cells vary from member to member, the Δ is definitely a function of the mean distance apart of the paramagnetic atoms in the crystal, i. e ., of the dilution of the substance. Furthermore, since cobalt ammonium sulphate and cobalt rubidium sulphate are almost exactly isostructural, it would be expected that the Δ's for the two compounds would be nearly equal unless the diamagnetic part of the molecule exerts an influence on the paramagnetic atom other than that of a mere diluent.

Ferromagnetic Resonance in Pure Iron at Low Temperatures

1966 ◽  
Vol 16 (24) ◽  
pp. 1099-1100 ◽  
Author(s):  
S. M. Bhagat ◽  
J. R. Anderson ◽  
L. L. Hirst
Keyword(s):  
Ferromagnetic Resonance ◽  
Low Temperatures ◽  
Pure Iron
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