Nonlinear concentration dependence of the low-temperature thermal resistivity in metals containing impurity atoms

1975 ◽  
Vol 69 (1) ◽  
pp. 301-306 ◽  
Author(s):  
Yu. Kagan ◽  
A. P. Zhernov ◽  
Kh. M. Pashaev
Keyword(s):  
Low Temperature ◽  
Concentration Dependence ◽  
Thermal Resistivity ◽  
Impurity Atoms

LOW-TEMPERATURE RECOVERY OF DEFORMED ALUMINUM

1964 ◽  
Vol 42 (10) ◽  
pp. 1890-1901 ◽  
Author(s):  
M. L. Swanson
Keyword(s):  
Low Temperature ◽  
Impurity Content ◽  
Stage I ◽  
Stage Ii ◽  
Recovery Stage ◽  
Degree Of Deformation ◽  
Resistivity Measurements ◽  
Impurity Atoms ◽  
Interstitial Defects ◽  
Dislocation Pinning

The isochronal recovery of deformed polycrystalline Al was measured from 4 to 300 °K by means of residual electrical resistivity measurements. A well-defined recovery stage was observed between 60 and 100 °K (stage IIA); it has also been observed after neutron irradiation, but not after electron irradiation (Sosin 1963). This stage was enhanced by increasing the deformation or introducing quenched-in vacancies, and was suppressed by impurity atoms. These results can be explained by di-interstitial migration. The recovery below 60 °K (stage I) amounted to approximately 5%, and was independent of impurity content or degree of deformation. Both stage I and stage IIA recovery were greatly increased by a prior deformation and low-temperature anneal. A similar increase was observed for Au. This enhancement was attributed to a change in deformation mechanism because of dislocation pinning, which resulted in the formation of a preponderance of interstitial defects.

Observation of low-temperature diffusion of aluminum impurity atoms in hydrogen-implanted silicon

1998 ◽  
Vol 32 (4) ◽  
pp. 375-381 ◽  
Author(s):  
Yu. V. Gorelkinskii ◽  
B. N. Mukashev ◽  
Kh. A. Abdullin
Keyword(s):  
Low Temperature ◽  
Impurity Atoms ◽  
Temperature Diffusion

Field Dependent Susceptibility and Localized Spin Fluctuations in PdRhNi Alloys

1975 ◽  
Vol 53 (2) ◽  
pp. 145-150 ◽  
Author(s):  
R. W. Cochrane ◽  
F. T. Hedgcock ◽  
J. P. Tidman ◽  
M. J. Zuckermann
Keyword(s):  
Low Temperature ◽  
Magnetic Fields ◽  
Concentration Dependence ◽  
Spin Fluctuation ◽  
Spin Fluctuations ◽  
Magnetization Measurements ◽  
Scaling Parameter ◽  
Local Spin ◽  
Field Dependent

Low temperature magnetization measurements in magnetic fields up to 55 kOe are reported for a series of PdRhNi alloys containing 1 to 7 at.% Rh and up to 1 at.% Ni. These data indicate a critical Ni concentration for ferromagnetism close to 2 at.%. Comparison of the field and concentration dependence of the susceptibility to the magnetoresistance data of Purwins et al. reveals that the coefficient of the T2 local spin fluctuation resistivity scales directly with the nickel susceptibility. Experimentally, the scaling parameter varies only slightly with Rh concentration, a result which extends to the binary PdNi alloys.

scholarly journals Investigation of the Thermo-Physical and Mechanical Properties of Coir and Sugarcane Bagasse for Low Temperature Insulation

2021 ◽  
Vol 6 (4) ◽  
pp. 340-356
Author(s):  
Mustapha Ndagi ◽  
Ajiboye Tajudeen Kolawole ◽  
Fabiyi Mustapha Olawale ◽  
Abdulkareem Sulaiman
Keyword(s):  
Thermal Conductivity ◽  
Particle Size ◽  
Low Temperature ◽  
Sugarcane Bagasse ◽  
Control Sample ◽  
Gum Arabic ◽  
Absorption Capacity ◽  
Thermal Resistivity ◽  
Insulating Materials ◽  
Insulating Material

This research  reports on the suitability of Agricultural bi-products as low temperature thermal insulating materials to replace synthetic insulating materials like polyurethane used in food warmers and ice coolers. Coir and sugarcane bagasse chosen for this research was based on literature review and local availability of materials. Coir was obtained from Badagry, Lagos State and Sugarcane bagasse obtained from Batati, Niger State, the materials were washed, sun dried for three days and cut into smaller pieces before being blended into smaller particles using an electric blender. The blended materials (Coir and Bagasse) were sieved into two different sieve size of 0.5 mm and 1.0 mm respectively.  The particles sizes were then combined into blend ratios of 50/50, 60/40, and 70/30 using Gum Arabic as binder. Thermal conductivity test showed that 1.0 mm particle size coir mixed with sugarcane bagasse has the lowest thermal conductivity of 0.01467 W/mK whilst that of 0.5 mm particle size has thermal conductivity of 0.01472 W/mK this is lower compared to the measured thermal conductivity of the polyurethane control sample of 0.01832 W/mK. Sample F (1.0 mm particle size,70% coir and 30% bagasse) with a thermal diffusivity of 5.15  m²/s, water absorption capacity of 410 %, UTS of 0.219 MPa, Compressive strength of 0.583 MPa, Specific heat capacity of 1141.3 J/kgK and thermal resistivity of 68.16 W/m/K is most suitable replacement for polyurethane as low temperature thermal insulator. This is corroborated by the performance evaluation test with carried out between polyurethane lined food warmer and bio-composite lined food warmer. The two test samples have close ice melt rate values and the polyurethane slightly edge the Bio-composite insulating material by 1.2 % in efficiency. The edge in efficiency can be accepted as all materials used in the development of the bio-composite insulating material are completely bio-degradable and environmentally friendly.

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