Relationship between Stress and Temperature Dependence of Ultrasonic Shear Velocity

1984 ◽  
pp. 393-403
Author(s):  
N. Chandrasekaran ◽  
K. Salama
Keyword(s):  
Temperature Dependence ◽  
Shear Velocity ◽  
Ultrasonic Shear

Ultrasonic Shear Velocity Anomalies in Bulk Thallium-1212 High Temperature Superconductor

1997 ◽  
Vol 11 (08) ◽  
pp. 359-365 ◽  
Author(s):  
R. Abd-Shukor
Keyword(s):  
High Temperature ◽  
High Temperature Superconductor ◽  
Thermal Hysteresis ◽  
High Temperature Superconductivity ◽  
High Temperature Superconductors ◽  
Shear Velocity ◽  
Pronounced Change ◽  
Velocity Anomalies ◽  
Ultrasonic Shear

Ultrasonic shear velocity of bulk TlSr2(Ca, Cr)Cu2O7 and (Tl, Bi)Sr2(Ca, Cr)Cu2O7 high temperature superconductors has been measured between 80 K and above 200 K at 8 MHz. A hardening trend was observed in both samples as the temperature was lowered. A large thermal hysteresis was observed in the TlSr2(Ca, Cr)Cu2O7 (density 3.74 g/cm3) but very much suppressed in the (Tl, Bi)Sr2(Ca, Cr)Cu2O7 (density 5.40 g/cm3) sample. Shear velocity hysteresis in these materials is very much determined by the density and microstructure and may not be directly related to high temperature superconductivity. A pronounced change in the shear velocity at about 160–190 K signifying a softening tendency was observed in the (Tl, Bi)Sr2(Ca, Cr)Cu2O7 material. Some possible mechanisms of the origin of these anomalies are discussed.

Temperature Dependence of the Critical Electron Dose for Fatty Acid Monolayers

1982 ◽  
Vol 40 ◽  
pp. 78-79
Author(s):  
Kenneth H. Downing ◽  
Robert M. Glaeser
Keyword(s):  
Electron Beam ◽  
Fatty Acid ◽  
Inelastic Scattering ◽  
Temperature Dependence ◽  
Structural Damage ◽  
Direct Result ◽  
Second Step ◽  
Strong Temperature Dependence ◽  
Electron Dose ◽  
Covalent Bonds

The structural damage of molecules irradiated by electrons is generally considered to occur in two steps. The direct result of inelastic scattering events is the disruption of covalent bonds. Following changes in bond structure, movement of the constituent atoms produces permanent distortions of the molecules. Since at least the second step should show a strong temperature dependence, it was to be expected that cooling a specimen should extend its lifetime in the electron beam. This result has been found in a large number of experiments, but the degree to which cooling the specimen enhances its resistance to radiation damage has been found to vary widely with specimen types.

Temperature Dependence of Magnetic Domains and Wall Structures

1972 ◽  
Vol 30 ◽  
pp. 496-497
Author(s):  
Sonoko Tsukahara ◽  
Tadami Taoka ◽  
Hisao Nishizawa
Keyword(s):  
Temperature Dependence ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Iron Film ◽  
Objective Lens ◽  
Lorentz Microscopy ◽  
Domain Structures ◽  
Wall Structures ◽  
Crystal Films ◽  
Metallurgical Structure

The high voltage Lorentz microscopy was successfully used to observe changes with temperature; of domain structures and metallurgical structures in an iron film set on the hot stage combined with a goniometer. The microscope used was the JEM-1000 EM which was operated with the objective lens current cut off to eliminate the magnetic field in the specimen position. Single crystal films with an (001) plane were prepared by the epitaxial growth of evaporated iron on a cleaved (001) plane of a rocksalt substrate. They had a uniform thickness from 1000 to 7000 Å.The figure shows the temperature dependence of magnetic domain structure with its corresponding deflection pattern and metallurgical structure observed in a 4500 Å iron film. In general, with increase of temperature, the straight domain walls decrease in their width (at 400°C), curve in an iregular shape (600°C) and then vanish (790°C). The ripple structures with cross-tie walls are observed below the Curie temperature.

Temperature dependence of generation-recombination noise in p-n junctions

2002 ◽  
Vol 12 (3) ◽  
pp. 71-74
Author(s):  
J. A. Jiménez Tejada ◽  
A. Godoy ◽  
A. Palma ◽  
P. Cartujo
Keyword(s):  
Temperature Dependence

Temperature Dependence of Single Chain Properties in a Binary Polymer Blend

1996 ◽  
Vol 6 (2) ◽  
pp. 187-194 ◽  
Author(s):  
M. Müller ◽  
K. Binder
Keyword(s):  
Temperature Dependence ◽  
Polymer Blend ◽  
Single Chain ◽  
Binary Polymer

Temperature dependence of spin fluctuation scattering of neutrons on pyrrhotite

1964 ◽  
Vol 25 (5) ◽  
pp. 634-641 ◽  
Author(s):  
Sz. Kraśnicki ◽  
A. Wanic ◽  
Ž. Dimitrijević ◽  
R. Maglić ◽  
V. Marković ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Spin Fluctuation

TEMPERATURE DEPENDENCE OF PHOTOCONDUCTIVITY IN CdCr2Se4

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-934-C1-936 ◽  
Author(s):  
S. B. BERGER ◽  
A. AMITH
Keyword(s):  
Temperature Dependence
Sign in / Sign up

Export Citation Format

Share Document