Time and Temperature Dependence of Irradiation Effects in Solid Dielectrics

1967 ◽  
Vol 38 (10) ◽  
pp. 3904-3907 ◽  
Author(s):  
R. G. Brown
Keyword(s):  
Temperature Dependence ◽  
Irradiation Effects ◽  
Solid Dielectrics

Strong Temperature Dependence of Irradiation Effects in Organic Layers

2004 ◽  
Vol 93 (17) ◽  
Author(s):  
P. Feulner ◽  
T. Niedermayer ◽  
K. Eberle ◽  
R. Schneider ◽  
D. Menzel ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Strong Temperature Dependence ◽  
Irradiation Effects ◽  
Organic Layers

Strong temperature dependence of irradiation effects in organic layers

2005 ◽  
Vol 593 (1-3) ◽  
pp. 252-255 ◽  
Author(s):  
P. Feulner ◽  
T. Niedermayer ◽  
K. Eberle ◽  
R. Schneider ◽  
D. Menzel ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Strong Temperature Dependence ◽  
Irradiation Effects ◽  
Organic Layers

Interpretation of Irradiation Effects on the Fracture Toughness of a Pressure Vessel Steel in Terms of Crack Tip Stress Analysis

1976 ◽  
Vol 98 (1) ◽  
pp. 30-35 ◽  
Author(s):  
D. M. Parks
Keyword(s):  
Fracture Toughness ◽  
Tensile Stress ◽  
Temperature Dependence ◽  
Pressure Vessel ◽  
Fracture Criterion ◽  
Pressure Vessel Steel ◽  
Flow Properties ◽  
Irradiation Effects ◽  
Vessel Steel ◽  
Strain Fracture

The model of Ritchie, Knott, and Rice [10], relating the critical tensile stress for initiation of unstable cleavage fracture of mild steel to the cryogenic temperature-dependence of plane strain fracture toughness (KIc), is applied to a pressure vessel steel, ASTM A533B. It is shown that the fracture criterion of achieving the critical tensile stress over a characteristic microstructural distance is essentially unaffected by neutron irradiation. Thus, it appears that the effects of irradiation on the temperature-dependence of KIc in the cleavage range can be quantitatively assessed solely in terms of the effects on the yield and flow properties of the material.

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.

Electron Irradiation Effects in Polyoxymethylene Crystals Grown Inside Trioxane Crystals

1971 ◽  
Vol 29 ◽  
pp. 78-79
Author(s):  
J. P. Colson ◽  
D. H. Reneker
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Detailed Examination ◽  
The Other ◽  
Electron Micrograph ◽  
Irradiation Effects ◽  
Threefold Axis ◽  
Typical Sample ◽  
Polymer Crystals ◽  
Chain Axis

Polyoxymethylene (POM) crystals grow inside trioxane crystals which have been irradiated and heated to a temperature slightly below their melting point. Figure 1 shows a low magnification electron micrograph of a group of such POM crystals. Detailed examination at higher magnification showed that three distinct types of POM crystals grew in a typical sample. The three types of POM crystals were distinguished by the direction that the polymer chain axis in each crystal made with respect to the threefold axis of the trioxane crystal. These polyoxymethylene crystals were described previously.At low magnifications the three types of polymer crystals appeared as slender rods. One type had a hexagonal cross section and the other two types had rectangular cross sections, that is, they were ribbonlike.

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.

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