DISLOCATIONSATOMISTIC CALCULATIONS ON EDGE DISLOCATIONS, POINT DEFECTS, AND INTERACTIONS BETWEEN THEM IN IONIC CRYSTALS

1976 ◽  
Vol 37 (C7) ◽  
pp. C7-549-C7-549 ◽  
Author(s):  
F. GRANZER ◽  
V. BELZNER ◽  
H. POTSTADA
Keyword(s):  
Point Defects ◽  
Ionic Crystals ◽  
Edge Dislocations

Modelling of Recrystallization Nucleation at Hard Inclusions

2012 ◽  
Vol 715-716 ◽  
pp. 593-598
Author(s):  
Werner Mitter ◽  
Christof Sommitsch
Keyword(s):  
Plastic Deformation ◽  
Dislocation Density ◽  
Point Defects ◽  
Strain Energy ◽  
Metallic Structure ◽  
Pile Up ◽  
High Gradients ◽  
Diffusional Flow ◽  
Edge Dislocations

During plastic deformation, a metallic structure is deformed inhomogeneously near hard inclusions. Hence both the materials strengthening and recovery and thus softening depends on the local position. There are thus high gradients of point defects, such as vacancies and interstitials, of the dislocation density and hence of the strain energy. Those gradients govern the diffusional flow, whose pile-up influences the climbing of edge dislocations, i.e. recovery and materials softening, respectively.

Investigations of Microwave Absorption in Insulating Dielectric Ionic Crystals Including the Role of Point Defects and Dislocations

1996 ◽  
Vol 430 ◽  
Author(s):  
Benjamin D.B. Klein ◽  
Binshen Meng ◽  
Samuel A. Freeman ◽  
John H. Booske ◽  
Reid F. Cooper
Keyword(s):  
Theoretical Model ◽  
Single Crystal ◽  
Microwave Absorption ◽  
Point Defects ◽  
Ionic Conduction ◽  
Cavity Resonator ◽  
Preparation Technique ◽  
Ionic Crystals ◽  
Free Case

AbstractA theoretical model of microwave absorption in linear dielectric (non-ferroelectric) ionic crystals that takes into account the presence of point defects was synthesized and verified using NaCl single crystals. In the next stage of this research, we will introduce a controlled density of dislocations into the single crystal NaCl samples and study the effect on the microwave absorption mechanisms (ionic conduction, dielectric relaxation and multi-phonon processes) both theoretically and experimentally. Qualitative outlines of this modified theory are presented. The loss factor ε’ has been measured in the dislocation-free case by a cavity resonator insertion technique and the experimental results are in good agreement with the theoretical model. We describe the sample preparation technique that will be used to produce a controlled dislocation density in single crystal samples that will also be studied in our cavity resonator insertion system.

scholarly journals Maxwell-Boltzmann periodic structures by point defects in ionic crystals

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-496-C6-499
Author(s):  
M. Georgiev ◽  
N. Martinov ◽  
D. Ouroushev
Keyword(s):  
Point Defects ◽  
Periodic Structures ◽  
Ionic Crystals
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