Defects in Crystalline Solids Vol 11 – Electronic and Vibrational Properties of Point Defects in Ionic Crystals

1980 ◽  
Vol 31 (9) ◽  
pp. 320-320
Author(s):  
A E Hughes
Keyword(s):  
Point Defects ◽  
Vibrational Properties ◽  
Ionic Crystals ◽  
Crystalline Solids

Contrast From Point Defects in The Infinitesimal Approximation

1980 ◽  
Vol 38 ◽  
pp. 350-351
Author(s):  
L. J. Sykes ◽  
J. J. Hren
Keyword(s):  
Electron Microscope ◽  
Point Defects ◽  
Broad Class ◽  
Stacking Fault ◽  
Crystalline Solids ◽  
Dislocation Loops ◽  
Analytical Expression ◽  
Stacking Fault Tetrahedra

In electron microscope studies of crystalline solids there is a broad class of very small objects which are imaged primarily by strain contrast. Typical examples include: dislocation loops, precipitates, stacking fault tetrahedra and voids. Such objects are very difficult to identify and measure because of the sensitivity of their image to a host of variables and a similarity in their images. A number of attempts have been made to publish contrast rules to help the microscopist sort out certain subclasses of such defects. For example, Ashby and Brown (1963) described semi-quantitative rules to understand small precipitates. Eyre et al. (1979) published a catalog of images for BCC dislocation loops. Katerbau (1976) described an analytical expression to help understand contrast from small defects. There are other publications as well.

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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