Determination of Crystallite and Block Sizes, of Microstresses, and of Lattice Distortion

1964 ◽  
pp. 577-635
Author(s):  
Lev Iosifovich Mirkin
Keyword(s):  
Lattice Distortion ◽  
Block Sizes

Dislocations in Crystals

1968 ◽  
Vol 26 ◽  
pp. 248-249
Author(s):  
Roy H. Geiss
Keyword(s):  
Quantitative Data ◽  
Lattice Distortion ◽  
Materials Science ◽  
Heat Treating ◽  
Diffraction Vector ◽  
Strengthening Phase ◽  
Dynamical Equations ◽  
Transmission Electron ◽  
Factor Α

Transmission electron microscopy is being utilized today in the study of many important problems in materials science and metallurgy. Such areas of research include annealing and heat treating, strengthening, phase transformations and crystal growth. In many of these studies it is important to assemble quantitative data on the dislocation structures existing in the material. These data might include the determination of Burgers vectors ḇ, glide planes and densities of the various dislocations. The purpose of this paper is to review briefly a few of the fundamentals used in obtaining such data.The contrast from a dislocation arises from the extra phase factor α=2πg · Ṟ found in the dynamical equations of electron diffraction, where g is the diffraction vector and Ṟ a vector describing the lattice distortion. For a screw dislocation Ṟ is proportional to ḇ and similarly near the glide plane of an edge dislocation.

Evidence of strong indium segregation in MOCVD InxGa1-xN/GaN quantum layers

2003 ◽  
Vol 798 ◽  
Author(s):  
Grzegorz Maciejewski ◽  
Grzegorz Jurczak ◽  
Sławomir Kret ◽  
Paweł Dłużewski ◽  
Pierre Ruterana
Keyword(s):  
Lattice Distortion ◽  
Fem Simulation ◽  
Thin Foil ◽  
Indium Content ◽  
Image Simulation ◽  
The Finite Element Method ◽  
3D Fem ◽  
Rich Cluster ◽  
Transmission Electron

ABSTRACTAn investigation of 1–5 nm in diameter indium rich clusters in MOCVD InxGa1-xN/GaN quantum well is carried out. To this end, quantitative High Resolution Transmission Electron Microscopy (HRTEM) is coupled with the Finite Element Method (FEM) for the calculation of thin foil relaxation and for image simulation. The measurement of the tetragonal distortion from HRTEM images is a useful tool for the determination of chemical composition in heterostructures. However, for a correct interpretation of the measured lattice distortion on HRTEM images, one needs to take into account the strain averaging across TEM sample and inhomogeneous relaxation of the sample. As a first step, 3D FEM simulation of the relaxation process as a function of the position of indium rich cluster relative to the foil surface is performed. Next, the calculated 3D displacement field is used to simulate the HRTEM images. The results clearly show that the magnitude of the strain field depends on the cluster position. It is concluded that the HRTEM images of indium rich clusters can differ even for the same indium content due to different positions of the clusters.

Determination of the range of lattice distortion in AIN sintered body by higher order laue zone pattern

1996 ◽  
Vol 31 (10) ◽  
pp. 2693-2696
Author(s):  
S. Nakahata ◽  
T. Matsuura ◽  
K. Sogabe ◽  
A. Yamakawa
Keyword(s):  
Lattice Distortion ◽  
Higher Order ◽  
Sintered Body ◽  
Zone Pattern

Determination of Lattice Distortion in (GaAs)28(AlAs)24Superlattice Layers by X-Ray Diffraction

1986 ◽  
Vol 25 (Part 1, No. 12) ◽  
pp. 1834-1841 ◽  
Author(s):  
Yasuharu Kashihara ◽  
Tomohiro Kase ◽  
Jimpei Harada
Keyword(s):  
Lattice Distortion ◽  
X Ray Diffraction ◽  
X Ray

Determination of Gradient-Elastic Constants in Cubic Solids

1972 ◽  
Vol 27 (8-9) ◽  
pp. 1235-1239 ◽  
Author(s):  
H. J. Hackeloer ◽  
O. Kanert
Keyword(s):  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Point Defects ◽  
Elastic Constants ◽  
Lattice Distortion ◽  
Elastic Stress ◽  
Order Of Magnitude ◽  
The Given

Abstract The effect of static elastic stress on the NMR signal in LiCl35 , Rb85Cl35 , and Rb87Br is used to determine the gradient elastic constants relating the electric field gradient at the given nucleus to the elastic deformation. In contrast to previous experiments the quadrupole distortion produced by internal lattice distortion (point defects, dislocations etc.) is considered. Neglecting these distortions leads to an error in the determination of the gradient elastic constants by an order of magnitude.

Scale Inhibitors Used in Cooling System and the Determination of their Dispersing Power

2012 ◽  
Vol 170-173 ◽  
pp. 2718-2722
Author(s):  
Xiao Lu Qi ◽  
Guan Hua Yue ◽  
Jing Shen
Keyword(s):  
Calcium Carbonate ◽  
Lattice Distortion ◽  
Cooling System ◽  
Scale Formation ◽  
Experimental Basis ◽  
Key Technologies ◽  
Effective Technology

One of the key technologies in recycling cooling system is controlling scale formation, practices have shown that the chemical antisacle method of using inhibitors is the most economic and effective technology. Inhibitors can antisacle by their properties of complexation, lattice distortion and dispersity. In this paper, an easy and effective method of calcium carbonate powder to test their dispersing power is put forward. And by this, the dispersing power of 7 low molecular inhibitors and 9 polymer inhibitors have been determined and ordered, this will provide a significant experimental basis for screening inhibitors.

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