Direct observation of dislocations originating from perfect twin boundaries

2011 ◽  
Vol 65 (6) ◽  
pp. 501-504 ◽  
Author(s):  
Jiapeng Sun ◽  
Liang Fang ◽  
Kun Sun ◽  
Jing Han
Keyword(s):  
Direct Observation ◽  
Twin Boundaries

Direct observation of non-collinear vortex structures induced by twin boundaries in YBa2Cu3Oy single crystals

1996 ◽  
Vol 105 (5-6) ◽  
pp. 1105-1110 ◽  
Author(s):  
A. A. Zhukov ◽  
G. K. Perkins ◽  
J. V. Thomas ◽  
A. D. Caplin ◽  
H. K�pfer ◽  
...  
Keyword(s):  
Single Crystals ◽  
Direct Observation ◽  
Vortex Structures ◽  
Twin Boundaries

scholarly journals Direct observation of precipitation along twin boundaries and dissolution in a magnesium alloy annealing at high temperature

2017 ◽  
Vol 138 ◽  
pp. 39-43 ◽  
Author(s):  
Dikai Guan ◽  
John Nutter ◽  
Joanne Sharp ◽  
Junheng Gao ◽  
W. Mark Rainforth
Keyword(s):  
High Temperature ◽  
Magnesium Alloy ◽  
Direct Observation ◽  
Twin Boundaries

Direct observation of tilted vortex structures induced by twin boundaries inYBa2Cu3Oysingle crystals

1997 ◽  
Vol 56 (6) ◽  
pp. 3481-3487 ◽  
Author(s):  
A. A. Zhukov ◽  
G. K. Perkins ◽  
J. V. Thomas ◽  
A. D. Caplin ◽  
H. Küpfer ◽  
...  
Keyword(s):  
Direct Observation ◽  
Vortex Structures ◽  
Twin Boundaries

scholarly journals Direct Observation of One-Dimensional Peierls-type Charge Density Wave in Twin Boundaries of Monolayer MoTe2

ACS Nano ◽  
2020 ◽  
Vol 14 (7) ◽  
pp. 8299-8306 ◽  
Author(s):  
Li Wang ◽  
Ying Wu ◽  
Yayun Yu ◽  
Aixi Chen ◽  
Huifang Li ◽  
...  
Keyword(s):  
Charge Density ◽  
Direct Observation ◽  
Charge Density Wave ◽  
Density Wave ◽  
Twin Boundaries ◽  
One Dimensional

Direct observation of dissipative flux motion and pinning by twin boundaries in YBa_{2}Cu_{3}O_{7-δ} single crystals

1990 ◽  
Vol 64 (8) ◽  
pp. 966-969 ◽  
Author(s):  
W. Kwok ◽  
U. Welp ◽  
G. Crabtree ◽  
K. Vandervoort ◽  
R. Hulscher ◽  
...  
Keyword(s):  
Single Crystals ◽  
Direct Observation ◽  
Twin Boundaries ◽  
Flux Motion

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

Arsenic segregation in polysilicon

1983 ◽  
Vol 41 ◽  
pp. 154-155 ◽  
Author(s):  
P.E. Batson ◽  
C.R.M. Grovenor ◽  
D.A. Smith ◽  
C. Wong
Keyword(s):  
Incident Beam ◽  
Silicon Wafers ◽  
Chemical Polishing ◽  
Bright Field Image ◽  
Beam Size ◽  
Stem Analysis ◽  
Bright Field ◽  
Twin Boundaries ◽  
X Ray ◽  
Line Scan

In this work As doped polysilicon was deposited onto (100) silicon wafers by APCVD at 660°C from a silane-arsine mixture, followed by a ten minute anneal at 1000°C, and in one case a further ten minute anneal at 700°C. Specimens for TEM and STEM analysis were prepared by chemical polishing. The microstructure, which is unchanged by the final 700°C anneal,is shown in Figure 1. It consists of numerous randomly oriented grains many of which contain twins.X-ray analysis was carried out in a VG HB5 STEM. As K α x-ray counts were collected from STEM scans across grain and twin boundaries, Figures 2-4. The incident beam size was about 1.5nm in diameter, and each of the 20 channels in the plots was sampled from a 1.6nm length of the approximately 30nm line scan across the boundary. The bright field image profile along the scanned line was monitored during the analysis to allow correlation between the image and the x-ray signal.

Application of a Simple Cold Stub to the Direct Observation of Frozen Hydrated Sand

1973 ◽  
Vol 31 ◽  
pp. 212-213
Author(s):  
John M. Wehrung ◽  
Richard J. Harniman
Keyword(s):  
United States ◽  
Surface Water ◽  
Direct Observation ◽  
Controlled Study ◽  
Clay Particles ◽  
Organic Debris ◽  
Rock Formations ◽  
Water Tables ◽  
Permeable Rock ◽  
Natural Means

Water tables in aquifer regions of the southwest United States are dropping off at a rate which is greater than can be replaced by natural means. It is estimated that by 1985 wells will run dry in this region unless adequate artificial recharging can be accomplished. Recharging with surface water is limited by the plugging of permeable rock formations underground by clay particles and organic debris.A controlled study was initiated in which sand grains were used as the rock formation and water with known clay concentrations as the recharge media. The plugging mechanism was investigated by direct observation in the SEM of frozen hydrated sand samples from selected depths.

Direct Observation of the Diffusionless β → β + ω Transformation in Titanium Alloys

1971 ◽  
Vol 29 ◽  
pp. 122-123
Author(s):  
N. E. Paton ◽  
D. de Fontaine ◽  
J. C. Williams
Keyword(s):  
Electron Microscope ◽  
Titanium Alloys ◽  
Direct Observation ◽  
Dark Field ◽  
X Ray Diffraction ◽  
Resistivity Measurements ◽  
Selected Area Electron Diffraction ◽  
Ti Alloys ◽  
Thin Foils ◽  
Field Device

The electron microscope has been used to study the diffusionless β → β + ω transformation occurring in certain titanium alloys at low temperatures. Evidence for such a transformation was obtained by Cometto et al by means of x-ray diffraction and resistivity measurements on a Ti-Nb alloy. The present work shows that this type of transformation can occur in several Ti alloys of suitable composition, and some of the details of the transformation are elucidated by means of direct observation in the electron microscope.Thin foils were examined in a Philips EM-300 electron microscope equipped with a uniaxial tilt, liquid nitrogen cooled, cold stage and a high resolution dark field device. Selected area electron diffraction was used to identify the phases present and the ω-phase was imaged in dark field by using a (101)ω reflection. Alloys were water quenched from 950°C, thinned, and mounted between copper grids to minimize temperature gradients in the foil.

Sign in / Sign up

Export Citation Format

Share Document