Low temperature atomic-scale observations of slip traces in niobium

2020 ◽  
Vol 183 ◽  
pp. 81-85 ◽  
Author(s):  
B. Douat ◽  
J. Bonneville ◽  
M. Drouet ◽  
L. Vernisse ◽  
C. Coupeau
Keyword(s):  
Low Temperature ◽  
Atomic Scale ◽  
Slip Traces

Double-tilting specimen holder cooled by liquid helium for JEM-4000EX

1992 ◽  
Vol 50 (2) ◽  
pp. 962-963
Author(s):  
H. Hashimoto ◽  
Y. Yokota ◽  
M. Hashimoto ◽  
E. Sukedai ◽  
H. Endoh ◽  
...  
Keyword(s):  
Low Temperature ◽  
Liquid Helium ◽  
Detection System ◽  
Atomic Scale ◽  
Driving Mechanism ◽  
Pole Piece ◽  
Present Specimen ◽  
Flowing Liquid ◽  
Specimen Holder ◽  
Electron Lens

For the study of phase transformation and structure change of crystals at low temperature in atomic scale, flowing liquid He specimen cooling holder has been constructed. It was aimed to achieve the low temperature without giving any effects to the resolution and analytical function of JEM-4000EX such as X-ray detection system and goniometer functions. The pole piece of electron lens used in this experiment has the following functions, i.e. Cs=2.88mm Cc=2.69mm f=3.55mm and the resolution is 0.34nm. The present specimen stage can be tilted ±20 degrees to X- and Y-directions inside of this pole piece. In connection of double tilt mechanism and protection of heat loss, double layered bellows are fabricated at the entrance of driving mechanism. At this point every vibrations from outside of the microscope such as from pumping out system of introduced liquid helium (the pipe A in Fig. 1) would be extinguished. This mechanism is fabricated in the vacuum box (marked by B in Fig.1).

scholarly journals Pure hydrogen low-temperature plasma exposure of HOPG and graphene: Graphane formation?

2012 ◽  
Vol 3 ◽  
pp. 852-859 ◽  
Author(s):  
Baran Eren ◽  
Dorothée Hug ◽  
Laurent Marot ◽  
Rémy Pawlak ◽  
Marcin Kisiel ◽  
...  
Keyword(s):  
Low Temperature ◽  
Scanning Probe Microscopy ◽  
Atomic Scale ◽  
Scanning Probe ◽  
Scanning Tunneling ◽  
Multilayer Graphene ◽  
Pure Hydrogen ◽  
Low Temperature Plasma ◽  
Temperature Plasma ◽  
Probe Microscopy

Single- and multilayer graphene and highly ordered pyrolytic graphite (HOPG) were exposed to a pure hydrogen low-temperature plasma (LTP). Characterizations include various experimental techniques such as photoelectron spectroscopy, Raman spectroscopy and scanning probe microscopy. Our photoemission measurement shows that hydrogen LTP exposed HOPG has a diamond-like valence-band structure, which suggests double-sided hydrogenation. With the scanning tunneling microscopy technique, various atomic-scale charge-density patterns were observed, which may be associated with different C–H conformers. Hydrogen-LTP-exposed graphene on SiO2 has a Raman spectrum in which the D peak to G peak ratio is over 4, associated with hydrogenation on both sides. A very low defect density was observed in the scanning probe microscopy measurements, which enables a reverse transformation to graphene. Hydrogen-LTP-exposed HOPG possesses a high thermal stability, and therefore, this transformation requires annealing at over 1000 °C.

scholarly journals Atomic-scale study of low-temperature equilibria in iron-rich Al-C-Fe

2008 ◽  
Vol 78 (1) ◽  
Author(s):  
Rémy Besson ◽  
Alexandre Legris ◽  
Damien Connetable ◽  
Philippe Maugis
Keyword(s):  
Low Temperature ◽  
Atomic Scale

An atomic-scale insight into Ni3Al slip traces

Materialia ◽  
2020 ◽  
Vol 9 ◽  
pp. 100563
Author(s):  
C. Coupeau ◽  
J. Michel ◽  
J. Bonneville ◽  
M. Drouet
Keyword(s):  
Atomic Scale ◽  
Slip Traces ◽  
Insight Into

Atomic-Scale Design for Enhanced Low Temperature Twinning in ZrCr2-Based Laves Phases

1999 ◽  
Vol 578 ◽  
Author(s):  
W.-Y. Kim ◽  
D.E. Luzzi
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Alloy System ◽  
Deformation Mode ◽  
Systematic Investigation ◽  
Mechanical Twinning ◽  
Atomic Scale ◽  
Laves Phases ◽  
Drastic Effect ◽  
Scale Design

AbstractRecently, we have designed and produced several transition metal Laves phases with low-temperature compressive ductility. These improved alloys demonstrate that manipulation of atomic-scale structure can have a drastic effect on meso-scale deformation behavior. To gain a basic understanding of the role of atomic-scale substitutions on the room temperature mechanical properties, a systematic investigation of the Laves ZrCr2-based alloy system alloyed with Hf, Nb, Ta and Ti was conducted and is reported here. Extensive room temperature ductility was obtained in the Hf-alloyed ternary Laves phase alloy system. Mechanical twinning is found to be the predominant deformation mode at room temperature in this alloy system. It is emphasized that Hf substitution in the Zr sublattice of ZrCr2 may play the most prominent role in changing the local electronic structure resulting in easier twinning.

STM/STS STUDY ON LOCAL ELECTRONIC STATES OF UNDERDOPED Bi2Sr2CaCu2O8+δ

2005 ◽  
Vol 19 (01n03) ◽  
pp. 231-234 ◽  
Author(s):  
N. MOMONO ◽  
A. HASHIMOTO ◽  
Y. KOBATAKE ◽  
S. NAKAMURA ◽  
M. ODA ◽  
...  
Keyword(s):  
Low Temperature ◽  
Spatial Variation ◽  
Electronic States ◽  
Atomic Scale ◽  
Gap Size ◽  
Tunneling Spectrum ◽  
Underdoped Sample ◽  
D Wave

Spatial variation of low temperature tunneling spectrum on atomic scale was examined on the slightly underdoped Bi 2212 sample (Tc~74 K , p~0.12) by using a STM/STS technique. We observed a V-shaped gap with sharp coherence peaks, which is expected for d-wave superconductors, over the distance of ~18 nm and no other kind of gap. The spatial variation of gap size Δ0 is small, ranging from 41 to 53 meV . These results indicate that the superconductivity takes place rather homogeneously in the slightly underdoped sample.

Atomic scale characterization of GaInN/GaN layers grown on sapphire substrates with low-temperature deposited AlN buffer layers

2002 ◽  
Vol 237-239 ◽  
pp. 1133-1138 ◽  
Author(s):  
M. Tabuchi ◽  
H. Kyouzu ◽  
Y. Takeda ◽  
S. Yamaguchi ◽  
H. Amano ◽  
...  
Keyword(s):  
Low Temperature ◽  
Atomic Scale ◽  
Buffer Layers ◽  
Sapphire Substrates ◽  
Scale Characterization ◽  
Aln Buffer
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