Direct evidence for grain-boundary depletion in polycrystalline CdTe from nanoscale-resolved measurements

2003 ◽  
Vol 82 (4) ◽  
pp. 556-558 ◽  
Author(s):  
Iris Visoly-Fisher ◽  
Sidney R. Cohen ◽  
David Cahen
Keyword(s):  
Grain Boundary ◽  
Direct Evidence

X-Ray Reflectivity Study of Single- and Bicrystals of Gold

1990 ◽  
Vol 208 ◽  
Author(s):  
M. R. Fitzsimmons ◽  
E. Burkel ◽  
J. Peisl
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Diffuse Scattering ◽  
Direct Evidence ◽  
X Ray ◽  
Specular Reflectivity ◽  
Boundary Measurements

ABSTRACTX-ray reflectivity techniques have been used to characterize the surfaces of 0.4µm thick Au films epitaxially grown on single-crystals of NaCl. Measurements of both the specular and non-specular reflectivity suggest that the Au surface is very rough. The nonspecular reflectivity provides valuable information about the correlation of the heights at different points on the surface. The first in situ reflectivity study of the formation and destruction of a grain boundary shows direct evidence for the existence of diffuse scattering from the grain boundary. Measurements of several [0011 twist grain boundaries suggest that the roughness and texture of an interface depends upon the geometrical orientation of the surrounding substrates.

Evolution of Grain Boundary Texture in Zirconium Alloys

2011 ◽  
Vol 702-703 ◽  
pp. 710-713
Author(s):  
Karri V. Mani Krishna ◽  
Sudipto Mandal ◽  
Ankur Agrawal ◽  
Vijay Hiwarkar ◽  
Dinesh Srivastava ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Grain Boundary ◽  
Annealing Time ◽  
Considerable Increase ◽  
Direct Evidence ◽  
Texture Evolution ◽  
Zirconium Alloys ◽  
Alpha Phase ◽  
Variant Selection ◽  
Alpha Beta

Grain boundary texture evolution in case of two of the Zr based alloys (Zircaloy-4 and Zr-2.5\%Nb) was studied. In case of Zircaloy-4, grain boundary texture evolution during $\beta$ $\to$ $\alpha$ phase transformation was monitored. Direct evidence of variant selection during this transformation is presented. In case of Zr-2.5\%Nb alloy, considerable increase in $\alpha/\beta$ interfaces following Burger's orientation relationship was noticed with increasing annealing time at 700 \textdegree{}C.

Cluster ‘Contact Epitaxy’- Direct Evidence for Novel Particle: Substrate Interactions

1999 ◽  
Vol 570 ◽  
Author(s):  
M. Yeadon ◽  
J.C. Yang ◽  
M. Ghaly ◽  
R.S. Averback ◽  
J.M. Gibson
Keyword(s):  
Molecular Dynamics ◽  
Melting Point ◽  
Grain Boundary ◽  
Ag Nanoparticles ◽  
Direct Evidence ◽  
Low Energy ◽  
Novel Interactions ◽  
Ag Cluster ◽  
Dynamics Simulations ◽  
Ordered Layers

ABSTRACTIn this paper we describe observations of novel interactions between clusters of Ag deposited on the clean (001) Cu surface. The experiments are analogous to those performed by Gleiter and co-workers in the 1970's, where grain boundary orientations in particles of Cu and Ag supported on single crystal metal substrates were studied. Upon annealing close to the melting point, these particles (∼10–100μm in diameter) were found to rotate on the surface, forming low-energy grain boundary configurations with the substrate. The particles studied in our experiments are ∼104 times smaller, and show rather different behavior. In the case of Ag nanoparticles we have observed a novel phenomenon, which we call ‘contact epitaxy’, involving the formation of several monolayers of epitaxially oriented Ag at the Cu surface upon contact between this surface and the Ag cluster. The phenomenon may be understood from molecular dynamics simulations of the ‘soft impact’ between the nanoparticle and surface, which indicate that the ordered layers form within picoseconds of contact. We will discuss the mechanisms by which ‘contact epitaxy’ is believed to occur.

Direct Evidence of Dopant-Enhanced Grain-Boundary Sliding in Yttria-Stabilized Zirconia Bicrystals

2005 ◽  
Vol 88 (4) ◽  
pp. 938-942 ◽  
Author(s):  
Atsutomo Nakamura ◽  
Naoya Shibata ◽  
Nobusato Morishige ◽  
Katsuyuki Matsunaga ◽  
Yuichi Ikuhara ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Direct Evidence ◽  
Grain Boundary Sliding ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Boundary Sliding

Direct Evidence of Nanometric Invasionlike Grain Boundary Penetration in theAl/GaSystem

2005 ◽  
Vol 95 (21) ◽  
Author(s):  
E. Pereiro-López ◽  
W. Ludwig ◽  
D. Bellet ◽  
P. Cloetens ◽  
C. Lemaignan
Keyword(s):  
Grain Boundary ◽  
Direct Evidence ◽  
Boundary Penetration

scholarly journals Direct evidence for grain boundary passivation in Cu(In,Ga)Se2 solar cells through alkali-fluoride post-deposition treatments

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Nicoleta Nicoara ◽  
Roby Manaligod ◽  
Philip Jackson ◽  
Dimitrios Hariskos ◽  
Wolfram Witte ◽  
...  
Keyword(s):  
Solar Cells ◽  
Grain Boundary ◽  
Direct Evidence ◽  
Post Deposition

A Mechanism for Particle Coalescence, Grain Growth and Twin Formation During Annealing of Gold Particles in an Amorphous Silica Matrix

1983 ◽  
Vol 21 ◽  
Author(s):  
J. McGinn ◽  
V.A. Greenhut ◽  
T. Tsakalakos
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Amorphous Silica ◽  
Direct Evidence ◽  
Boundary Migration ◽  
Silica Matrix ◽  
Grain Boundary Migration ◽  
High Angle ◽  
Gold Particles ◽  
Particle Coalescence

ABSTRACTDirect evidence was obtained for the coalescence of discrete gold particles (∼;lO0 nm) surrounded by a continuous amorphous silica matrix during annealing at 900°C. The particles were found to form high angle boundaries as coalescence occurred. Subsequent annealing revealed that grain growth occurred with relatively rapid elimination of high angle grain boundaries. The coalesced particles became approximately spherical in shape and seven particle morphologies could be distinguished. A majority of particles showed either no defect structure or conventional f.c.c. twins. In more limited cases, a small area of high angle grain boundary, usually of coincidence lattice type, was observed which accommodated intersecting twins. A single self-consistent mechanism can explain the elimination of high angle boundaries and all the various twin structures observed. The mechanism is based on Gleiter's [l] model for grain boundary migration with twin structures resulting from growth accidents on the migrating high angle boundary.

Direct Evidence for Negative Grain Boundary Potential in Ca-Doped and UndopedYBa2Cu3O7−x

2004 ◽  
Vol 92 (19) ◽  
Author(s):  
Marvin A. Schofield ◽  
Marco Beleggia ◽  
Yimei Zhu ◽  
Karsten Guth ◽  
Christian Jooss
Keyword(s):  
Grain Boundary ◽  
Direct Evidence ◽  
Boundary Potential
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