Phase diagram of grain boundary facet and line junctions in silicon

AbstractWe investigated the phase formation sequence in the reaction of multilayer thin films of Nb/Al with overall compositions of 25 and 33 at.% AI. We report novel phenomena which distinguish thin-film reactions unequivocally from those in bulk systems. For sufficiently thin layers composition and stability of product phases are found to deviate significantly from that predicted from the equilibrium phase diagram. We demonstrate that in the Nb/Al system the length scales below which such deviations occur is about 150 nm. We believe that these phenomena occur due to the importance of grain boundary diffusion and hence microstructure in these thin films.

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The Grain Boundary Wetting in the Sn– 25 at% In Alloys

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.258-260.491 ◽

2006 ◽

Vol 258-260 ◽

pp. 491-496 ◽

Cited By ~ 3

Author(s):

C.H. Yeh ◽

L.S. Chang ◽

Boris B. Straumal

Keyword(s):

Phase Transition ◽

Phase Diagram ◽

Grain Boundary ◽

Annealing Temperature ◽

Bulk Phase ◽

Bulk Phase Diagram ◽

Tie Lines ◽

Grain Boundary Wetting ◽

Increasing Temperature

The grain boundary (GB) wetting was investigated in the Sn – 25 at.% In alloy. It was found that the portion of GBs wetted by the melt depends on the annealing temperature. No GB completely wetted by melt was observed at 140°C, while all GBs were fully wetted after annealing at 180°C. Between 140°C and 180°C the portion of wetted GBs increases with increasing temperature. The tie-lines of GB wetting phase transition were constructed in the Sn–In bulk phase diagram.

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Concentration Dependence of Grain Boundary Diffusion

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.369.1 ◽

2016 ◽

Vol 369 ◽

pp. 1-5

Author(s):

Alexey O. Rodin ◽

Nikolai Dolgopolov ◽

Alexander Pomadchik

Keyword(s):

Experimental Data ◽

Phase Diagram ◽

Grain Boundary ◽

Concentration Dependence ◽

Boundary Diffusion ◽

Solidus Temperature ◽

Structural Effect ◽

Grain Boundary Diffusion ◽

P Value ◽

Zn Diffusion

According to different experimental data the grain boundary diffusion the triple product (P) can change in opposite directions after alloying. In this paper the analysis of the effect of alloying for different systems is proposed. It was shown that in Al-based system (Cu diffusion in Al, Zn diffusion in Al) the P value increases with alloying while the solidus temperature according to the phase diagram decreases, in other systems no such tendency can be seen. Estimations based on the segregation factor value demonstrate that some structural effect must be proposed in addition to describe the experimental results.

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Phase Diagram Involving the Twist Grain Boundary Phase in the Vicinity of a Virtual Cholesteric-Smectic A-Smectic C*Point

Molecular Crystals and Liquid Crystals Science and Technology Section A Molecular Crystals and Liquid Crystals ◽

10.1080/10587259408028209 ◽

1994 ◽

Vol 250 (1) ◽

pp. 239-245 ◽

Cited By ~ 7

Author(s):

S. K. Prasad ◽

V. N. Raja ◽

G. G. Nair ◽

J. W. Goodby

Keyword(s):

Phase Diagram ◽

Grain Boundary ◽

Boundary Phase ◽

Smectic A ◽

Smectic C

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Phase Diagram of the Electron-DopedLa2−xCexCuO4Cuprate Superconductor from Andreev Bound States at Grain Boundary Junctions

Physical Review Letters ◽

10.1103/physrevlett.100.227001 ◽

2008 ◽

Vol 100 (22) ◽

Cited By ~ 11

Author(s):

M. Wagenknecht ◽

D. Koelle ◽

R. Kleiner ◽

S. Graser ◽

N. Schopohl ◽

...

Keyword(s):

Phase Diagram ◽

Grain Boundary ◽

Bound States ◽

Andreev Bound States

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Motion of a grain boundary facet in aluminum

Acta Materialia ◽

10.1016/j.actamat.2013.05.043 ◽

2013 ◽

Vol 61 (14) ◽

pp. 5518-5524 ◽

Cited By ~ 6

Author(s):

J.-E. Brandenburg ◽

L.A. Barrales-Mora ◽

D.A. Molodov ◽

G. Gottstein

Keyword(s):

Grain Boundary ◽

Boundary Facet

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Structure of Historical Brass Tongues and Shallots from Baroque Organs

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.249.275 ◽

2006 ◽

Vol 249 ◽

pp. 275-280 ◽

Cited By ~ 9

Author(s):

B. Baretzky ◽

M. Friesel ◽

A. Petelin ◽

A.A. Mazilkin ◽

Boris B. Straumal

Keyword(s):

Phase Diagram ◽

Solid Solution ◽

Grain Size ◽

Grain Boundary ◽

Annealing Temperature ◽

Coincidence Site Lattice ◽

Site Lattice ◽

Two Samples ◽

Baroque Era

The composition and microstructure of historic tongues and shallots from reed pipes of various Baroque organs has been studied. They contain Cu-Zn solid solution (α-brass with 23-29 wt. % Zn) and lead particles. Lead is mainly present as spherical bulk or lens-like grain boundary (GB) inclusions. However, in two samples Pb wets the brass GBs. In this case Pb forms the branched root-like structures. Grain size in brass scatters from 10 to 200 µm. Around 50% of all GBs in brass are Σ=3 twin GBs. The high-indexed coincidence site lattice facets were observed in twin GBs. The increase of number of various facets roughly correlates with decreasing grain size. It may indicate the variation in annealing temperature used by organbuilders in Baroque Era. The annealing temperature has been estimated using the faceting phase diagram for twin GBs in Cu.

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Direct imaging of segregation layers in Bi-doped Cu grain boundaries

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100174722 ◽

1990 ◽

Vol 48 (4) ◽

pp. 318-319

Author(s):

D.E. Luzzi

Keyword(s):

Grain Boundary ◽

Grain Boundaries ◽

Detailed Analysis ◽

Internal Structure ◽

Direct Imaging ◽

Boundary Facet ◽

Macroscopic Orientation

Upon aging of a quenched-in super-saturated alloy at lower temperatures, the Bi segregates to the grain boundaries and ebritt1ement and faceting occur. Recent data suggest that the distribution of facet orientations for Σ = 3 misorientation grains evolves with aging at 600 C with a preference for the eventual formation of (-111)|(1-11) facets. Whereas the concentration of Bi on the facets and the macroscopic orientation of the facets has been established, little is known about the structure of these facets on the atomistic scale. In this abstract, the summarized results from a detailed analysis of the internal structure of a Σ = 3 (-111)|(1-11) grain boundary facet is presented and contrasted with the structure of a Σ = 3 (111) twin.

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