scholarly journals SHAPE OF GRAIN BOUNDARY GROOVE ONPURE ICE SURFACE

Anales AFA ◽  
2021 ◽  
Vol 31 (4) ◽  
pp. 112-116
Author(s):  
C.L. Di Prinzio ◽  
◽  
D. Stoler ◽  
P.I. Achával ◽  
G. Aguirre Varela ◽  
...  
Keyword(s):  
Free Surface ◽  
Grain Boundary ◽  
Surface Diffusion ◽  
Boundary Groove ◽  
Gaseous Diffusion ◽  
Dry Air ◽  
Ice Surface ◽  
Regular Time ◽  
Matter Transport ◽  
Time Periods

In this work we studied the evolution of the groove that forms the grain boundary (BG) when it emerges to a free surface, in the presence of different processes of matter transport. By using a confocal microscope, the shape of the grain edge groove was obtained in an ice sample with orientation <1010>/50◦at −5◦C ; after keeping it 3 h in an environment with dry air. The shapes and depths of the grain boundary groove obtained experimentally, at regular time periods, were satisfactorily fitted considering a process of transport of matter developed by Srinivasan and Trivedi. In this model the transport of matter is mainly ruled by gaseous diffusion and not by surface diffusion.

scholarly journals SHAPE OF GRAIN BOUNDARY GROOVE ONPURE ICE SURFACE

Anales AFA ◽  
2021 ◽  
Vol 31 (4) ◽  
pp. 112-116
Author(s):  
C. L. Di Prinzio ◽  
◽  
D. Stoler ◽  
P. I. Achával ◽  
G. Aguirre Varela ◽  
...  
Keyword(s):  
Free Surface ◽  
Grain Boundary ◽  
Surface Diffusion ◽  
Boundary Groove ◽  
Gaseous Diffusion ◽  
Dry Air ◽  
Ice Surface ◽  
Regular Time ◽  
Matter Transport ◽  
Time Periods

In this work we studied the evolution of the groove that forms the grain boundary (BG) when it emerges to a free surface, in the presence of different processes of matter transport. By using a confocal microscope, the shape of the grain edge groove was obtained in an ice sample with orientation< 1010 >/50◦ at −5◦C ; after keeping it 3 h in an environment with dry air. The shapes and depths of the grain boundary groove obtained experimentally, at regular time periods, were satisfactorily fitted considering a process of transport of matter developed by Srinivasan and Trivedi. In this model the transport of matter is mainly ruled by gaseous diffusion and not by surface diffusion.

scholarly journals ESTUDIO DE LA EVOLUCIÓN SUPERFICIAL DE UN BORDE DE GRANO EN HIELO PURO POR PROCESOS EVAPO-DIFUSIVOS

Anales AFA ◽  
2019 ◽  
pp. 10-14
Author(s):  
M. Lado ◽  
D. Stoler ◽  
G. Aguirre Varela ◽  
C.L. Di Prinzio
Keyword(s):  
Free Surface ◽  
Grain Boundary ◽  
Confocal Microscope ◽  
Experimental Results ◽  
Gaseous Diffusion ◽  
Dry Air ◽  
Matter Transport

In this work, we studied the evolution of the groove that forms the grain boundary (BG)when it emerges to a free surface, in the presence of different processes of matter transport. The depth of a groove of the BG was obtained in an ice sample with orientation <1010>/50º at -5 ºC for 3h in dry air, by using a confocal microscope. The experimental results are fitted correctly with a process of transport of matter governed mainly by gaseous diffusion.

Grain boundary grooving by surface diffusion in SrTiO3 bicrystal

1999 ◽  
Vol 14 (6) ◽  
pp. 2548-2553 ◽  
Author(s):  
Minxian Jin ◽  
Eriko Shimada ◽  
Yasuro Ikuma
Keyword(s):  
Diffusion Coefficient ◽  
Grain Boundary ◽  
Surface Diffusion ◽  
Diffusion Coefficients ◽  
Present Experiment ◽  
Titanium Atom ◽  
Boundary Groove ◽  
Surface Diffusion Coefficient ◽  
Atomic Force ◽  
Different Temperatures

High-purity SrTiO3 bicrystal sample (the angle between two [001] directions is 24°) was used in the present experiment to develop a thermal grain boundary groove along the bicrystal grain boundary at different temperatures (1150–1400 °C) and times (15–6720 min) in air. An atomic force microscope (AFM) was used to observe the surface morphological change in the annealed bicrystal sample in order to measure the width W and depth h of the developed grain boundary groove. It was found that the log W–log t (at 1150–1400 °C) and the log h°log t (at 1400 °C) relationships are approximately linear, having slopes of approximately 1/4. Using Mullins' formulas, the surface diffusion coefficients of SrTiO3 at different temperatures were calculated. Finally, the surface diffusion coefficient determined in the present experiment appears to correspond to the titanium atom, which has the lowest diffusivity in SrTiO3.

Grain boundary grooving by surface diffusion: an analytic nonlinear model for a symmetric groove

1995 ◽  
Vol 450 (1940) ◽  
pp. 569-587 ◽  
Keyword(s):  
Grain Boundary ◽  
Surface Diffusion ◽  
Nonlinear Evolution Equation ◽  
Nonlinear Boundary ◽  
Nonlinear Evolution ◽  
Surface Profile ◽  
Boundary Groove ◽  
Constant Slope ◽  
Limiting Case ◽  
Integrable Nonlinear Evolution Equation

The fourth-order nonlinear boundary-value problem for the evolution of a single symmetric grain-boundary groove by surface diffusion is modelled analytically. A solution is achieved by partitioning the surface into subintervals delimited by lines of constant slope. Within each subinterval, the advance of the surface is described by an integrable nonlinear evolution equation. The model is capable of incorporating the actual nonlinearity arbitrarily closely. The surface profile is determined for various values of the central groove slope including the limiting case of a groove which has a root that is vertical. Such a solution exists only because of the nonlinearity.

scholarly journals Superficial self-diffusion coefficient in Ih-ICE

2020 ◽  
Vol 10 (2) ◽  
pp. 153-160
Author(s):  
Carlos Leonardo Di Prinzio ◽  
Damian Stoler ◽  
Guillermo Aguirre Varela ◽  
Esteban Druetta
Keyword(s):  
Diffusion Coefficient ◽  
Free Surface ◽  
Grain Boundary ◽  
Silicone Oil ◽  
Optical Microscope ◽  
Boundary Groove ◽  
Self Diffusion ◽  
Self Diffusion Coefficient

The evolution of the grain boundary groove in a bicrystalline ice sample was studied in this work. The groove is formed by the intersection of the grain boundary with the free surface. The bicrystalline ice sample had an arbitrary misorientation and was immersed in ultra-pure silicone oil at -5°C in order to avoid evaporation processes. Photographs of the groove were taken every 17 minutes for 100 hours with an optical microscope and the evolution of the groove was determined from these images. Through this study, it was possible to measure the coefficient of surface self-diffusion of the ice at -5°C.

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

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