Metastable Phase Formation in Laser Processed Al-Ge Thin Films

1986 ◽  
Vol 74 ◽  
Author(s):  
F. Catalina ◽  
C. N. Afonso ◽  
C. Ortiz
Keyword(s):  
Thin Films ◽  
Laser Pulse ◽  
Comparative Study ◽  
Laser Irradiation ◽  
Eutectic Composition ◽  
Metastable Phase ◽  
Pulse Length ◽  
Free Standing ◽  
Metastable Phase Formation ◽  
Laser Pulse Length

AbstractThis paper presents a comparative study of the microstructures formed in Al.59Ge.41and Al.70Ge.30 (eutectic composition) free standing films under laser irradiation. An hexagonal metastable phase located between Allamella, can be formed depending on the film composition and the laser pulse length.

Laser Pulse Triggering of the Explosive Crystallization in Amorphous Si and Ge Thin Films

1989 ◽  
Vol 157 ◽  
Author(s):  
W. Marine ◽  
J. Marfaing
Keyword(s):  
Thin Films ◽  
Melting Point ◽  
Laser Pulse ◽  
Pulse Length ◽  
Electronic Microscopy ◽  
Explosive Crystallization ◽  
Amorphous Si ◽  
Laser Pulse Length ◽  
Electronic Microscope

ABSTRACTThe structure and morphologies of the thin amorphous a-Si and oc-Ge films crystallized “in situ” in an electronic microscope by pulsed YAG laser have been studied using conventional and high-resolution transmission electronic microscopy observations. It is found that the laser induced nucleation rate (I) is laser pulse length dependent. I is about 1021-1022 cm−3 s−1 (α-Si) and 1023-1025 cm−3 s−1 (α-Ge) near the melting point. Explosive dendritic formation is the result of competition between solid state light induced nucleation and melting mediated explosive growth.

scholarly journals Modeling of metastable phase formation diagrams for sputtered thin films

2016 ◽  
Vol 17 (1) ◽  
pp. 210-219 ◽  
Author(s):  
Keke Chang ◽  
Denis Music ◽  
Moritz to Baben ◽  
Dennis Lange ◽  
Hamid Bolvardi ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Formation ◽  
Metastable Phase ◽  
Metastable Phase Formation

Metastable phase formation in titanium‐silicon thin films

1985 ◽  
Vol 57 (12) ◽  
pp. 5240-5245 ◽  
Author(s):  
Robert Beyers ◽  
Robert Sinclair
Keyword(s):  
Thin Films ◽  
Phase Formation ◽  
Metastable Phase ◽  
Silicon Thin Films ◽  
Metastable Phase Formation ◽  
Titanium Silicon

Crystallization Studies of Glassy Te-Se-Br Thin Films

1989 ◽  
Vol 172 ◽  
Author(s):  
J. L. Adam ◽  
C. Ortiz ◽  
J. R. Salem ◽  
X. H. Zhang
Keyword(s):  
Thin Films ◽  
Heat Flow ◽  
Laser Power ◽  
Network Formation ◽  
Laser Energy ◽  
Pulse Length ◽  
Three Dimensional ◽  
Complete Loss ◽  
Fractal Network ◽  
Laser Pulse Length

AbstractWe have studied the effect of laser irradiation on Te-Se-Br thin films. The major effects were found to be dominated by changes in composition because of the complete loss of Br and variable loss of Se. These losses are measured by EIDS and are reasonable in view of the temperatures obtained from a heat flow calculation. The remaining Te-Se material can be made crystalline under specific conditions of laser pulse length and laser power (which determine the cooling rate). We have been able to establish that the crystallization starts with surface filamentary growth exhibiting fractal network formation. With higher laser energy it tends to coalesce to form three dimensional crystals.

Increase in the laser pulse length of lasers operating on self-quenching transitions

1978 ◽  
Vol 21 (1) ◽  
pp. 66-70 ◽  
Author(s):  
Yu. I. Bychkov ◽  
V. F. Losev ◽  
V. V. Savin ◽  
V. F. Tarasenko
Keyword(s):  
Laser Pulse ◽  
Pulse Length ◽  
Laser Pulse Length

Degradation of Copper-Silver Alloy Thin Films Induced by Annealing

2005 ◽  
Vol 887 ◽  
Author(s):  
S. T. Snyder ◽  
Alex King
Keyword(s):  
Thin Films ◽  
Short Range ◽  
Eutectic Composition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Silver Alloy ◽  
Free Standing ◽  
Diffusion Effects ◽  
Alloy Target ◽  
Short Times

ABSTRACTCopper / silver alloy thin films form with a fine, polycrystalline, metastable crystal structure. The expected effects of annealing include grain growth, transformation into the two stable phases, coarsening of the phases, texture formation, and the formation and growth of pinholes or voids. Copper/silver alloy films were deposited on single crystal sodium chloride substrates, via pulsed laser deposition ablation of an alloy target, of the eutectic composition. Free-standing films of 20-30 nm thickness were studied as-deposited and after annealing on copper TEM grids at 100°C for various times. Although several of the expected degradation processes involve short-range diffusion – essentially single atomic jumps – these were not observed, while other, longer-range diffusion effects were clearly identifiable. In particular, void shrinkage was observed in the films at short times, and void growth occurred at longer times.

scholarly journals Metastable phase formation of Pt-X (X = Ir, Au) thin films

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Aparna Saksena ◽  
Yu-Chuan Chien ◽  
Keke Chang ◽  
Pauline Kümmerl ◽  
Marcus Hans ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Formation ◽  
Metastable Phase ◽  
Metastable Phase Formation ◽  
Au Thin Films
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