Laser irradiation-induced modification of the amorphous phase in GeTe films: the role of intermediate Ge–Te bonding in the crystallization mechanism

2015 ◽  
Vol 3 (36) ◽  
pp. 9393-9402 ◽  
Author(s):  
Seung Jong Park ◽  
Hanjin Park ◽  
Moon Hyung Jang ◽  
Min Ahn ◽  
Won Jun Yang ◽  
...  
Keyword(s):  
Phase Change ◽  
Laser Irradiation ◽  
Amorphous Phase ◽  
Change Process ◽  
Crystallization Mechanism ◽  
Bonding Structure ◽  
Phase Change Process ◽  
Local Bonding

Modified amorphous GeTe was analyzed in terms of variations in the local bonding structure. Inducstion of intermediated Ge–Te bonding in modified structure critically affects the phase change process.

Ultralow-fluence single-shot optical crystalline-to-amorphous phase transition in Ge–Sb–Te nanoparticles

Nanoscale ◽  
2018 ◽  
Vol 10 (35) ◽  
pp. 16574-16580 ◽  
Author(s):  
Barbara Casarin ◽  
Antonio Caretta ◽  
Bin Chen ◽  
Bart J. Kooi ◽  
Roberta Ciprian ◽  
...  
Keyword(s):  
Phase Transition ◽  
Laser Pulse ◽  
Phase Change ◽  
Amorphous Phase ◽  
Change Process ◽  
Single Laser Pulse ◽  
Single Shot ◽  
Single Laser ◽  
Phase Change Process

Ge2Sb2Te5 crystalline nanoparticles amorphize through a single laser pulse with exceptional low fluence, boosting the energetics of a phase-change process.

scholarly journals Experimental research on hydrodynamic instabilities during condensation of the pro-ecological refrigerant R1234yf in tubular minichannels

2018 ◽  
Vol 70 ◽  
pp. 02010
Author(s):  
Waldemar Kuczyński ◽  
Aleksander Denis
Keyword(s):  
Experimental Data ◽  
Phase Change ◽  
Experimental Research ◽  
Change Process ◽  
Internal Diameter ◽  
Hydrodynamic Instabilities ◽  
Condensation Zone ◽  
Phase Change Process ◽  
Flow Condensation ◽  
Propagation Velocities

The following paper presents the results of preliminary experimental research on the influence of instabilities of a hydrodynamic type on the condensation phase change process in tubular minichannels. The research was focused on a new pro-ecological refrigerant, R1234yf, intended as a substitute for R134a that currently is being phased out. The flow condensation phase change process was investigated for both steady and un-steady conditions in singular tubular minichannels with an internal diameter d = {1,44; 2,30; 3,30} mm. The scope of the analysis of the experimental data covered an estimation of propagation velocities for both pressure and temperature instabilities as well as the shrinkage of the condensation zone. The results were also compared with the previous results obtained for the flow condensation phase change of R134a refrigerant in tubular minichannels with the same internal diameters.

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