Femtosecond laser-induced phase transformations in amorphous Cu77Ni6Sn10P7 alloy

Abstract

In this study, the femtosecond laser-induced crystallization of CuNiSnP amorphous ribbons was investigated by utilizing an amplified Ti:sapphire laser system. X-ray diffraction and scanning electronic microscope were applied to examine the phase and morphology changes of the amorphous ribbons. Micromachining without crystallization, surface patterning, and selective crystallization were successfully achieved by changing laser parameters. Obvious crystallization occurred under the condition that the laser fluence was smaller than the ablation threshold, indicating that the structural evolution of the material depends strongly on the laser parameters. Back cooling method was used to inhibit heat accumulation; a reversible transformation between the disordered amorphous and crystalline phases can be achieved by using this method.

Nanodrilling of fused silica using nanosecond laser radiation

“…This effect can be most likely explained by a crystallization effect of the molybdenum. The laser-induced crystallization is well-known for different materials [48][49][50].…”

Dense Amorphous Passivation Layer Formed on Aluminum Alloy Surfaces by Femtosecond Laser-Assisted Oxygen-Rich Doping

“…As shown in Figure 4a, the GIXRD measurement results demonstrate that the typical broad amorphous peaks begin to appear for both laser-processed samples within a diffraction angle range from 2θ = 20.33 to 33.65°, much different from the flat observation in the bare sample, which indicates a phase composition transiting from the crystalline to the amorphous states. 40,41 For the femtosecond laser treatment of samples in the oxygen-rich environment, an identifiable amorphous hump can be manifested, which is attributed to the cooling rate of materials accelerated by the oxygen-rich doping. 42,43 In addition, the narrow diffraction peaks corresponding to γ-Al 2 O 3 (200) and (220) crystalline phases (JCPDS card #75-0921) can be observed in both laser-processed samples, whose 4c, where the LPO-50 sample is seen to contain the highest percentage of the oxygen doping on the surface.…”

Phase Nanoengineering via Thermal Scanning Probe Lithography and Direct Laser Writing

“…[96] Besides the widely studied GST, other phase change materials, and also geometries and patterning parameters have been investigated, such as 𝜆-dependent DLW on Ag 8 In 14 Sb 55 Te 23 [97] and selective reversible crystallization of Cu 77 Ni 6 Sn 10 P 7 ribbons. [98] A noteworthy application is the fabrication of monolithic serial interconnection of solar cells made of Cu(In x , Ga 1-x )Se 2 chalcopyrite through the laser tuning of the electrical conductivity (Figure 5b), which turns out to be higher in exposed regions due to selective vaporization entailing larger fraction of copper, gallium, and zinc. [99] Since the discovery of graphene in 2004, the physics and applications of 2D materials have gained more and more interest.…”