In situ study on medium-range order evolution during the polyamorphous phase transition in a Pd-Ni-P nanostructured glass

Engineering Atomic-to-Nano Scale Structural Homogeneity towards High Corrosion Resistance of Amorphous Magnesium-Based Alloys

“…Furthermore, a spheroid model with polydispersity is employed to fit the SAXS profile of the TC-treated sample, and the obtained size distribution function result is displayed in Figure 1c inset [41,42]. It is seen that the diameter of the spheroidal granular-like structure is around 5.4 nm for the TC-treated sample, verifying that the heterogeneous structure exists [43][44][45]. Further down to the atomic scale, Figure 1d compares the structure factor (S(Q)) patterns as a function of momentum transfer amplitude (Q) for both the as-cast and TC-treated alloys.…”

Synthesis of Free‐Standing Pd‐Ni‐P Metallic Glass Nanoparticles with Durable Medium‐Range Ordered Structure for Enhanced Electrocatalytic Properties

“…First, driven by the locally focused picosecond pulse laser, high-temperature metallic atoms and distorted SRO clusters are evaporated from the target. [30,36] These atoms and covalent bond-dominated clusters rapidly cool down owing to their collisions with helium atoms and then coalesce into fully amorphous MGNPs with a composition identical to that of the target. Finally, the condensed MGNPs are transferred along the temperature gradient to the surface of a cold trap filled with liquid N 2 .…”

“…Unlike conventional one-step methods such as PVDs, the separated steps of the SRO formation in this process facilitate precise composition control, which is vital for the glass-forming ability of amorphous systems. [37] Metal-metalloidbased MGs possess a large number of SRO clusters containing covalent bonds; hence, the SRO clusters with specific compositions in the Pd-Ni-P system remain unchanged after evaporation and rapid cooling, [30] and the final composition of the condensed MGNPs can be determined. Furthermore, since condensation toward the cold-trap side occurs at a relatively Small 2023, 19, 2300721 The morphology and amorphous structure of the MGNPs prepared under 800 Pa were investigated using scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM).…”

“…The resulting Pd 40 Ni 40 P 20 bulk MG plate was used as a target to synthesize Pd 40 Ni 40 P 20 MGNPs in an IGC system with a laser evaporation source. [30] An infrared pulsed laser (Yb, YAG) with a wavelength of 1064 nm and a maximum output power of 50 W was used. The maximum energy achievable was 100 µJ in a pulse duration (…”

“…Although these methods can produce MGNPs, the substrates prevent full exposure of the MGNP surface, while the minimal mass loading of the MGNPs and the compositional inhomogeneities bring about additional challenges. Inert-gas condensation (IGC) was proposed as an inspiring approach to fabricate nanostructured bulk MGs, [29,30] wherein an alloy target is vaporized by thermal evaporation. Although MGNPs can also be generated as intermediate products during this process, the discrepant vapor pressures of the alloying elements result in compositional inhomogeneities, especially on the surfaces of the re-alloyed nanoparticles, leading to uncertainties in surface chemistry that severely hinder their electrocatalytic applications.…”