Phase Control and Formation Mechanism of New-Phase Layer-Structured Rhombohedral In3Se4 Hierarchical Nanostructures

2013 ◽  
Vol 13 (11) ◽  
pp. 5092-5099 ◽  
Author(s):  
Guang Han ◽  
Zhi-Gang Chen ◽  
Lei Yang ◽  
Lina Cheng ◽  
John Drennan ◽  
...  
Keyword(s):  
Formation Mechanism ◽  
Phase Control ◽  
Phase Layer ◽  
Hierarchical Nanostructures ◽  
New Phase

scholarly journals The Formation Mechanism of a Self-Organized Periodic-Layered Structure at the Solid-(Cr, Fe)2B/Liquid-Al Interface

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3869
Author(s):  
Mengmeng Wang ◽  
Jiang Ju ◽  
Jingjing Li ◽  
Yang Zhou ◽  
Haiyang Lv ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Formation Mechanism ◽  
Layered Structure ◽  
Electron Backscatter Diffraction ◽  
Reaction Products ◽  
Phase Layer ◽  
Transmission Electron ◽  
Potential Formation ◽  
Backscatter Diffraction ◽  
Periodic Layered Structure

A periodic-layered structure was observed in solid-(Cr, Fe)2B/liquid-Al diffusion couple at 750 °C. The interface morphology, the reaction products, and the potential formation mechanism of this periodic-layered structure were investigated using an electron probe microanalyzer (EPMA), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and energy-dispersive spectroscopy (EDS). The results indicate that the reaction between (Cr, Fe)2B and liquid Al is a diffusion-controlled process. The formation of intermetallics involves both the superficial dissolution of Fe and Cr atoms and the inward diffusion of Al at the interface. The layered structure, as characterized by various experimental techniques, is alternated by a single FeAl3 layer and a (FeAl3 + Cr3AlB4) dual-phase layer. A potential mechanism describing the formation process of this periodic-layered structure was proposed based on the diffusion kinetics based on the experimental results.

Assembly of monoclinic ZrO2nanorods: formation mechanism and crystal phase control

CrystEngComm ◽  
2016 ◽  
Vol 18 (4) ◽  
pp. 580-587 ◽  
Author(s):  
Aling Chen ◽  
Yan Zhou ◽  
Shu Miao ◽  
Yong Li ◽  
Wenjie Shen
Keyword(s):  
Formation Mechanism ◽  
Phase Control ◽  
Crystal Phase

The Hybrid Effect of Al and Cr in Zinc Bath on Galvanizing Coatings

2012 ◽  
Vol 538-541 ◽  
pp. 306-310
Author(s):  
Ya Liu ◽  
Xu Ping Su ◽  
Jian Hua Wang ◽  
Zhi Li ◽  
Hao Tu
Keyword(s):  
Diffusion Path ◽  
Morphology Evolution ◽  
Zinc Bath ◽  
Phase Layer ◽  
Hybrid Effect ◽  
X Ray ◽  
Δ Phase ◽  
Al Coating ◽  
New Phase ◽  
Scanning Electron

The hybrid effect of Al and Cr in zinc bath on galvanizing coatings were studied by means of scanning electron microscope (SEM) and energy dispersive X-ray spectroscope (EDS), coupled with hot-dip galvanizing experiments. A new phase T1 was found in the coating, and the ζ phase was absent when hot-dip galvanizing at 480 °C. When Cr added zinc bath were alloyed with 0.1 wt.% Al, coating was composed of δ, ζ, η and T1 phases; when Cr added zinc bath were alloyed with 0.2 wt.% Al, δ phase layer became thinner, ζ changed from even layer to blocky crystals, and diffuse-Δ coexisted with the ζ phase. The morphology evolution of galvanizing coating was analyzed and the hybrid effect of Al and Cr were discussed with diffusion path theory.

Electron microscopy of niobium and tantalum hydrides

1978 ◽  
Vol 36 (1) ◽  
pp. 644-645
Author(s):  
T. Schober
Keyword(s):  
Electron Microscopy ◽  
Heat Storage ◽  
Measurement Techniques ◽  
Metal Hydrides ◽  
Detailed Understanding ◽  
Storage Devices ◽  
Unit Cells ◽  
Endothermic Reactions ◽  
Hydrogen Reactions ◽  
New Phase

Nb, Ta and V are prototype substances for the study of the endothermic reactions of H with metals. Such metal-hydrogen reactions have gained increased importance due to the application of metal-hydrides in hydrogen- und heat storage devices. Electron microscopy and diffraction were demonstrated to be excellent methods in the study of hydride morphologies and structures (1). - Figures 1 and 2 show the NbH and TaH phase diagrams (2,3,4). EM techniques have contributed substantially to the elucidation of the structures and domain configurations of phases β, ζ and ε (1,4). Precision length measurement techniques of distances in reciprocal space (5) recently led to a detailed understanding of the distortions of the unit cells of phases ζ and ε (4). In the same work (4) the existence of the new phase η was shown. It is stable near -68 °C. The sequence of transitions is thus below 70 %.

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