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Distinguish among and compare the characteristics of molecular, covalent, ionic, and metallic solids. Give two examples of each kind of solid.What type(s) of bonding would be expected for each of the following materials (match with the correct ...
Among these metals, Pd metal is more promising due to its advantages such as auto-catalyzed nature for hydrogen dissociation, high resistance towards hydrogen gas, and outstanding permeability [64]. Nevertheless, these membranes are very expansive, and low membrane durability due to this metallic is...
Following the discovery of high-temperature superconductivity in the La–H system, we studied the formation of new chemical compounds in the barium-hydrogen system at pressures from 75 to 173 GPa. Using in situ generation of hydrogen from NH3BH3, we synthesized previously unknown superhydride Ba...
The complex degradation of metallic materials in aggressive environments can result in morphological and microstructural changes. The phase-field (PF) method is an effective computational approach to understanding and predicting the morphology, phase change and/or transformation of materials. PF models are...
The reducing agent is added after the metallic magnetic powder is uniformly dispersed into the treatment liquid. As such a reducing agent, a strong reducing agent such as hydrazine (N2H2), lithium aluminium hydride (LiAlH4), and sodium boron hydride (NaBH4) can be used. The concentration of...
Besides general aspects on phase composition of the system and hydrogen storage capability, the work also addressed the problem of obtaining activation energy values in the thermal decomposition of magnesium hydride powders...
The crystal structures and properties of hafnium hydride under pressure are explored using the first-principles calculations based on density function theory. The material undergoes pressure-induced structural phase transition I4/mmm→Cmma→P21/m at 180
For example, the face-centered cubic (FCC) structure of Cantor alloys (CoCrFeMnNi) [27], the body-centered cubic (BCC) structure of TiZHfNbTa alloy [28], and other high-entropy alloy systems have been extensively investigated [29,30,31,32,33]. Among the various HEA systems, WMoTaNb ...
So far, a large number of intermetallic hydrides have been studied (e.g., Laves phases AB–FeTi, AB2–ZrMn2, ZrV2, AB5–LaNi5, CaNi5 and A2B–Mg2Ni), where element A is a hydride-forming element and element B is a non-hydride-forming element [4,12]. In order to tune the ...