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Related Concept Videos

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

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Hydrogen Charging of Aluminum using Friction in Water
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Published on: January 28, 2020

Preparation-Dependent Microstructure and Hydrogen Storage in High-Entropy Alloys.

Chen Chen1, Quanhui Hou2, Yunxuan Zhou3

  • 1Department of Mechanics, Jinzhong University, Jinzhong 030606, China.

Molecules (Basel, Switzerland)
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

Microstructure, not just composition, dictates high-entropy alloy (HEA) performance for hydrogen storage. Preparation methods create unique structures influencing hydrogen interactions and storage capabilities.

Keywords:
high-entropy alloysmechanical alloyingmicrostructurepreparation routerefractory alloyssolid-state hydrogen storage

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Last Updated: May 28, 2026

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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Hydrogen Storage Technologies

Background:

  • High-entropy alloys (HEAs) show promise for solid-state hydrogen storage due to tunable properties.
  • Hydrogen storage behavior in HEAs is complex and not solely predictable by composition.
  • The preparation method significantly impacts the resulting microstructure and thus performance.

Purpose of the Study:

  • To examine how different preparation routes influence the microstructural states of HEAs.
  • To correlate these distinct structural states with hydrogen accommodation, diffusion, and reversibility.
  • To evaluate key structural descriptors for understanding hydrogen storage in HEAs.

Main Methods:

  • Analysis of HEAs prepared via arc melting and homogenization.
  • Investigation of HEAs produced by mechanical alloying and reactive ball milling.
  • Evaluation of structural descriptors: phase constitution, grain size, defect density, and chemical homogeneity.

Main Results:

  • Arc melting yields bulk alloys with simpler average phase constitutions.
  • Mechanical alloying and ball milling produce defect-rich, metastable, non-equilibrium structures.
  • Similar compositions exhibit different hydriding pathways based on their realized structural state.

Conclusions:

  • Microstructure, determined by preparation route, is the critical factor governing HEA hydrogen storage.
  • Future advancements require focusing on microstructure-hydrogen-storage relationships over composition screening alone.
  • Developing transferable relationships across route-defined structural states is key for progress.