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Metallic Solids

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....

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Updated: Jun 10, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Hierarchical exsolution in vertically aligned heterostructures.

Javier Zamudio-García^1,2, Francesco Chiabrera³, Armando Morin-Martínez³

¹Department of Energy Conversion and Storage, Technical University of Denmark, Lyngby, Denmark. zamudio@uma.es.

Nature Communications

|October 17, 2024

Summary

This summary is machine-generated.

Nickel nanoparticle exsolution from oxide hosts is key for energy devices. Vertically aligned nanostructures offer faster diffusion and controlled nanoparticle formation for improved device performance.

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Area of Science:

Materials Science
Nanotechnology
Catalysis

Background:

Metal nanoparticle exsolution from oxide hosts is crucial for enhancing energy conversion and storage devices.
Understanding exsolution mechanisms is vital for optimizing material performance.

Purpose of the Study:

To investigate nickel exsolution mechanisms in a vertically aligned nanostructure (VAN) thin film.
To explore the role of hierarchical architecture in controlling nanoparticle formation.

Main Methods:

Experimental characterization of heteroepitaxial (Sr0.9Pr0.1)0.9Ti0.9Ni0.1O3-δ-Ce0.9Gd0.1O1.95 thin films.
Density Functional Theory (DFT) calculations.
Kinetic studies at various temperatures and times.

Main Results:

VANs provide faster and more selective Ni diffusion pathways via vertical interphases compared to bulk diffusion.
Nanoparticle nucleation occurs at the surface through column phase boundaries.
Vertical strain is essential for maintaining film microstructure and robust architecture.

Conclusions:

Hierarchically structured VANs enable controlled metal nanoparticle exsolution.
This approach offers new avenues for designing efficient energy devices through advanced structural engineering.