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Metallic Solids

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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.
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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

Synthesis of Bimetallic Pt/Sn-based Nanoparticles in Ionic Liquids

Published on: August 23, 2018

Diffuse scattering in metallic tin polymorphs.

Björn Wehinger¹, Alexeï Bosak, Giuseppe Piccolboni

¹European Synchrotron Radiation Facility, BP 220 F-38043 Grenoble Cedex 9, France.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 5, 2014

Summary

This summary is machine-generated.

Lattice dynamics of metallic tin polymorphs were studied using diffuse scattering and inelastic X-ray scattering. Density functional theory accurately described phonon behavior and electronic influences in beta-tin and gamma-tin structures.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid-State Physics

Background:

Tin exhibits multiple polymorphs, including beta-tin and gamma-tin, with distinct crystal structures.
Understanding lattice dynamics is crucial for predicting material properties and phase transitions.

Purpose of the Study:

To investigate the lattice dynamics of beta-tin and gamma-tin polymorphs.
To elucidate the influence of electronic structure on phonon behavior.
To compare the lattice dynamics of different tin phases.

Main Methods:

Diffuse scattering
Inelastic X-ray scattering (IXS)
Density Functional Perturbation Theory (DFPT)

Main Results:

Observed strong resemblance in diffuse scattering patterns between beta-tin and gamma-tin, indicating shared structural and electronic characteristics.
Identified unusual asymmetry in thermal diffuse scattering for beta-tin due to its non-symmorphic space group.
Anomalies in phonon dispersion relations were linked to the significant influence of the electron subsystem on inter-ionic interactions.

Conclusions:

DFPT successfully describes the lattice dynamics of both beta-tin and gamma-tin across various momentum transfers.
The combined experimental and theoretical approach provides a comprehensive harmonic description of tin's lattice dynamics.
The study highlights the interplay between electronic structure and lattice vibrations in metallic tin.