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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Metallic Solids02:37

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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Speed of Sound in Solids and Liquids00:51

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Most solids and liquids are incompressible—their densities remain constant throughout. In the presence of an external force, the molecules tend to restore to their original positions, which is only possible because the constituents interact. The interactions help the constituents pass on information about external disturbances, like sound waves. Therefore, sound waves travel faster through these media. Compared to solids, the constituents in a liquid are less tightly bound. Thus, sound...
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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Defects, Sound Damping, and the Boson Peak in Amorphous Solids.

Elijah Flenner1, Grzegorz Szamel1

  • 1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States.

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Anomalous properties of glasses, like specific heat peaks and thermal conductivity plateaus, are linked to sound attenuation from defects. New Debye relations explain these phenomena, particularly the boson peak in different glass dimensions.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Amorphous solids

Background:

  • Glasses exhibit universal anomalous properties: a specific heat peak and a thermal conductivity plateau around the same temperature.
  • This coincidence suggests a common underlying physical mechanism, possibly related to sound attenuation and structural defects.

Purpose of the Study:

  • To investigate the relationship between anomalous thermal properties and sound attenuation in glasses.
  • To identify potential defects responsible for strong sound damping and their connection to quasi-localized excitations.
  • To refine generalized Debye relations for describing sound damping and excess modes in glasses.

Main Methods:

  • Analysis of Rayleigh scaling of sound attenuation to infer defect scattering.
  • Examination of candidate defects associated with quasi-localized excitations and excess modes beyond Debye theory.
  • Derivation and comparison of a new generalized Debye relation with existing ones.

Main Results:

  • A strong correlation was found between specific heat anomalies, thermal conductivity plateaus, and sound attenuation due to defects.
  • The derived generalized Debye relation closely matches previous approximations at low frequencies and reproduces the density of states.
  • Discrepancies arise around the boson peak, with generalized Debye relations accurately predicting it in 2D glasses but underestimating it in 3D glasses.

Conclusions:

  • The study provides a unified explanation for anomalous thermal properties in glasses through defect-induced sound attenuation.
  • The new generalized Debye relation offers an improved framework for understanding sound-matter interactions in amorphous solids.
  • The findings highlight differences in boson peak behavior between 2D and 3D glasses, suggesting dimensional dependence of defect dynamics.