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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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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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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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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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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
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Murine Full-thickness Skin Transplantation
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Solid Parahydrogen Thickness Revisited.

Mario E Fajardo1

  • 1Air Force Research Laboratory, Munitions Directorate, Ordnance Division, Energetic Materials Branch, Eglin AFB, USA.

Applied Spectroscopy
|June 21, 2019
PubMed
Summary
This summary is machine-generated.

Updated infrared absorption measurements reveal a 10% systematic error in previous parahydrogen (pH2) solid thickness determination. A new method using the QR(0) phonon sideband offers a faster, more accurate thickness measurement for cryogenic solids.

Keywords:
IRSolid parahydrogeninfrared absorptionmatrix isolation spectroscopypH2polarized IR absorption spectroscopyrapid vapor depositionsample thickness determination

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Area of Science:

  • Spectroscopy
  • Condensed Matter Physics
  • Materials Science

Background:

  • Infrared (IR) absorption spectroscopy is crucial for characterizing materials.
  • Accurate determination of solid thickness is essential for quantitative analysis.
  • Previous methods for determining parahydrogen (pH2) solid thickness had known limitations.

Purpose of the Study:

  • To report updated IR absorption measurements on cryogenic parahydrogen solids.
  • To correct previously reported integrated absorption intensities.
  • To introduce a novel, more efficient method for determining pH2 solid thickness.

Main Methods:

  • Vapor-deposited cryogenic parahydrogen (pH2) solids were prepared.
  • Infrared absorption spectroscopy was employed to measure absorption bands.
  • Polarized IR spectroscopy was utilized to investigate specific spectral features.

Main Results:

  • A ≈10% systematic error was identified in the previous thickness determination method.
  • Corrected integrated absorption intensities for Q1(0)+S0(0) and S1(0)+S0(0) bands are provided.
  • The QR(0) phonon sideband near 4228 cm-1 was found to be insensitive to polarization, enabling rapid thickness determination.

Conclusions:

  • The previous method for determining pH2 solid thickness requires correction.
  • The QR(0) phonon sideband provides a more efficient and reliable means for thickness measurement.
  • These findings improve the accuracy of quantitative spectroscopic analysis of cryogenic solids.