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Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

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Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
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The Phase Rule01:20

The Phase Rule

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The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...
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Electron Configurations02:46

Electron Configurations

20.3K
Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
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π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each...
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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

15.9K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
15.9K
Phase Diagram01:19

Phase Diagram

5.9K
The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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New ordered phase in the quasi-binary UAl3-USi3 system.

Gennady Rafailov1, Isaac Dahan1, Louisa Meshi2

  • 1Materials Department, Nuclear Research Center of Negev (NRCN), PO Box 9001, Beer-Sheva, Israel.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|June 4, 2014
PubMed
Summary
This summary is machine-generated.

Researchers identified a new U(Alx,Si1-x)3 phase in the U-Al-Si system. This discovery impacts understanding uranium-based nuclear fuel cladding and its interactions during processing.

Keywords:
electron crystallographyorderingpowder X-ray diffractionstructure solution

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Area of Science:

  • Materials Science
  • Nuclear Engineering
  • Crystallography

Background:

  • The U-Al-Si system is industrially significant for uranium fuel cladding in nuclear reactors.
  • Heat treatment of Al-based cladding with U fuel promotes diffusion, necessitating phase diagram understanding.

Purpose of the Study:

  • To investigate the UAl3-USi3 quasi-binary phase diagram within the ternary U-Al-Si system.
  • To identify and characterize new phases influencing fuel-cladding interactions.

Main Methods:

  • Electron crystallography
  • Powder X-ray diffraction
  • Phase diagram analysis

Main Results:

  • A new stable U(Alx,Si1-x)3 phase was identified.
  • The phase crystallizes in a tetragonal structure (space group I4/mmm) with specific lattice parameters.
  • This phase is an ordered variant of the U(Al,Si)3 solid solution.

Conclusions:

  • The study refines the UAl3-USi3 quasi-binary phase diagram.
  • The newly identified phase provides crucial data for nuclear reactor material design and safety.