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Related Concept Videos

Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Molecular and Ionic Solids

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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Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Updated: May 27, 2026

Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
08:43

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Published on: October 27, 2018

Molten salt eutectics from atomistic simulations.

Saivenkataraman Jayaraman1, Aidan P Thompson, O Anatole von Lilienfeld

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. sjayara@sandia.gov

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 9, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a molecular dynamics method to predict phase diagrams for molten salt heat transfer fluids (HTFs). The approach accurately identifies eutectic mixtures and temperatures without complex solid-state calculations.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Computational Chemistry

Background:

  • Molten salt mixtures are crucial for solar thermal power applications.
  • Accurate phase diagrams for these heat transfer fluids (HTFs) are difficult to obtain from first principles.
  • Existing methods for phase diagram determination can be computationally expensive.

Purpose of the Study:

  • To develop a general molecular dynamics (MD) scheme for predicting phase diagrams of molten salt HTF mixtures.
  • To identify eutectic compositions and temperatures efficiently.
  • To overcome limitations of conventional phase diagram mapping methodologies.

Main Methods:

  • Utilized molecular dynamics simulations.
  • Employed thermodynamic integration over particle identity transmutations.
  • Calculated liquid mixture free energy at a single temperature.
  • Determined pure component solid-liquid free energy differences.

Main Results:

  • Successfully identified eutectic mixtures and temperatures for binary and ternary alkali nitrate systems.
  • The developed MD scheme is general for any HTF candidate mixture.
  • Avoided computationally intensive solid mixture free energy calculations.
  • Results showed good agreement with experimental measurements.

Conclusions:

  • The presented molecular dynamics approach provides an efficient and accurate method for determining phase diagrams of molten salt HTFs.
  • This method simplifies the prediction of eutectic points, crucial for optimizing solar thermal power applications.
  • The findings pave the way for designing novel HTF mixtures with improved performance.