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Related Concept Videos

Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Ionic Strength: Overview01:12

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The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
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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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Exploring the relative influence of atomic parameters on solid solution strengthening.

P H F Oliveira1, C L G P Martins2, G C Stumpf2

  • 1Department of Materials Engineering, Federal University of São Carlos, São Carlos, SP, Brazil. pedro.oliveira@ufscar.br.

Nature Communications
|October 6, 2025
PubMed
Summary
This summary is machine-generated.

Atomic volume differences are the main driver of solid solution strengthening in alloys, surpassing electronegativity. Grain refinement also impacts mechanical properties, but atomic size effects are dominant for alloy design.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Solid Solution Strengthening

Background:

  • Predictive models for solid solution strengthening are crucial for alloy design and mechanical property optimization.
  • Previous studies often focused on single factors, limiting comprehensive understanding.

Purpose of the Study:

  • To identify the primary factor governing solid solution strengthening.
  • To provide foundational insights for developing more accurate predictive models in alloy design.

Main Methods:

  • Developed single-phase solid solution alloys with varying atomic volumes and electronegativities.
  • Utilized alloys designed to assess both atomic volume and electronegativity differences simultaneously.
  • Investigated the interplay between solid solution strengthening and grain refinement.

Main Results:

  • Demonstrated that atomic volume differences are the dominant factor in solid solution strengthening.
  • Identified a critical grain size where grain refinement influences mechanical properties more than solid solution strengthening.
  • Produced a Ni50Pd50 alloy exhibiting stable mechanical properties across varying grain sizes.

Conclusions:

  • Atomic size mismatch is the key parameter for solid solution strengthening.
  • Alloy design must consider both solid solution strengthening and grain size effects for optimal mechanical properties.
  • The Ni50Pd50 alloy serves as a model for stable mechanical behavior.