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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.
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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 process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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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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Quantum Critical Behavior in a Concentrated Ternary Solid Solution.

Brian C Sales1, Ke Jin1, Hongbin Bei1

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA 37831-6056.

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|May 19, 2016
PubMed
Summary
This summary is machine-generated.

Nickel-Cobalt-Chromium (NiCoCr) alloys near a specific composition exhibit unusual properties, suggesting a quantum critical region. These findings offer a unique system for studying quantum criticality in disordered materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Critical Phenomena

Background:

  • Face-centered cubic (fcc) NiCoCr alloys with chromium (Cr) concentration near x≈1 approach a ferromagnetic transition temperature (Tc) of 0 K.
  • This composition range is near a quantum critical point, where material properties deviate significantly from standard models.

Purpose of the Study:

  • To investigate the low-temperature electrical, magnetic, and thermodynamic properties of NiCoCr alloys near the quantum critical region.
  • To explore the potential of these alloys as a tunable system for studying quantum critical behavior.

Main Methods:

  • Experimental synthesis and characterization of NiCoCr alloys with varying compositions.
  • Low-temperature measurements of electrical resistivity, magnetic properties, and heat capacity.

Main Results:

  • Observed linear temperature dependence of resistivity down to 2 K.
  • Detected linear magnetoresistance.
  • Identified an excess -TlnT (or power law) contribution to low-temperature heat capacity and excess entropy.
  • These properties deviate from typical Fermi liquid behavior, indicating strong magnetic fluctuations.

Conclusions:

  • NiCoCr alloys near x≈1 exhibit non-Fermi liquid behavior characteristic of a quantum critical region.
  • Extreme chemical disorder in this fcc system provides a novel platform for studying quantum criticality.
  • The tunable nature of these alloys makes them ideal for further investigations into quantum critical phenomena.