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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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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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Crystallisation in a two-dimensional granular system at constant temperature.

M Ledesma-Motolinía1, J L Carrillo-Estrada1, F Donado2

  • 1Instituto de Física "Luis Rivera Terrazas", Benemérita Universidad Autónoma de Puebla, Puebla, 72570, Mexico.

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|August 17, 2021
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Summary
This summary is machine-generated.

In a 2D magnetic granular system, effective temperature controls particle aggregation and crystallization. Lower temperatures promote aggregate formation, while medium temperatures lead to crystal growth, influenced by magnetic field strength.

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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Studying crystallization in 2D magnetic granular systems is crucial for understanding self-assembly and phase transitions.
  • Dissipative effects and energy input balance influence system dynamics.

Purpose of the Study:

  • To investigate the influence of effective temperature on crystallization processes in a 2D magnetic granular system.
  • To determine the role of magnetic field amplitude in aggregate formation.

Main Methods:

  • Simulating a non-vibrating 2D magnetic granular system with continuous energy input from a sinusoidal magnetic field.
  • Varying effective temperature and magnetic field amplitude to observe system behavior.
  • Analyzing particle aggregation, cluster formation, and crystal growth using order parameters.

Main Results:

  • High effective temperatures prevent aggregate formation due to high kinetic energy.
  • Lower effective temperatures lead to the formation of disordered aggregates, with smaller magnetic field amplitudes resulting in more aggregates.
  • Medium effective temperatures promote the formation of small crystals.
  • The sixth bond-orientational order parameter and bond count are sensitive indicators of order, even in small crystals.
  • An increasing time leads to a decrease in the average effective diffusion coefficient when clusters form.

Conclusions:

  • Effective temperature is a key parameter governing the transition from disordered aggregation to ordered crystallization in this system.
  • Magnetic field parameters significantly influence the morphology and extent of aggregation.
  • Bond-orientational order parameters are effective tools for early detection of crystalline order in granular systems.