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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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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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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Orden de orientación dependiente del enrejado en cristales activos

Till Welker1,2, Ricard Alert2,3,4

  • 1School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom. t.a.welker@sms.ed.ac.uk.

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Resumen

Los cristales activos exhiben un orden posicional y orientativo acoplado. Los investigadores exploraron cómo las interacciones de partículas influyen en la alineación, revelando estrategias para controlar el orden de orientación mediante la ingeniería de redes cristalinas.

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Área de la Ciencia:

  • La física
  • Física de la materia blanda
  • La materia activa

Sus antecedentes:

  • Las partículas autopropulsadas pueden formar fases ordenadas como cristales y bandadas a través de mecanismos de no equilibrio.
  • La interacción entre el orden posicional (cristalinidad) y el orden de orientación en los sistemas activos no se entiende bien.

Objetivo del estudio:

  • Investigar el acoplamiento entre el orden posicional y el de orientación en cristales de partículas activas.
  • Explorar cómo las interacciones entre partículas influyen en la alineación de partículas activas dentro de una estructura cristalina.

Principales métodos:

  • Cristales estudiados de partículas activas con interacciones que los hacen girar hacia o lejos el uno del otro.
  • Mapeó la dinámica de orientación a un modelo de red de espín con interacciones ferromagnéticas / antiferromagnéticas y nemáticas.

Principales resultados:

  • Las partículas activas se alinean a lo largo de las direcciones dictadas por la red cristalina subyacente.
  • El grado de alineación depende de cómo las interacciones entre partículas varían con la distancia.

Conclusiones:

  • El orden posicional y la orientación están fuertemente acoplados en los cristales activos.
  • La ingeniería de la red cristalina ofrece un método para controlar el orden de orientación de las partículas activas.