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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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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.
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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Associated Lattice and Electronic Structural Evolutions in Compressed Multilayer ReS2.

Yalan Yan1, Chunlin Jin2, Jia Wang1

  • 1State Key Laboratory of Superhard Materials, College of Physics, Jilin University , No. 2699 Qianjin Street, Changchun 130012, People's Republic of China.

The Journal of Physical Chemistry Letters
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Pressure-induced phase transitions in rhenium disulfide (ReS2) alter its electronic structure, enabling tunable optoelectronic properties for advanced devices. Interlayer coupling significantly influences these changes in transition metal dichalcogenides.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Transition metal dichalcogenides (TMDs) like ReS2 exhibit promising quantum yields for optoelectronic applications.
  • External stimuli, such as pressure, can modify the atomic structure and electronic properties of TMDs.
  • Understanding pressure-induced structural and electronic changes is crucial for material design.

Purpose of the Study:

  • To systematically investigate the lattice and electronic structural evolution of multilayer ReS2 under compression.
  • To elucidate the relationship between lattice variations and electronic band structure changes.
  • To compare the high-pressure behavior of ReS2 with other TMDs like MoS2 to understand interlayer coupling effects.

Main Methods:

  • High-pressure Raman spectroscopy.
  • First-principles calculations.
  • High-pressure photoluminescence (PL) measurements.

Main Results:

  • Observed intralayer and interlayer phase transitions in compressed ReS2.
  • Identified a transition from an indirect to another indirect bandgap at 2.7 GPa, confirmed by PL and calculations.
  • Demonstrated that interlayer coupling is critical for lattice and electronic structure in compressed TMDs, evidenced by comparing ReS2 and MoS2.

Conclusions:

  • Pressure-induced phase transitions in ReS2 lead to significant modifications in its electronic band structure.
  • The study highlights the critical role of interlayer coupling in determining the optoelectronic properties of compressed TMDs.
  • Findings suggest potential applications of ReS2 in fabricating stacking devices with tunable optoelectronic properties.