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Related Concept Videos

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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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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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.
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Updated: Nov 7, 2025

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
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Atomic adsorption on monolayer Cu2Se: a first-principles study.

Yizhou You1, Huimin Hu, Jin-Ho Choi

  • 1College of Energy, Soochow Institute for Energy and Materials Innovations, Soochow University, Suzhou 215006, China. jhchoi@suda.edu.cn.

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Adsorbing various elements onto two-dimensional (2D) copper selenide (Cu2Se) modifies its electronic properties and work function. This study shows atomic adsorption can optimize 2D Cu2Se material characteristics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Two-dimensional (2D) materials offer unique properties for advanced applications.
  • Monolayer copper selenide (Cu2Se) is a novel 2D material with underexplored fundamental characteristics.

Purpose of the Study:

  • Investigate the adsorption behavior of diverse elements on monolayer Cu2Se.
  • Determine the impact of atomic adsorption on the electronic properties and structure of 2D Cu2Se.

Main Methods:

  • Utilized first-principles density functional theory (DFT) calculations.
  • Simulated adsorption of various metallic (Li, Na, Al, K, Ca, Fe, Co, Ni, Cu, Zn, Pd, Ag, Pt, Au) and non-metallic (H, B, C, N, O) elements.

Main Results:

  • All considered adatoms exhibited exothermic adsorption with significant binding energies.
  • Monolayer Cu2Se maintained its layered structure despite strong bonding with adsorbates.
  • Atomic adsorption induced substantial modifications in electronic properties, including the formation of mid-gap states (N, Fe, Co, Ni, Au) and induced magnetic moments (except Au).
  • Work function of monolayer Cu2Se was altered due to electronic structure changes.

Conclusions:

  • Atomic adsorption is an effective strategy for tuning the properties of monolayer Cu2Se.
  • The study highlights the potential of functionalizing 2D Cu2Se for tailored electronic and magnetic applications.