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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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
28.2K
Properties of Transition Metals02:58

Properties of Transition Metals

27.7K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
27.7K
Colors and Magnetism03:02

Colors and Magnetism

12.5K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Valence Bond Theory02:42

Valence Bond Theory

9.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Commensurate Stacking Phase Transitions in an Intercalated Transition Metal Dichalcogenide.

Xiaohui Yang1,2,3, Jin-Ke Bao4,5, Zhefeng Lou1,2,3

  • 1Zhejiang Province Key Laboratory of Quantum Technology and Device, Department of Physics, Zhejiang University, Hangzhou, 310027, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|December 6, 2021
PubMed
Summary

We report the first 124-phase Pb-intercalated transition metal dichalcogenide, Pb(Ta1+x Se2 )2, which exhibits unique structural transitions and superconductivity. This discovery advances stacking-order engineering in materials.

Keywords:
intercalated transition metal dichalcogenidesstacking phase transitionssuperconductivitytopological bands

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Intercalation and stacking-order modulation are key strategies for tuning interlayer interactions in transition metal dichalcogenides (TMDCs).
  • These methods enable the engineering of material properties and the emergence of novel electronic phases.

Purpose of the Study:

  • To report the growth of a novel Pb-intercalated TMDC, specifically the 124-phase Pb(Ta1+x Se2 )2.
  • To investigate the structural phase transitions and superconducting properties of this new material.

Main Methods:

  • Crystal growth of Pb-intercalated TMDCs.
  • Temperature-dependent X-ray diffraction to study structural transitions.
  • First-principle calculations to understand the underlying physics.
  • Symmetry analysis of band structures.

Main Results:

  • Pb(Ta1+x Se2 )2 exhibits a two-step first-order structural phase transition around 230 K, driven by changes in stacking order (ABC to AB to ACB).
  • Gigantic lattice contractions are observed during warming through the transitions.
  • Bulk superconductivity with a critical temperature (Tc) of approximately 1.8 K is observed at low temperatures.
  • Topological nodal lines are identified in the electronic band structure.

Conclusions:

  • The study demonstrates the feasibility of creating higher-order metal-intercalated TMDC phases.
  • The findings advance the understanding of polymorphic transitions and their relation to stacking order.
  • This work may inspire new approaches for stacking-order engineering in TMDCs and other layered materials.