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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...

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Related Experiment Video

Updated: Jul 18, 2026

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
09:25

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

Interlayer coupling in ferroelectric bilayer and superlattice heterostructures.

Shan Zhong1, S Pamir Alpay, Alexander L Roytburd

  • 1Department of Materials Science and Engineering and Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 26, 2006
PubMed
Summary

Ferroelectric multilayers exhibit unique properties due to internal fields. Thermodynamic analysis reveals how layer interactions influence ferroelectric behavior and dielectric response in these advanced materials.

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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

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Last Updated: Jul 18, 2026

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

Published on: March 27, 2018

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Thermodynamics

Background:

  • Ferroelectric multilayers and superlattices are explored for dynamic random access memory (DRAM) and tunable microwave devices.
  • Experimental studies reveal complex properties in heterostructures not explained by simple layer summation.

Purpose of the Study:

  • To provide a thermodynamic analysis of interactions within ferroelectric multilayers.
  • To quantitatively describe the coupling strength using established physical theories.
  • To investigate the impact of compositional variations and electrostatic coupling on ferroelectric properties.

Main Methods:

  • Application of Landau theory of phase transformations.
  • Utilizing the theory of elasticity.
  • Employing principles of electrostatics for thermodynamic modeling.

Main Results:

  • Demonstrated interaction via internal elastic, electrical, and electromechanical fields.
  • Showed that broken spatial inversion symmetry in bilayers leads to asymmetric thermodynamic potentials.
  • Identified strong electrostatic coupling causing ferroelectricity suppression at a critical thickness in ferroelectric-paraelectric bilayers.

Conclusions:

  • Ferroelectric multilayer behavior is governed by complex internal field interactions.
  • Theoretical modeling accurately describes these interactions and their impact on material properties.
  • Ferroelectric-paraelectric bilayers exhibit a gigantic dielectric response at a critical thickness, offering potential for novel device applications.