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Related Concept Videos

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Metallic Solids02:37

Metallic Solids

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. Many...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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,...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...

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Related Experiment Video

Updated: Jul 3, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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3D framework containing Cu4Br4 cubane as connecting node with strong ferroelectricity.

Wen Zhang1, Ren-Gen Xiong, Songping D Huang

  • 1Ordered Matter Science Research Center, Southeast University, Nanjing 211189, PR China.

Journal of the American Chemical Society
|July 19, 2008
PubMed
Summary

Researchers synthesized a novel homochiral 3D framework using (S)-1,4-diallyl-2-methylpiperazine (DAMP) and CuBr. This framework exhibits enhanced ferroelectricity, comparable to BaTiO3, by mimicking inorganic roles.

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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Published on: April 8, 2018

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Last Updated: Jul 3, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
10:40

A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy

Published on: April 8, 2018

Area of Science:

  • Materials Chemistry
  • Crystallography
  • Solid-State Chemistry

Background:

  • Ferroelectric materials are crucial for electronic devices.
  • Developing new ferroelectrics with high performance is an ongoing challenge.
  • Metal-organic frameworks offer tunable properties for various applications.

Purpose of the Study:

  • To synthesize a novel homochiral 3D framework using (S)-1,4-diallyl-2-methylpiperazine (DAMP) and copper(I) bromide (CuBr).
  • To investigate the potential of this framework in enhancing ferroelectric properties.
  • To compare the performance of the synthesized material with established ferroelectrics like BaTiO3.

Main Methods:

  • Methanolothermal reaction between (S)-1,4-diallyl-2-methylpiperazine (DAMP) and excess CuBr.
  • Structural characterization of the resulting 3D framework, denoted as (DAMP)3(Cu4Br4)2(H2O)3 (1).
  • Evaluation of ferroelectric properties, focusing on remnant polarization.

Main Results:

  • A novel homochiral 3D framework (DAMP)3(Cu4Br4)2(H2O)3 (1) was successfully synthesized.
  • The framework incorporates Cu4Br4 cubane units acting as nodes, mimicking inorganic roles in ferroelectricity.
  • The material demonstrated a remnant polarization value comparable to that of BaTiO3.

Conclusions:

  • The synthesized homochiral 3D framework shows promising ferroelectric behavior.
  • The incorporation of Cu4Br4 cubanes contributes to enhanced ferroelectric properties.
  • This study presents a new avenue for designing high-performance ferroelectric materials using metal-organic frameworks.