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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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...
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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...
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Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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

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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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Updated: Mar 25, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Super-crystals in composite ferroelectrics.

D Pierangeli1, M Ferraro1, F Di Mei1,2

  • 1Dipartimento di Fisica, Università di Roma 'La Sapienza', Rome 00185, Italy.

Nature Communications
|February 25, 2016
PubMed
Summary
This summary is machine-generated.

Researchers discovered a novel cubic structure in ferroelectric potassium-lithium-tantalate-niobate. This mesoscopic super-crystal, with a micrometric lattice constant, has significant implications for 3D optical technologies and critical phenomena.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Crystallography

Background:

  • Crystalline solids exhibit ordered geometry with subnanometric lattice constants.
  • Ferroelectric perovskites can form perfect crystalline structures despite non-stoichiometric composition, leading to disorder and complex properties.
  • Existing research focuses on subnanometric crystalline structures.

Purpose of the Study:

  • To investigate the spontaneous formation of a novel cubic structure in composite ferroelectric potassium-lithium-tantalate-niobate.
  • To characterize this structure's unique properties and potential applications.

Main Methods:

  • Synthesis of specifically designed composite ferroelectric potassium-lithium-tantalate-niobate samples with periodically varying substitutional mixtures.
  • Utilizing laser propagation to observe coherent polarization.
  • Employing X-ray diffractometry to analyze the structure.

Main Results:

  • Observation of a spontaneous cubic structure with a micrometric lattice constant, approximately 10^4 times larger than the perovskite lattice.
  • Identification of a coherent polarization super-crystal.
  • Characterization of an ordered mesoscopic state of matter.

Conclusions:

  • The study reveals a novel mesoscopic ordered state in ferroelectric materials.
  • This discovery has significant implications for understanding critical phenomena.
  • Potential applications exist in miniaturized 3D optical technologies.