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Related Concept Videos

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...
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Theory of Metallic Conduction01:17

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Valence Bond Theory02:42

Valence Bond Theory

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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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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...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Pressure-Induced Evolution of Structure and Conduction Mechanism Transition in Ba0.5Sr0.5TiO3.

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High pressure transforms Barium Strontium Titanate (BST) from ferroelectric to paraelectric, suppressing polarization and reducing permittivity. Electronic conduction increases, impacting dielectric loss in this perovskite material.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Barium strontium titanate (BST) is a key perovskite ferroelectric material.
  • BST exhibits promising properties for advanced electronic devices.

Purpose of the Study:

  • Investigate the structural, ferroelectric, and dielectric property changes in BST under high pressure.
  • Elucidate the underlying physical mechanisms governing BST's response to pressure.

Main Methods:

  • In situ synchrotron X-ray diffraction and Raman spectroscopy for structural analysis.
  • AC impedance spectroscopy and ferroelectric hysteresis loop measurements for electrical properties.
  • First-principles density functional theory (DFT) calculations for theoretical insights.

Main Results:

  • BST undergoes a tetragonal-to-cubic phase transition between 10-18 GPa, coinciding with ferroelectric-to-paraelectric transition.
  • High pressure suppresses Ti4+ off-center displacement, reducing spontaneous polarization and permittivity.
  • Dielectric loss increases due to enhanced electronic conduction in the paraelectric phase, confirmed by DFT-predicted band gap narrowing.

Conclusions:

  • Established a clear pressure-driven structure-property correlation in BST.
  • Deepened understanding of high-pressure mechanisms in perovskite ferroelectrics.
  • Provided insights for developing pressure-tolerant ferroelectric devices.