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Related Concept Videos

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...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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...
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,...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Lattice Energies of Ionic Crystals01:27

Lattice Energies of Ionic Crystals

Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
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...

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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Crystal-field level inversion in lightly Mn-doped Sr3Ru2O7.

M A Hossain1, Z Hu, M W Haverkort

  • 1Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.

Physical Review Letters
|September 4, 2008
PubMed
Summary
This summary is machine-generated.

Manganese (Mn) impurities in Sr3(Ru(1-x)Mnx)2O7 adopt a 3+ valence, altering electron orbital occupation. This leads to a crystal-field level inversion, driving the material into an antiferromagnetic state.

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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

Published on: May 10, 2021

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Strontium ruthenates (Sr3Ru2O7) are correlated electron systems exhibiting diverse electronic phases.
  • Substitution of Ru with Mn introduces localized 3d electrons, potentially altering the material's magnetic and electronic properties.

Purpose of the Study:

  • To investigate the electronic and magnetic behavior of Sr3(Ru(1-x)Mnx)2O7.
  • To understand the role of manganese (Mn) impurities in the electronic structure and phase transitions of this material.

Main Methods:

  • X-ray dichroism spectroscopy to probe element-specific electronic states.
  • Spin-resolved density functional theory (DFT) calculations to model the electronic structure.

Main Results:

  • Manganese (Mn) impurities were found to have a 3+ valence, acting as electron acceptors, rather than the expected 4+ valence.
  • The extra eg electron in Mn impurities occupies the in-plane 3d(x2-y2) orbital, deviating from the expected out-of-plane 3d(3z2-r2) occupation.
  • Evidence suggests a 3d-4d electronic interplay mediated by oxygen ligands, causing crystal-field level inversion.

Conclusions:

  • The observed crystal-field level inversion is attributed to the interplay between Mn 3d and Ru 4d orbitals.
  • This electronic modification drives the material into an antiferromagnetic and potentially orbitally ordered low-temperature state.