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Crystal Field Theory - Octahedral Complexes02:58

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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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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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Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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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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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
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Crystal and magnetic structures of hexagonal YMnO3.

Christopher J Howard1, Branton J Campbell, Harold T Stokes

  • 1School of Engineering, University of Newcastle, Callaghan, NSW 2308, Australia.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|November 21, 2013
PubMed
Summary

This review details the structural and magnetic transitions in hexagonal YMnO3. It transitions from paraelectric to ferrielectric at 1250 K, and to antiferromagnetic at 70 K.

Keywords:
magnetic structuremanganitemultiferroicphase transitions

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Crystallography

Background:

  • Multiferroic hexagonal YMnO3 exhibits complex structural and magnetic phase transitions.
  • Understanding these transitions is crucial for applications in advanced electronic devices.

Purpose of the Study:

  • To review and clarify the sequence of structural and magnetic transitions in hexagonal YMnO3.
  • To analyze the capabilities of experimental methods in distinguishing between possible phases.

Main Methods:

  • Utilized group theoretical ISOTROPY software suite for predicting crystal and magnetic structures.
  • Considered the effectiveness of neutron diffraction and other physical methods for phase identification.

Main Results:

  • Hexagonal YMnO3 is paraelectric (P63/mmc) at high temperatures.
  • A structural transition to a ferrielectric phase (P63cm) occurs at 1250 K, persisting to room temperature.
  • A magnetic transition to a triangular antiferromagnetic arrangement (likely P63'cm') happens at 70 K.

Conclusions:

  • The study provides a clear view of the transformation sequence in hexagonal YMnO3.
  • Highlights the unusual coupling between ferroelectric and magnetic domains and the giant magneto-elastic effect.