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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 - 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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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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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.
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Updated: Sep 13, 2025

Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
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Yttrium: A Highly Efficient Dopant for Ferroelectric HfO2.

Mehrdad Ghiasabadi Farahani1, César Magén2, Alberto Quintana1

  • 1Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Spain.

ACS Applied Electronic Materials
|July 31, 2025
PubMed
Summary

Yttrium doping stabilizes ferroelectricity in thick hafnium oxide (HfO2) films, overcoming typical thickness limitations. This finding supports Yttrium

Keywords:
dopingepitaxial HfO2ferroelectric HfO2ferroelectric oxidesyttrium

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Thin Film Technology

Background:

  • Ferroelectricity in hafnium oxide (HfO2) thin films is metastable.
  • Stabilization depends heavily on doping and microstructure.
  • Ferroelectric polarization typically decreases with increasing film thickness.

Purpose of the Study:

  • To investigate the role of Yttrium (Y) doping on the thickness-dependent ferroelectric properties of HfO2 films.
  • To understand the influence of microstructure on ferroelectric stability.
  • To identify effective dopants for robust ferroelectric HfO2.

Main Methods:

  • Preparation of Y-doped epitaxial HfO2 films of varying thicknesses (up to ~100 nm).
  • Phase evolution and ferroelectric polarization measurements.
  • Scanning Transmission Electron Microscopy (STEM) for microstructural analysis.

Main Results:

  • Robust ferroelectric response observed in Y-doped HfO2 films across all thicknesses.
  • Coexistence of monoclinic (paraelectric) and orthorhombic (ferroelectric) phases.
  • Columnar grain structure preserved beyond 10 nm, indicating microstructural stability.

Conclusions:

  • Yttrium is highly effective in stabilizing ferroelectricity in thick HfO2 films.
  • The observed columnar microstructure contributes to the robustness of ferroelectricity.
  • Y-doped HfO2 is suitable for devices requiring thick ferroelectric layers.