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Related Concept Videos

Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
Ferromagnetism01:31

Ferromagnetism

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...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
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,...
Valence Bond Theory02:42

Valence Bond Theory

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...
Colors and Magnetism03:02

Colors and Magnetism

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 eye.

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Anisotropic paramagnetism of monoclinic Nd2Ti2O7 single crystals.

Hui Xing1, Gen Long, Hanjie Guo

  • 1Department of Physics and State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 12, 2011
PubMed
Summary

Investigating anisotropic paramagnetism in Neodymium Titanate (Nd2Ti2O7) single crystals reveals dominant crystal field effects and ferromagnetic exchange interactions. Specific heat measurements determined ground state g-factors, aiding future research.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Neodymium Titanate (Nd2Ti2O7) is a pyrochlore material with potential magnetic applications.
  • Understanding its magnetic properties, such as anisotropic paramagnetism, is crucial for materials science.
  • Crystal field and exchange interactions significantly influence magnetic behavior in rare-earth compounds.

Purpose of the Study:

  • To investigate the anisotropic paramagnetism and specific heat of Nd2Ti2O7 single crystals.
  • To elucidate the roles of crystal field and exchange interactions in the material's magnetic properties.
  • To determine the g-factors of the ground state doublet through specific heat measurements.

Main Methods:

  • Anisotropic magnetization and specific heat measurements were performed on Nd2Ti2O7 single crystals.
  • Analysis of angular dependence of magnetization and Weiss temperatures.
  • Incorporation of data from diluted samples to isolate interaction contributions.
  • Magnetic field-dependent specific heat measurements to identify Schottky anomalies.

Main Results:

  • The crystal field effect plays a dominant role in the magnetization of Nd2Ti2O7.
  • Exchange interactions were identified as ferromagnetic.
  • Crystal fields contribute a significant negative value to the Weiss temperature in all crystallographic directions.
  • A two-level Schottky ground state scheme was observed, allowing for the determination of g-factors.

Conclusions:

  • The study clarifies the interplay between crystal field and exchange interactions in Nd2Ti2O7.
  • Determined g-factors provide essential parameters for theoretical modeling and device design.
  • These findings establish a strong foundation for future research on Nd2Ti2O7 and related materials.