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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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Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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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.
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Magnetic Declination01:19

Magnetic Declination

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Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers:  n, l, ml, and...
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Paramagnetism

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Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging
11:27

Preparation and In Vitro Characterization of Dendrimer-based Contrast Agents for Magnetic Resonance Imaging

Published on: December 4, 2016

Magnetic ordering in GdAgSb2.

D H Ryan1, N R Lee-Hone, J M Cadogan

  • 1Physics Department and Centre for the Physics of Materials, McGill University, Montreal, H3A 2T8, Canada.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 23, 2011
PubMed
Summary
This summary is machine-generated.

Gadolinium silver antimonide (GdAgSb(2)) exhibits antiferromagnetic order below 13.8 K. Neutron diffraction reveals Gd magnetic moments lie in the ab-plane with a specific propagation vector.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Gadolinium silver antimonide (GdAgSb(2)) is an intermetallic compound.
  • Understanding its magnetic properties is crucial for exploring novel magnetic materials.

Purpose of the Study:

  • To investigate the magnetic ordering of GdAgSb(2) using advanced spectroscopic and diffraction techniques.
  • To determine the magnetic structure and properties of GdAgSb(2) at low temperatures.

Main Methods:

  • (155)Gd Mössbauer spectroscopy was employed to probe the magnetic environment of Gd ions.
  • Neutron powder diffraction was utilized to determine the crystallographic and magnetic structure.

Main Results:

  • Commensurate antiferromagnetic order was observed below a critical temperature (T(N)) of 13.8(4) K.
  • The Gadolinium (Gd) magnetic moments, with a magnitude of 6.2(3) Bohr magnetons (μ(B)), align within the ab-plane of the tetragonal unit cell.
  • The magnetic structure is characterized by a [½ 0 0] propagation vector, indicating a doubling of the magnetic unit cell along a basal plane axis.

Conclusions:

  • The magnetic ordering in GdAgSb(2) is well-defined and characterized by specific moment orientations and a propagation vector.
  • The findings are consistent with previous studies using X-ray resonant magnetic exchange scattering, confirming the magnetic structure.