Diamagnetic


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diamagnetic

[¦dī·ə·mag′ned·ik]
(electromagnetism)
Having a magnetic permeability less than 1; materials with this property are repelled by a magnet and tend to position themselves at right angles to magnetic lines of force.

Diamagnetic

 

a substance that becomes magnetized against the direction of an external magnetic field. In the absence of an external magnetic field a diamagnetic is nonmagnetic. Upon exposure to an external magnetic field each atom of a diamagnetic acquires a magnetic moment j (each mole of the substance acquires a total moment J) proportional to the field intensity H and directed against the field. Therefore, the magnetic susceptibility x = J/H is always negative for diamagnetics. The diamagnetic susceptibility χ is small with respect to absolute magnitude and is weakly dependent on both the magnetic field intensity and the temperature (seeTable 1, where xis the susceptibility of 1 mole).

Table 1. Magnetic susceptibility of certain diamagnetics (under normal conditions)
 X x 10-6
Nitrogen (N2)...............-12.0
Hydrogen (H2)...............-4.0
Germanium (Ge)...............-7.7
Silicon (Si)...............-3.1
Water, liquid (H2O)...............-13.0
Table salt (NaCI)...............-30.3
Acetone (C3H6O)...............-33.8
Glycerol (C3H8O3)...............-57.1
Naphthalene (C12H8)...............-91.8(avg.)

Diamagnetics include silicon, phosphurus, bismuth, zinc, copper, gold, silver, the inert gases, nitrogen, and hydrogen. Many organic and inorganic compounds are diamagnetic.

References in periodicals archive ?
Here, we're using the diamagnetic force to balance gravity instead of centrifugal force.
Generally, square planar Ni(II) complexes are diamagnetic while tetrahedral complexes have moments in the range 3.
WUNNER, Classical and quantal chaos in the diamagnetic Kepler problem, Prog.
The alternating sense of the paramagnetic shift between the 2'- and 3'-position protons (upfield and downfield of the corresponding signals of the diamagnetic free ligand, respectively) is consistent with a dominant [pi] delocalization mechanism, as expected for a [t.
When exposed to a magnetic field, particles will exhibit a specific response that classifies them in one of three groups: ferromagnetic, paramagnetic, or diamagnetic.
Many measurements were recorded including multi-cord x-ray spectroscopy that measures the energetic electron temperature profile, arrays of magnetic flux loops and sensors that measure the pressure-driven diamagnetic currents, visible video photography that measures the evolution of the plasma structure, microwave interferometry that measures plasma density, and electrostatic probes inserted to measure the parameters of the edge plasma.
As the cuvettes and cotton wool were diamagnetic, appropriate blank measurements were made and the [chi] values adjusted.
These so-called diamagnetic materials have no permanent magnetic character but generate magnetism that opposes an applied magnetic field.
is averted with an unmistakable almost diamagnetic force
At ambient temperatures the compounds are essentially diamagnetic, with low residual magnetism arising from defects.
Samples of both these materials have shown diamagnetic behaviour.
DPPH accepts electron or hydrogen radical from antioxidant molecule to become a stable diamagnetic molecule, which is confirmed by decrease in absorbance at 517nm.