Properties influencing magnetic behaviour

The aim of this chapter is to summarize the up-to-date knowledge derived mainly from the experimental investigations of electronic properties of actinide inter-metallic compounds, with a special emphasis on the magnetic behaviour. The general features and tendencies in the 5f-electron system are sketched in section 2, together with relevant information available from different bulk and microscopic experimental methods. Sections 3 and 4 review the properties of binary and ternary compounds, respectively. The influence of the incorporation of H and B in inter-metallic compounds is discussed in section 5. Amorphous and icosahedral com-... 

Magnetic properties describe the behaviour of a substance under the influence of a magnetic field. There are two main effects and phenomena ... 

Separation depends on the selection of a process in which the behaviour of the material is influenced to a very marked degree by some physical property. Thus, if a material is to be separated into various size fractions, a sieving method may be used because this process depends primarily on the size of the particles, though other physical properties such as the shape of the particles and their tendency to agglomerate may also be involved. Other methods of separation depend on the differences in the behaviour of the particles in a moving fluid, and in this case the size and the density of the particles are the most important factors and shape is of secondary importance. Other processes make use of differences in electrical or magnetic properties of the materials or in their surface properties. 

In subsection 4.1 we will consider the influence of crystalline electric fields on the magnetic properties and in the following subsections we will briefly report on the behaviour of the individual / Ni2B2C compounds from R = Ce to Yb. 

Solvent can affect the electronic structure of the solute and, hence, its magnetic properties either directly (e.g. favouring more polar resonance forms) or indirectly through geometry changes. Furthermore, it can influence the dynamical behaviour of the molecule for example, viscous and/or oriented solvents (such as liquid crystals) can strongly damp the rotational and vibrational motions of the radical. Static aspects will be treated in the following, whereas the last aspect will be tackled in the section devoted to all the dynamical effects. 

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