Magnetization compounds

Crystal distortion in magnetic compounds. J. Appl. Phys. 31, 14 (1960). 

A somewhat different interpretation has been given by Johansson who applied the Mott-Hubbard theory of localized versus itinerant electron behaviour also to compounds. This interpretation differs from the above one mainly in that it assumes complete localization for magnetic compounds, and that at a certain critical inter-atomic distance we have to switch our description from a metallic state to an insulating one for the 5 f electrons (see Eq. (42)). In Eq. (42), an is substituted by a convenient measure of the spatial extension of the 5 f orbital, the expectation values (analogous to (of Fig. 10) and Xmoh is calculated from the R j radii of actinide metals (Fig. 3). The result is given in Table 6. 

From band structure calculations as well as from experimental results (photoemission, specific heat...), it is now clear that, at least for magnetic compounds near the critical spacing, 5 f electrons are in bands. This means that contrary to the pure metals, the Stoner criterion may be fulfilled before the band description breaks down. 

In a magnetic compound we have to consider exchange interactions in the molecular field approximation, the Curie law takes the Curie Weiss form... 

RARE-EARTH SPECTROSCOPIC PROBE IN A MAGNETIC COMPOUNDS... 

Abstract The magnetic compound CUB2O4 exhibits successive phase transitions. 

To date there has been no report of observation of magnetic order of 4/ metal phthalocyanines in solid state. However, in 2003, it was revealed that some of lanthanide phthalocyanine complexes exhibit an intriguing property as SMM, a relatively new class of magnetic compounds [29,30], The SMMs are the paramagnetic... 

Table A.l Intrinsic properties of some magnetic compounds. Note that y-Fe203 crystallizes in a disordered spinel structure...

Samarium looks and behaves like most other metals, but it has relatively few uses. One of the most important is in the manufacture of very powerful magnets. Compounds of samarium are also used to color glass and in television tubes. 

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