Exchange coupling in transition metal intermetallics

N.H. Due, Intersublattice exchange coupling in the lanthanide-transition metal intermetallics 339... 

The simplest analytic model for an isolated proton in a lattice assumes that it is situated in a potential well centred on an interstitial site. This model is particularly appropriate to protons in a transition metal lattice, where the electron from the hydrogen atom can be accommodated in the d-band of the metal, but is also applicable to many other cases as well - e.g. to molecular hydrogen trapped in ion-exchanged zeolites (see Section 6.8.2 below). The model assumes that there are no interactions between neighbouring hydrogen atoms and that there is little coupling with the lattice modes. This implies that M/wjp 1 where m is the mass of the proton and M is the mass of the lattice atom. In transition metals, with face-centred cubic (FCC), body-centred cubic (BCC) or hexagonal close packed (HCP) lattices, the proton normally sits on either octahedral or tetrahedral sites. In more complex intermetallic... 

INTERSUBLATTICE EXCHANGE COUPLING IN THE LANTHANIDE-TRANSITION METAL INTERMETALLICS... 

Curie temperature (in K), compensation temperature T. (in K) and the exchange-coupling parameter Hrt (10 J) for a number of lanthanide-transition-metal intermetallics... 

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