Structure and properties of some novel ternary Fe-rich rare-earth intermetallics (invited)

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Abstract
The structures and the magnetic properties of some novel ternary compounds were studied. These compounds have the approximate composition RFe10T2, where T represents Cr, V, Ti, Mo, W, or Si. The structure of all these compounds can be derived from the tetragonal ThMn12 structure type, but the crystallographic position occupied by the different T atoms is not the same. Most of the compounds have a homogeneity range represented by RFe12−xTx. This homogeneity range is fairly large in the case of T=V and strongly asymmetric for T=Ti and W. A structure determination is given for a representative member of the RFe10Si2 family. This structure determination is compared with results obtained previously for T=Mo and V, in which latter compounds the site occupancy of the T component is completely different from that in RFe10Si2. A survey is given of the magnetic and invar properties of RFe10T2 compounds. Special attention is paid to an analysis of the magnetocrystalline anisotropy in these materials.