Abstract

The addition of Sn to the preparation of MgB 2 led to the formation of Mg 2Sn. Both Co and Fe were to some extent incorporated into the MgB 2 lattice. Small amounts of Co or Fe decreased the T c(0)-values but did not destroy the superconducting behavior of MgB 2. Larger amounts of Co produced amorphous material and CoB. Fe 2B was found at higher Fe contents as a secondary phase.

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