Permanent magnet properties of Sm2(Co,Fe)17

Criteria governing the successful application of RE
2
T
17
compounds in permanent magnet production are suggested, based upon the experience gained with RECo
⁵
materials. The implications of these criteria to both alloy composition and production techniques are illustrated for Sm
2
(CO
1-x
Fe
x
)
17
. In this respect the primary magnetic properties of these compounds, derived from single crystal measurements, are presented. The results of initial attempts to produce hard magnetic materials from certain of these materials are reported and analysed in order to identify the major problems still to be overcome.