The magnetic properties of La
2Co
17-x-yFe
xTi
y and La
2Co
17-x-yFe
xTi
yN
δintermetallic compounds have been investigated. La
2Co
17-x-yFe
xTi
y has the rhombohedral Th
2Zn
17 structure and exhibits magnetic properties as follows: saturation magnetization >1.0T, Curie temperature >873K and easy c-axis.
Nitrogen is introduced into these compounds interstitially through nitrogenation process. The saturation magnetization and Curie temperature of La
2Co
17-x-yFe
xTi
yN
δis decreased by introduction of nitrogen, on the contrary to Sm
2Fe
17.
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