  We have systematically studied the magnetic properties of chromium chalcogene
compounds FeCr$_2$Se$_{4-x}$Te$_x$. The FeCr2Se4 undergoes antiferromagnetic
ordering below 222 K. Substitution of tellurium lowers the antiferromagnetic
ordering temperature and leads to short range ferromagnetic cluster behavior
towards the tellurium end. Change over from antiferromagnetic to ferrimagnetic
like behavior is also reflected in the corresponding transformation from
semiconducting to metallic transport behavior. There is a large variation in
the Curie-Weiss temperature, effective magnetic moment and ordering temperature
(TN / TC) with Te substitution. The electronic band structure calculations
suggest antiferromagnetic and ferrimagnetic ground state for the FeCr2Se4 and
FeCr2Te4 respectively.
