  Neutron diffraction studies as a function of temperature on solid solutions
of MnSe and MnTe in the Se rich region are presented. Interestingly as Te is
doped in MnSe, the structural transformation to NiAs phase diminishes, both in
terms of \% fraction of compound as well as in terms of transition temperature.
In MnTe$_{0.3}$Se$_{0.7}$, the NaCl to NiAs phase transformation occurs at
about 40K and although it is present at room temperature in
MnTe$_{0.5}$Se$_{0.5}$, its volume fraction is only about 10\% of the total
volume of sample. The magnetic ordering temperature of the cubic phase
decreases with increasing Te content while the hexagonal phase orders at the
same temperature as in MnSe. Anomalies in thermal evolution of lattice
parameters at magnetic ordering as well as structural transition temperatures
indicate presence of magnetostructural coupling in these compounds.
