  We have investigated the phase transition and disoriented chiral condensate
domain formation in linear sigma model. Solving the equation of motion for the
sigma model fields in contact with a heat bath, we have shown that the fields
undergo phase transition above a certain critical temperature(T_c). It was also
shown that when the fields thermalised at temperature above T_c are cooled down
sufficiently rapidly, disoriented chiral condensate domains are formed quite
late in the evolution.
