Diffuse phase transition from the superionic to non-superionic state in Cu_(1.8)Se single crystal

摘要

The phase transition from the superionic to non-superionic state in a Cu_(1.8)Se single crystal is studied by neutron diffraction. In the superionic state, a diffuse halo related to the disordering of the cation subsystem is observed. It is established that the phase transition from the superionic to non-superionic state is the diffuse first-order phase transition occurring in the temperature range 250-180 K.