On the tricritical point on the (p,T)-phase diagram of Sn2P2S6 crystals |
| |
Authors: | I Martynyuk-Lototska A Say O Mys |
| |
Institution: | Institute of Physical Optics , 23 Dragomanov St., 79005 Lviv , Ukraine |
| |
Abstract: | Using studies of the temperature dependence of the acoustic wave velocity at high hydrostatic pressures, a tricritical point where second-order phase transitions change to first-order ones was experimentally revealed on the pressure–temperature phase diagram of Sn2P2S6 crystals. The behavior of the acoustic wave velocity is explained in the framework of mean-field theory. |
| |
Keywords: | ferroelectric Lifshitz point tricritical point acoustic wave velocity |
|