A POSSIBLE NEW KIND OF GLASS STATE - PINNED-DOMAIN-WALL GLASS (PDWG)

The dielectric measurements at 1kHz indicated that the low temperature side of dielectric loss (D) peak goes to zero rapidly at about 250K i n TGS single crystal with the decreasing of temperature, which manifes ts the feature of phase transition. This behavior was not observed in LATGS singe crystal of monodomain. Therefore, the anomaly in TGS is cl osely related to the domain walls. To explain this anomaly, a possible new kind of glass: Pinned-Domain-Wall glass (PDWG) is introduced whic h is similar to pinned-vortex glass, and the point at which the dielec tric loss (D) goes to zero is defined as glass transition point (Tg). The experimental results was explained based upon the model.