Influence of preparation of flourozirconated glasses on their electrical and dielectrical properties

Both the electrical and dielectrical properties of multicomponent flourozic onated glasses are usually sensitive to the thermal history of their prepar ation and to their content of impurities. A non-uniform distribution of the glass components could lead to the creation of clusters in the glass latti ce. These are the cause of phase separation, or in other words the inchoate centres of crystallization. It was found from measured temperature and fre quency dependences of both DC and AC conductivities and permitivity that th e content of OH- groups (more than 1 ppm) has a considerable effect on the properties associated with the glass structure. The presence of OH- groups can not only affect optical properties but they may also be the centres of recrystallization. The way the type of glasses free of OH- groups is prepar ed does not affect the electrical and dielectrical properties measured. The paper shows that the glasses are very stable up to temperatures of about 3 00 degrees C.