Ceramics-Silikáty 42, (3) 125 - 129 (1998) |
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INFLUENCE OF PREPARATION OF FLOUROZIRCONATED GLASSES ON THEIR ELECTRICAL AND DIELECTRICAL PROPERTIES
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Kalužný Ján 1, Ležal Dmitrij 2, Mariani Emil 1
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1 Department of Physics, Faculty of Materials Science and Technology,
Paulínska 16, 917 24 Trnava, Slovak Republic
2 Laboratory of Inorganic Materials,
Academy of Sciences of the Czech Republic and Institute of Chemical Technology
Pelleova 24, 160 01 Prague
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Both the electrical and dielectrical properties of multicomponent flouroziconated glasses are usually sensitive to the thermal history of their preparation and to their content of impurities. A non-uniform distribution of the glass components could lead to the creation of clusters in the glass lattice. These are the cause of phase separation, or in other words the inchoate centres of crystallization. It was found from measured temperature and frequency dependences of both DC and AC conductivities and permitivity that the 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 prepared does not affect the electrical and dielectrical properties measured. The paper shows that the glasses are very stable up to temperatures of about 300 °C. |
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