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Study of Leucite-type Glass-ceramics by Thermally Stimulated Depolarization Current

Mladen Topić ; Divison of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia
Svetozar Musić ; Divison of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia
Mira Ristić ; Divison of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia
Jasenka Živko-Babić ; School of Dental Medicine, University of Zagreb, HR-10002 Zagreb, Croatia

Sažetak

Two different ingots of leucite-type glass-ceramics were studied by integral and by partial thermally stimulated depolarization current (TSDC) in the range from 173 to 370 K. Partial measurements showed distributed dipolar relaxation (P₁) with a maximum at 256 K, caused by the interaction between alkali ions and nonbridging oxygen atoms. The following relaxation, observed at a higher temperature (P₂), was attributed to the decay of the space charge dipoles. Only the beginning of P₂ was studied because the development of the process was overlapped by the conductivity current. Addition of different oxides to the original material decreased the P₁ and increased the P₂ relaxation, due to the increase of the interface area.

Ključne riječi

leucite; glass-ceramics; thermally stimulated current; TSDC

Hrčak ID:

131788

URI

https://hrcak.srce.hr/131788

Datum izdavanja:

1.2.2001.

Posjeta: 1.235 *