Ceramics-Silikáty 43 (3) 107-110 (1999)

TRANSPORT PROPERTIES OF Ge-Ga-S GLASS DOPED BY PRASEODYMIUM

J. Kalužný D. Ležal, T. Kozík, M. Kubliha, E. Mariani 

The temperature dependencies of direct electrical conductivity and temperature and frequency dependencies of permittivity of prepared sulphide glasses doped by praseodymium ions (Ge25 Ga10-x Pr x S65, x = 1000 wt. ppm) were measured. The results indicate the existence of one conductivity mechanism with activation energy 0.91 eV up to the temperature 360 °C. The dependencies of electrical modulus M" versus M' as well as the frequency dependencies M" versus f show that the glass has monophase structure and is very homogeneous with the presence of only one relax time. The glass exhibits new relax time distribution indicating the formation of new structure when it was tempered up to 380 °C, that means just below T_g ~ 400 °C.

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