Dresden 2006 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.26: Poster

Montag, 27. März 2006, 09:30–17:00, P1

Dielectric properties of BT-LMT mixed ceramics — •Povilas Keburis¹, Juras Banys¹, Algirdas Brilingas¹, Andrei Salak², and Victor M. Ferreira³ — ¹Department of Radiophysics, Vilnius University, Lithuania — ²Department of Ceramics and Glass Engineering/CICECO, University of Aveiro, Portugal — ³Department of Civil Engineering/CICECO, University of Aveiro, 3810-193 Aveiro, Portugal

Ceramics of (1-x)BaTiO₃-xLa(Mg_1/2Ti_1/2)O₃ with x=0.025 (0.975BT-0.025LMT) were dielectrically investigated over the extended frequency range. Dielectric studies have been performed at 20 Hz to 3 GHz within the temperature interval of 100 K - 500 K. Apparent relaxor behaviour was revealed to set in when the BT-type three phase transitions become diffuse and merge at low temperatures. Maximums of both imaginary and real parts of the dielectric permittivity are shifted to lower temperatures comparing to pure BT and in the temperature ranges close to phase transitions show strong frequency-dependent behaviour, typical for relaxors. Dynamics of the phase transitions are discussed.