Dielectric Properties of La2O3 Doped Composite (PbxSr1−x)‎TiO3 Borosilicate Glass Ceramic

الملخص EN

Ferroelectric (PbxSr1−x)TiO3 (PST) perovskite phase has been crystallized in borosilicate glassy matrix with a suitable choice of composition and heat treatment schedule.

La2O3 is a donor dopant for PST and can make it semiconducting.

Dispersion of semiconducting perovskite phase in insulating glassy matrix in glass-ceramic samples may lead to the formation of space charge polarization around crystal-glass interface, leading to a high value of effective dielectric constant, εr.

Therefore, with the aim of the developing glass ceramics with high dielectric constant, glasses in the system 64[(PbxSr1−x)O·TiO2]-25[2SiO2·B2O3]-5[K2O]-5[BaO]-1[La2O3] have been prepared (0.5≤x≤1).

It is found that the addition of La2O3 strongly affected the crystallization and dielectric behavior of glass-ceramic with PST perovskite phase.

All glass ceramic samples show a diffuse broad Curie peak in their εr versus T plots.

Curie peak temperature, Tc, depends on compositions of the glass-ceramic samples as well as frequency of measurements.