EVIDENCES OF A STRUCTURAL PHASE TRANSITION IN THE NEW Pb(ZryTi1 - y)O3 MODIFIED TELLURITE GLASS-CERAMIC COMPOSITE

The physical properties of the new TeO2 – B2O3 – PbO2 (TBP)-based glass system, obtained from the usual melt-quench method, have been investigated taking into account the influence of the Pb(ZryTi1 - y)O3 (PZT) ferroelectric system. A crystalline-like structure, which characterizes a glass-ceramic-like state, promoted by the ferroelectric phase, has been revealed from the X-ray diffraction results for the sample with higher PZT concentration. On the other hand, results on the dielectric response revealed noticeable dielectric anomalies, which until now have not been reported. In fact, the dielectric and ferroelectric properties suggest the existence of a structural phase transition induced by the PZT crystalline phase, which indeed have been related to the ferroelectric polar-phase regions embedded into the glass matrix.