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Phase diagram for the 0.3Pb(Zn1/3Nb2/3)O3–0.7Pb0.96La0.04 (ZrTi)0.99O3 solid solution in the vicinity of morphotropic phase boundary

The dielectric behaviours of numerous specimens near the morphotropic phase boundary (MPB) of the 0.3Pb(Zn1/3Nb2/3)O3–0.7Pb0.96La0.04 (ZrxTi1 − x)0.99O3 (x = 0.50–0.53) relaxor ferroelectric system were measured. The results revealed that the poled specimens on the rhombohedral side underwent a rhombohedral–tetragonal transition on heating, and the depoled specimens on the tetragonal side experienced a spontaneous relaxor–normal transition on cooling. A phase diagram based on the dielectric permittivity measurements was proposed for this solid solution. The diagram showed that the polarization made the MPB bend sharply towards the rhombohedral-rich region. On the basis of these results in this and previous similar investigations, some common characteristics of complex relaxor ABO3 perovskite systems near the MPB were proposed.