Peculiarities of the pyroelectric effect and of the dielectric properties in Bi-doped Pb(Zr0.95Ti0.05)O3 ceramics

Unusual behaviour of the pyroelectric effect and some peculiarities of the dielectric characteristics in the vicinity of AFE↔FE phase transitions in Bi-doped Pb(Zr0.95Ti0.05)O3 ceramics are confirmed. Two pyroelectric peaks are found both on heating and cooling through this phase transition. They occur at temperatures, which depend on the strength of the DC field, and on other conditions of the pre-poling procedure. The internal bias electric field associated with the metastable space charge polarisation is considered to be the reason for the observed peculiarities in the pyroelectric effect and dielectric properties.