Thermal dependence of pyroelectric parameters of PZT-based multi-component electroceramics

Five-component electroceramics based on solid solution PbTiO3–PbZrO3–PbNb2/3Zn1/3O3–PbSb2/3Mn1/3O3–PbNb2/3Mn1/3O3 was studied. The chemical composition of the solid solution varied with PbTiO3 content. Thus samples exhibiting rhombohedral crystalline structure, tetragonal structure, as well as samples exhibiting compositions from the morphotropic phase boundary region (MBR) were under investigation. Conventional mixed oxide method was used for the powder preparation. Hot pressing technique was employed for fabrication of ceramic pellets. To produce pyroelectric activity the samples underwent high voltage poling (HVP) or low voltage poling (LVP). Thermal stability of the pyroelectric coefficient was measured according to both quasi-static γST(T) and dynamic method γD(T). The customised measuring system was developed. Dependence of the dielectric permittivity ε33/ε0 of poled samples on temperature was also recorded. Results are reported and explanation of the observed temperature traces for γST(T), γD(T), and ε33/ε0(T) is given taking into consideration the two different methods of poling the multi-component samples.