Dielectric and pyroelectric properties of a ceramic bimorph structure

In this paper, pyroelectric and dielectric properties of a composite structure, with 2–2 connectivity, are studied. The originality consist in the fact that the two phases of the composite are pyroelectric ceramics with different Curie temperature. This structure, called pyroelectric bimorph, shows some interesting properties such as: apparent displacement of the Curie points of the two phases, enhanced pyroelectric coefficient (5.4 × 14−4 C/m2K for a series bimorph, which is greater than the pyroelectric coefficients of each of the two component phases) and others. The appearance of an electric field, during heating, is put into evidence. The behavior of the bimorph depends strongly on the rapport of the electrical time constants, τ = RC, of the two component phases.