Pyroelectricity of Ni-doped PMNT Ferroelectric for Pyroelectric Detector

A pyroelctric properties of Ni(x)-doped PMNT systems were analyzed. Modified PMNT samples were prepared using the columbite structure method. Pyroelectric current, polarization, dielectric constant and dissipation factor of Ni-doped PMNT samples were measured as a function of temperature. By adding a small amount of NiO, pyroelectricity of PMNT is increased. Unlike the normal ABO(3) ferroelectric, Ni-doped PMNT showed properties for relaxor ferroelectric of causing the successive phase transition over a wide temperature. The optimum conditions for obtaining compositions with improvement ferroelectric properties are a nominal addition of 0.02 mole% Ni. Also, Nidoped PMNT ferroelectric showed excellent pyroelectric figures of merit in the vicinity of room temperature. The pyroelectric coefficient (0.00524 C/m(2) K at 25 degrees C) and figures of merit (F-v similar to 0.039 m(2)/C and F-d similar to 0.664x10(-4) Pa-1/2) of composition PMNT with 0.02 mole% Ni are comparable to the earlier reports on lead-type pyroelectrics.