(Pb,Ca)[(Co_<1/2>W_<1/2>)Ti]O_3セラミックスの焦電特性

概要

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The pyroelectric properties of (Pb_<1-x>, Ca_x) [(Co_<1/2>W_<1/2>)Ti]O_3 ceramics have been studied by substituting Ca for Pb and by measuring spontaneous polarization using the Sawyer-Tower method in order to clarify the mechanism responsible for the improvement of pyroelectric property. With an increase in the Ca concentration range of x = 0.20-0.30, spontaneous polarization, P_s increases and reaches large values of 40-42 μC/cm^2 at 100℃, as compared to the 2-3.5 μC/cm^2 of the representative PbTiO_3 ceramics containing small amounts of La and Mn. The Curie temperature decreases according to the Vegard law. The coercive electric field E_c markedly decreases from 28 kV/cm at a Ca concentration of x=0.10 to 4kV/cm at a Ca concentration of x= 0.40, compared with the 60 kV/cm of PbTiO_3 ceramics. Increasing spontaneous polarization might be explained in terms of lattice distortion by Ca ions. It is found that a significant improvement of pyroelectric properties is related to an increase in spontaneous polarization P_s and a decrease in the Curie temperature.
社団法人日本セラミックス協会の論文
2002-07-01