| 摘要 |
PURPOSE:To enable the maintenance of high resistance even by calcining in an atmosphere under a low partial pressure of oxygen by substituting Mg for part of Nb, W or Ti in compound perovskite represented by a formula Pb(Ni1/3 Nb2/3)O3-PbTiO3-Pb(Mg1/2W1/2)O3 so as to obtain a specified compsn. CONSTITUTION:This ceramic compsn. having a high dielectric constant is represented by the general formula (where 0.95<=a<=1.2, 0.334<=b<=1.0 and x+y+z=1) and consists of components within a tetragonal range having compsn. points A-D as vertexes corresponding to variables a, b in the triangular coordinates having Pba(Ni1/3Nb2/3)Oa+2, PbaTiOa+2 and Pba(MgbW1/2)Oa+b+3/2 as vertexes. The points A-D (x, y, z) are A (0.850, 0.149, 0.001), B (0.450, 0.549, 0.001), C (0.001, 0.800, 0.199) and D (0.010, 0.340, 0.650). |
