| 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(Mg1/3 Nb2/3)O3-PbTiO3-Pb(Ni1/2W1/2)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 pentagonal range having compsn. points A-E as vertexes corresponding to variables a, b in the triangular coordinates having Pba(MgbNb2/3)Oa+b+5/3, PbaTia+2 and Pba(Ni1/2W1/2)Oa+2 as vertexes. The points A-E (x, y, z) are A (0.950, 0.049, 0.001), B (0.750, 0.249, 0.001), C (0.010, 0.800, 0.190), D (0.010, 0.450, 0.540) and E (0.900, 0.050, 0.050). |
