| 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(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 and x+y+z=1) and consists of components within a pentagonal range having compsn. points A-E as vertexes corresponding to variable a in the triangular coordinates having Pba(Mgb-Nb2/3)Oa+b+5/3, PbaTiOa+2 and Pba(Mg1/2W1/2)Oa+2 as vertexes. The points A-E (x, y, z) are A (0.955, 0.044, 0.001), B (0.650, 0.349, 0.001), C (0.001, 0.800, 0.199), D (0.001, 0.300, 0.699) and E (0.400, 0.001, 0.599). |
