| 摘要 |
PURPOSE:To improve a dielectric constant, insulation resistance and dielectric breakdown voltage and decrease the temperature coefficient of electrostatic capacity by composing prescribed three kinds of material in a prescribed molar ratio, respectively. CONSTITUTION:The main components of a composition are defined as being within mole ratios surrounded by a, b, c, d, e and f in a ternary diagram of three materials. The three materials are defined as (BaO)(1-m)(SrO)m, TiO2 and BeO3/2, and composed in mole ratios of x, y and z, respectively; where 0.01<m<=0.30, Re is one or more kinds of rare earth elements selected from La, Pr, Nd and Sm. The a, b, etc., expressing a composition range are defined as values expressed corresponding to x, y and z; and x+y+z=1.00 is satisfied. The respective ranges A, B, C, D and E in the ternary diagram do not satisfy required performances, so that they are excluded. |
