| 摘要 |
PURPOSE:To obtain a dielectric porcelain composition of high dielectric constant and high insulation resistance, being excellent in quality Q, and of small temperature coefficient of electrostatic capacity by making the composition contain a specific amount of niobium oxide as auxiliary component against main components that the composition contains in such a manner that when an expression is given as xBaO-yTiO2-z(Re(1-c)Mec)O3/2, (x),(y) and (z) are in a specific mole ratio range. CONSTITUTION:The dielectric porcelain composition is made to contain niobium oxide as auxiliary component by 0. 3 to 8.0 parts by weight in Nb2O5 against main components that the composition contains in such a manner that when an expression is given as xBaO-yTiO2-z(Re(1-c)Mec)O3/2) (x+y+z=1.00; 0.01<=C<=0.20; Re is at least more than one kind of rare earth element selected among La, Pr, Nd and Sm; Me is at least more than one kind of rare earth elements selected from a group which does not include La, Pr, Nd and Sm), (x), (y)and (z) are in a mole ratio range surrounded by points (a) to (f) in the figure. The composition thereby has its dielectric constant, insulation resistance, insulation breakdown voltage enhanced, its quality Q largely improved and its temperature coefficient of electrostatic capacity reduced. |
