Insulating ceramic composition, insulating ceramic sintered body, and multilayer ceramic electronic component

摘要

An insulating ceramic composition forming insulating ceramic layers ( 3 ) stacked in a multilayer ceramic substrate ( 2 ) used in a monolithic ceramic electronic component, such as a multilayer ceramic module ( 1 ). The insulating ceramic composition contains a first ceramic powder mainly containing forsterite, a second ceramic powder mainly containing at least one compound selected from the group consisting of CaTiO₃, SrTiO₃, and TiO₂, and a borosilicate glass powder. The borosilicate glass powder contains 3 to 15 percent by weight of lithium in terms of Li₂O, 30 to 50 percent by weight of magnesium in terms of MgO, 15 to 30 percent by weight of boron in terms of B₂O₃, 10 to 35 percent by weight of silicon in terms of SiO₂, 6 to 20 percent by weight of zinc in terms of ZnO, and 0 to 15 percent by weight of aluminum in terms of Al₂O₃. The insulating ceramic composition can be fired at a temperature of 1000° C. or less, and the resulting sintered compact has a low relative dielectric constant, a resonance frequency with a low temperature coefficient, and a high Q value.