Insulating ceramic, multilayer ceramic substrate, ceramic electronic parts and laminated ceramic electronic parts

摘要

An insulating ceramic includes a fired mixture of a MgO-MgAl2O4 ceramic and a borosilicate glass, in which MgAl2O4 crystal phase and at least one of Mg3B2O6 crystal phase and Mg2B2O5 crystal phase are the major crystal phases. The insulating ceramic can be obtained by firing at low temperatures of 1000° C. or less, can be fired in conjunction with Ag or Cu, has a high Q-value and satisfactory mechanical strength, and is suitable for use at high frequencies.