| 摘要 |
Between insulative layers (31-37, 41-44), a multilayer substrate comprises at least one dielectric layer (26-29). It is possible to form capacitors (58), resistors (46), and wiring conductors (61, 62) in the substrate. The at least one dielectric layer should be of at least one dielectric composition which has a perovskite structure. Preferably, each insulative layer is of an insulating material which consists essentially of aluminum oxide and lead borosilicate glass. The substrate is convenient in manufacturing a crystal oscillator by mounting a crystal vibrator (71) and a transistor (72) on the principal surface(s). Examples of the dielectric composition are: Pb[(Fe2/3.W1/3)0.33(Fe1/2.Nb1/2)0.67]O3, Pb[(Mn1/3.Nb2/3)0.01(Mg1/2.W1/2)0.30(Ni1/3.Nb2/3)0.49Ti0.20]O3, and Pb[(Mg1/2.W1/2)0.66Ti0.34]O3. |
