Composite function element and process for producing same.

摘要

This invention relates to a composite function element characterized by forming a high resistance thin film layer containing the constitutional elements of perovskite type oxide and speicfied impurity elements at the grain boundary of a sintered product which is an agglomerate of n type semiconductor particles, and to a process for producing said composite function element. Said composite function element has such a composite function that it acts as a varistor passing high voltages at a high voltage and as a capcitor passing the currents of abnormal frequency zone at a low voltage, so that the functions of the two elements, a varistor and a capacitor, can be fulfilled simultaneously with only one element. Therefore, its extensive application to the usage of, for example, prevention of erroneous work in microcomputer-controlled instruments can be expected.