Temperature Sensitive Spinel-Type Ceramics in Thick-Film Multilayer Performance for Environment Sensors

摘要

Temperature sensitive thick films based on spinel-type semiconducting ceramics of different chemical composition Cuo.1Ni_(0.1)Co_(1.6)Mn_(1.2)O_4 (with p~+-types of electrical conductivity), Cu_(0.1)Ni_(0.8)Co_(0.2)Mn_(1.9)O_4 (with p-types of electrical conductivity) and their multilayer p~+-p structures were fabricated and studied. These thick-film elements possess good electrophysical characteristics before and after long-term ageing test at 170 ℃. It is shown that degradation processes connected with diffusion of metallic Ag into film grain boundaries occur in one-layer p- and p~+-conductive thick films. The p~+-p structures were of high stability, the relative electrical drift was not greater than 1%.