REDUCED DIFFUSION OF A MOBILE ION FROM A METAL OXIDE CERAMIC INTO THE SUBSTRATE

摘要

A scavenger layer is provided to prevent the diffusion of an excess mobile specie form a metal oxide ceramic such as strontium bismuth tantalate (SBT) into unwanted parts of a device. The scavenger layer such as Ti or a transition metal on an oxide thereof is provided above the metal oxide ceramic. As the excess mobile specie diffuses out of the metal oxide ceramic, it migrates toward the scavenger layer and reacts with it. The reaction consumes the excess mobile specie.