Atmosphere control of interface migration and its effect on dielectric property of CuO-infiltrated strontium titanate

Abstract

The control of interface migration and its effect on dielectric properties of SrTiO3 based materials have been investigated, SrTiO3 specimens with or without Nb2O5 doping mere prepared, and the atmospheres of sintering and heat treatment mere varied during the processing, It has been demonstrated that the change in defect structure at the interface of Nb-doped SrTiO3 grains by atmosphere change was the cause of interface migration observed during CuO infiltration or heat treatment, The interface migration caused by sintering in a reducing atmosphere and infiltration in air could be suppressed by preoxidizing grain interfaces before the CuO infiltration in air. The suppression of migration increased the effective dielectric constant of the material.