The role of hydrogen peroxide dipping in structural and electrical properties of calcium strontium titanate-based ceramics.

Hydrogen peroxide (H₂O₂, 30%) dipping treatment was conducted on Mn-doped Ca_0.6Sr_0.4TiO₃ (CST) in this research, to modify the concentration of oxygen vacancies in dielectric ceramics. Structure characterization, including XRD, SEM, IR, and XPS, indicated minimal effect of H₂O₂ dipping on phase structure and grain size, while revealed a chemical reaction between H₂O₂ and the surface of CST. Electrical properties of the grain region remained unchanged after treatment, while the grain boundary region was sensitive to H₂O₂ dipping, due to faster diffusion rate of oxygen vacancies in grain boundary region. In addition to that, the bulk insulating properties was found to be dominated by grain boundaries. [ABSTRACT FROM AUTHOR]