Microstructure, morphology, and dielectric properties of in situ synthesized CCTO/CTO/TiO2 composite ceramics

Giant dielectric response and grain heterogeneity of Y2/3Cu3Ti4O12–TiO2 composite ceramics fabricated by hydrothermal process

“…In addition, excess TiO 2 can promote the electron hopping between Cu + /Cu 2+ and Ti 3+ /Ti 4+ ions in CCTO to enhance the grain semiconducting properties, ultimately leading to an increase in dielectric constant (see Table S1 for details). [27][28][29] Recent studies have shown that similar effects exist in some ACTO ceramics and affect their dielectric properties, such as Na 1/2 Y 1/2 Cu 3 Ti 4 O 12 system ceramics. 30,31 Whether the effect applies to other ACTO system ceramics is still unclear, especially the role of A-site vacancies in this process.…”

“…However, it is still unclear whether there are similar structures in other ACTO system ceramics and whether it motivates the heterogeneity of YCTO grains. In addition, excess TiO 2 can promote the electron hopping between Cu + /Cu 2+ and Ti 3+ /Ti 4+ ions in CCTO to enhance the grain semiconducting properties, ultimately leading to an increase in dielectric constant (see Table S1 for details) 27–29 . Recent studies have shown that similar effects exist in some ACTO ceramics and affect their dielectric properties, such as Na 1/2 Y 1/2 Cu 3 Ti 4 O 12 system ceramics 30,31 .…”