Microstructure, morphology, and dielectric properties of in situ synthesized CCTO/CTO/TiO composite ceramics
Journal of Materials Science: Materials in Electronics, ISSN: 1573-482X, Vol: 33, Issue: 4, Page: 1807-1816
2022
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Article Description
CaCuTiO/CaTiO/TiO (CCTO/CTO/TiO) composite ceramics were fabricated by an in situ route and sintered at 1040 °C for 8 h. The micrographs of FESEM show that the ceramics are dense and delicate, with an average particle size of about 0.9–1.4 μm. XPS found the existence of Cu and Ti, which was caused by the charge compensation reaction derived from part of Ti ions entering the V″ to form the donor Ti··Cu. The impedance analysis shows that excessive CTO and TiO significantly reduce the grain boundary resistance of CCTO/CTO/TiO ceramics. Furthermore, it can be found that due to excessive CTO, TiO reacts with segregated CuO to form CCTO again and reduce the CuO concentration at the grain boundaries. Therefore, this significantly reduces the grain boundary width, resulting in a colossal dielectric constant of 9.0 × 10 at 30 Hz.
Bibliographic Details
Springer Science and Business Media LLC
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