Role of oxygen on the phase stability and microstructure evolution of CaCu3Ti4O12 ceramics

Journal of the European Ceramic Society Volume: 37 Issue: 1 Pages: 129-136 Published: 2017

BSE-SEM images of CCTO10 (a) as-polished and after thermal etching at (b) 975◦C, (c) 1000◦C, and (d) 1050◦C for 20 min. Left insets: High magnification of the grainboundary regions.

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Writers: Anderson A. Felix and Vinícius D.N. Bezzon and Marcelo O. Orlandi and Damjan Vengust and Matjaž Spreitzer and Elson Longo and Danilo Suvorov and José A. Varela

Keywords: CaCu3Ti4O12; Oxygen partial pressure; Phase stability; Non-stoichiometry; Grain growth

Abstract: Phase stability and microstructure evolution of polycrystalline CaCu3Ti4O12 (CCTO) ceramics were studied by controlling the partial pressure of (from a poor to an oxygen rich atmosphere) during the sintering process at high temperatures. The samples were analyzed by X-ray powder diffraction, scanning electron microscopy and X-ray energy dispersive spectroscopy. Our results show that the oxygen partial pressure during the sintering process is an important parameter that controls the phase stability, non-stoichiometry, and decomposition process of the \{CCTO\} phase as well as the densification and grain growth mechanisms on these polycrystalline ceramics. These results provided us further insight into the important role of copper reduction and copper/oxygen diffusion on the crystalline structure and morphological characteristics of polycrystalline \{CCTO\} ceramics.

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