Role of oxygen on the phase stability and microstructure evolution of CaCu3Ti4O12 ceramics |
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| Affiliation: | 1. Physical Chemistry Department, Chemistry Institute, São Paulo State University (UNESP), Araraquara, São Paulo, Brazil;2. Advanced Materials Department, Jo?ef Stefan Institute, Ljubljana, Slovenia;1. Shenzhen Key Laboratory of New Lithium-ion Battery and Mesoporous Materials, College of Chemistry and Chemical Engineering, Shenzhen University, Shenzhen 518060, PR China;2. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China;3. College of Computer Science and Software Engineering, Shenzhen University, Shenzhen 518060, PR China;1. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Phase stability and microstructure evolution of polycrystalline CaCu3Ti4O12 (CCTO) ceramics were studied by controlling the partial pressure of oxygen (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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| Keywords: | Oxygen partial pressure Phase stability Non-stoichiometry Grain growth |
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