Electric field-assisted flash sintering of CaCu3Ti4O12: Microstructure characteristics and dielectric properties
Electric field-assisted flash sintering of CaCu3Ti4O12: Microstructure characteristics and dielectric properties
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DOI：
10.1016/j.jallcom.2016.05.002
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发表时间：
2016-10-15
影响因子：
6.2
通讯作者：
M'Peko, Jean-Claude
中科院分区：
文献类型：
--
作者：
Jesus, Lilian Menezes;Silva, Ronaldo Santos;M'Peko, Jean-Claude
The electric field-assisted flash sintering method recently introduced in the literature was here considered for producing high-quality CaCu3Ti4O12 electroceramics, from a powder originally synthesized by a Pechini-derived method and calcined at 800 degrees C for 2 h. The study included analyzing the dynamics of material shrinkage and densification. With increasing the electric field (E), three distinct regimes were observed: a conventional-like sintering behavior for E < 15 V/cm, followed by a region of accelerated (fast-dominated) sintering for 15 less than or similar to E < 30 V/cm, and then the flash-dominated regime, for E greater than or similar to 30 V/cm, where sintering is not only accelerated but occurs suddenly. In consequence, sintering of the material under field input takes place at furnace temperatures sensibly lower, reaching a value as low as 750 degrees C for E = 60 V/cm versus 1050 degrees C in conventional processing. The probable physical mechanism behind each regime, including the role of the rise in sample temperature induced by the applied field (Joule heating), is also discussed. Finally, a correlation was found between the microstructure characteristics achieved during sintering and the dielectric response measured. (C) 2016 Elsevier B.V. All rights reserved.
