Electric field-assisted flash sintering of fine-grained and high-permittivity CaCu_3Ti_4O_(12) (CCTO) electroceramics

摘要

1. Sintering is accelerated (FAST effect) for E ＞ 15 V/cm, ending with a FLASH event; 2. Both events implied sintering at furnace temperatures considerably lower than in conventional processing; 3. for E ＜ 15 V/cm, there was no improved sintering rate, and AGS increased with field (Joule heating); 4. for approx＞ 15 V/cm, the AGS decreased with £; 5. ε' values reproduced thoroughly the behavior of AGS with varying E, suggesting ε'to be modulated by the dielectric response from grain boundaries;