Electric field-assisted solid-state reaction of BaCO3-TiO2 system
Electric field-assisted solid-state reaction of BaCO3-TiO2 system
复制标题
BaCO3-TiO2体系的电场辅助固相反应
DOI：
10.1111/jace.18027
复制
发表时间：
2021
影响因子：
3.9
通讯作者：
Wang Yiguang
中科院分区：
文献类型：
--
作者：
Zhu Yan;Ma Baisheng;Wang Kewei;Sun Zhenzhong;Ren Ke;Wang Yiguang
报道了BaCO 3-TiO 2体系在电场辅助下的固相反应过程。实验在恒定的加热速率下进行，具有预设的场强和电流限制。在约1002℃、200 V/cm下进行反应性闪速烧结后，固态反应完成。在23.5 mA/mm 2的电流密度下进行闪速烧结后，得到了在这样的温度下很少出现的层状BaTiO 3相。据推测，闪速烧结过程中的缺氧引发了BaTiO 3的立方到六方转变。此外，X射线衍射结果表明，固态反应发生在闪速烧结之前。电场能加速反应，但不改变相演化的顺序。
We report phase transition process during the solid‐state reaction of BaCO3‐TiO2system under the assistance of electric field. Experiments were conducted at a constant heating rate with preset field strength and current limit. Solid‐state reaction was completed upon reactive flash sintering taking place at ~1002℃ under 200 V/cm. Hexagonal BaTiO3phase, which rarely occurs at such temperatures, was obtained after flash sintering at a current density of 23.5 mA/mm2. It is speculated that oxygen deficiency during flash sintering triggered cubic‐to‐hexagonal transition of BaTiO3. Furthermore, X‐ray diffraction results show that solid‐state reaction takes place prior to flash sintering. Electric field could accelerate the reaction but did not alter the sequence of phase evolution.