Reaction pathways in the solid state synthesis of multiferroic BiFeO3
Reaction pathways in the solid state synthesis of multiferroic BiFeO3
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DOI：
10.1016/j.jeurceramsoc.2011.03.018
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发表时间：
2011-12-01
影响因子：
5.7
通讯作者：
Villegas, M.
中科院分区：
文献类型：
--
作者：
Bernardo, M. S.;Jardiel, T.;Villegas, M.
多铁性BiFeO_3作为纯单相产物的获得尤其复杂，因为第二相的形成似乎是不可避免的。通过分析Bi2O_3-Fe_2O_3系统的扩散和固相反应性，研究了这些二次杂质的形成过程。实验证据表明，Bi3+离子在Fe2O_3颗粒中的渐进扩散控制了钙钛矿型BiFeO_3相的固相合成。然而，扩散过程和稳定的Bi2Fe4O9莫来石晶体的结晶之间存在竞争，扩散过程倾向于完成BiFeO3的形成，而稳定的Bi2Fe4O9莫来石晶体的结晶倾向于阻止该形成反应。(C)2011爱思唯尔有限公司。保留所有权利。
The obtaining of multiferroic BiFeO3 as a pure single-phase product is particularly complex since the formation of secondary phases seems to be unavoidable. The process by which these secondary impurities are formed is studied by analyzing the diffusion and solid state reactivity of the Bi2O3-Fe2O3 system. Experimental evidence is reported which indicates that the progressive diffusion of Bi3+ ions into the Fe2O3 particles governs the solid state synthesis of the perovskite BiFeO3 phase. However a competition is established between the diffusion process which tends to complete the formation of BiFeO3, and the crystallization of stable Bi2Fe4O9 mullite crystals, which tend to block that formation reaction. (C) 2011 Elsevier Ltd. All rights reserved.