Critical Limitations in the Fabrication of Biferroic BiFeO3-CoFe2O4 Columnar Nanocomposites Due to Bismuth Loss
Critical Limitations in the Fabrication of Biferroic BiFeO3-CoFe2O4 Columnar Nanocomposites Due to Bismuth Loss
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DOI：
10.1021/cm803480q
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发表时间：
2009-04-14
影响因子：
8.6
通讯作者：
Fontcuberta, J.
中科院分区：
文献类型：
--
作者：
Dix, N.;Muralidharan, R.;Fontcuberta, J.
研究了在（001）和（111）取向SrTiO 3衬底上自组装生长BiFeO 3-CoFe 2 O 4柱状纳米复合材料过程中温度的影响，旨在控制柱状纳米复合材料的尺寸和横向有序性。发现生长温度对纳米物体形态的显著影响基本上是由于随着沉积温度的增加铋含量的强烈单调减少。有一个非常窄的（几十度）的衬底温度的最佳窗口，其中BiFeO 3可以允许少量的Bi赤字而不分解。在较高温度下沉积的样品的增强的铁磁响应信号形成的二次铁磁相所造成的BiFeO 3分解。因此，沉积温度是不是一个合适的自由参数来控制BiFeO 3纳米复合材料中的纳米物体的拓扑结构。
The influence of the temperature during self-assembled growth of BiFeO3-CoFe2O4 columnar nanocomposites on (001) and (111) oriented SrTiO3 substrates has been investigated aiming to control pillar size and lateral ordering. The dramatic influence of the growth temperature on the nanoobject morphology is found to be basically due to the strong monotonic reduction in the bismuth content as the deposition temperature increases. There is a very narrow (tens of degrees) optimal window of substrate temperature, in which BiFeO3 could permit a small deficit of Bi without decomposition. The enhanced ferromagnetic response of samples deposited at higher temperature signals formation of secondary ferromagnetic phases caused by BiFeO3 decomposition. Therefore, the deposition temperature is not a suitable free parameter to control the nanoobjects topology in BiFeO3 nanocomposites.