Room Temperature Magnetic Rare-Earth Iron Garnet Thin Films with Ordered Mesoporous Structure
Room Temperature Magnetic Rare-Earth Iron Garnet Thin Films with Ordered Mesoporous Structure
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DOI：
10.1021/cm400999b
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发表时间：
2013-06
影响因子：
8.6
通讯作者：
C. Suchomski;C. Reitz;C. Sousa;J. Araújo;T. Brezesinski
中科院分区：
文献类型：
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作者：
C. Suchomski;C. Reitz;C. Sousa;J. Araújo;T. Brezesinski
两亲性聚合物是非常有吸引力的致孔剂用于制备有序的介孔薄膜和粉末的孔径范围从40到几个纳米的直径，因为它们都能够形成不同的超结构和溶胶-凝胶前体相互作用。在目前的工作中，我们首次报道了一系列高度结晶的稀土铁石榴石（RE_3Fe_5 O_（12），RE = Y，Gd-Dy）薄膜的合成与立方网络的互连孔平均直径为17 nm，通过简单的聚合物模板的水合硝酸盐。尽管有复杂的结晶途径，例如，Y3 Fe 5 O 12通过Y 4Fe 2 O 9和h-YFeO 3，所有这些材料的纳米级结构仅在有限程度上受到高温下固-固转化的影响。我们特别专注于聚合物模板Y3 Fe 5 O 12的形态，微观结构和磁性能的表征。这种新型介孔材料在加热到900 °C后为单相，在室温下具有良好的介孔性能。
Amphiphilic polymers are very attractive as porogens for the preparation of ordered mesoporous thin films and powders with pore sizes ranging from 40 down to a few nanometers in diameter because they are capable of both forming different superstructures and interacting with sol–gel precursors. In the present work, we report for the first time the synthesis of a series of highly crystalline rare-earth iron garnet (RE3Fe5O12, RE = Y, Gd–Dy) thin films with cubic networks of interconnected pores averaging 17 nm in diameter through facile polymer templating of hydrated nitrate salts. Despite intricate crystallization pathways, e.g., Y3Fe5O12 via Y4Fe2O9 and h-YFeO3, the nanoscale architecture of all these materials is only affected to a limited extent by solid–solid conversions at elevated temperatures. We specifically focus on the characterization of the morphology, microstructure, and magnetic properties of polymer-templated Y3Fe5O12. This novel mesoporous material is single phase after heating to 900 °C, f...