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首页> 外文期刊>Advanced Functional Materials >Crystalline Mesoporous Complex Oxides: Porosity-Controlled Electromagnetic Response
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Crystalline Mesoporous Complex Oxides: Porosity-Controlled Electromagnetic Response

机译：结晶介孔复合氧化物：孔隙率控制的电磁响应

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A colloidal-amphiphile-templated growth is developed to synthesize mesoporous complex oxides with highly crystalline frameworks. Organosilane-containing colloidal templates can convert into thermally stable silica that prevents the overgrowth of crystalline grains and the collapse of the mesoporosity. Using ilmenite CoTiO3 as an example, the high crystallinity and the extraordinary thermal stability of its mesoporosity are demonstrated at 800 degrees C for 48 h under air. This synthetic approach is general and applicable to a series of complex oxides that are not reported with mesoporosity and high crystallinity, such as NiTiO3, FeTiO3, ZnTiO3, Co2TiO4, Zn2TiO4, MgTi2O5, and FeTi2O5. Those novel materials make it possible to build up correlations between mesoscale porosity and surface-sensitive physicochemical properties, e.g., electromagnetic response. For mesoporous CoTiO3, there is a 3 K increase of its antiferromagnetic ordering temperature, compared with that of nonporous one. This finding provides a general guideline to design mesoporous complex oxides that allow exploring their unique properties different from bulk materials.
机译：胶体-两亲为模板的生长被开发来合成具有高度结晶构架的中孔复合氧化物。含有机硅烷的胶体模板可以转化为热稳定的二氧化硅，从而防止晶粒过度生长和介孔性崩溃。以钛铁矿CoTiO3为例，在空气中，800摄氏度，48小时的条件下，证明了其高结晶度和中孔的非凡热稳定性。这种合成方法是通用的，适用于一系列没有介孔性和高结晶度的复合氧化物，例如NiTiO3，FeTiO3，ZnTiO3，Co2TiO4，Zn2TiO4，MgTi2O5和FeTi2O5。这些新颖的材料使得有可能在中尺度孔隙率和表面敏感的物理化学性质例如电磁响应之间建立相关性。与无孔CoTiO3相比，中孔CoTiO3的反铁磁有序温度增加了3K。该发现为设计介孔复合氧化物提供了一般性指导，从而可以探索其与散装材料不同的独特性能。

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