Modifications induced by acetylacetone in properties of sol-gel derived Y(3)Al(5)O(12) : Tb(3+)- I: structural and morphological organizations.
Modifications induced by acetylacetone in properties of sol-gel derived Y(3)Al(5)O(12) : Tb(3+)- I: structural and morphological organizations.
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DOI：
10.1039/c005452f
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发表时间：
2010-09
影响因子：
4
通讯作者：
A. Potdevin;G. Chadeyron;V. Briois;F. Leroux;C. Santilli;M. Dubois;D. Boyer;R. Mahiou
中科院分区：
文献类型：
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作者：
A. Potdevin;G. Chadeyron;V. Briois;F. Leroux;C. Santilli;M. Dubois;D. Boyer;R. Mahiou
以乙酰丙酮为化学改性剂合成了未掺杂和掺杂Tb（3+）的Y（3）Al（5）O（12）粉末。系统地研究了它对非晶和晶化样品的结构和形态性质的影响。用X射线衍射、红外光谱、扫描电镜、X射线吸收光谱和小角X射线散射光谱等方法对这些性能进行了比较研究。（27）进行了Al NMR和EPR实验。综合结果表明，乙酰丙酮促进有机基团在煅烧过程中离开，在较低的温度下，与未改性的粉末相比，需要一个更好的结构组织。结构化已被证明发生在短尺度范围内，直到600摄氏度的加热处理，然后通过在更高温度下的聚结而扩展。最后，acac配体的存在下的醇盐导致一个单体簇聚集的过程，从而形成一个更开放的网络。
Acetylacetone has been used as a chemical modifier for the synthesis of undoped and Tb(3+)-doped Y(3)Al(5)O(12) powders. A systematic investigation concerning its influence on the structural and morphological properties of amorphous and crystallized samples has been carried out. These properties have been comparatively studied by means of X-ray diffraction, infrared spectroscopy, SEM, XAS and SAXS. (27)Al NMR and EPR experiments have been performed to complete the study. The combined results have evidenced that acetylacetone promotes organic groups departure during calcination, entailing a better structural organization at lower temperatures compared with unmodified powders. Structuration has been proven to occur at short-scale range until a 600 degrees C heating treatment before being extended by coalescence at higher temperatures. Finally, the presence of acac ligands on the alkoxides leads to a monomer-cluster aggregation process, and thus to a more open network.