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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Local structure of LuBO3 prepared via sol-gel process and its transformation with temperature: B-11-NMR and L-edge XAS studies
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Local structure of LuBO3 prepared via sol-gel process and its transformation with temperature: B-11-NMR and L-edge XAS studies

机译：通过溶胶-凝胶法制备的LuBO3的局部结构及其随温度的转变：B-11-NMR和L-edge XAS研究

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The present work deals with the temperature effect on the stability range of LuBO3 prepared by sol-gel synthesis. Structural modifications from vaterite to calcite form versus the thermal treatments have been measured by X-ray diffraction and infrared spectroscopy. Several samples derived from the xerogel annealed at 400, 800 and 1200 degreesC were studied by B-11 solid state NMR and at the lutetium. L-I-L-III edges by X-ray absorption spectroscopy to determine the local atomic arrangement around the rare earth and the boron ions. The predominance of BO4 groups and the eightfold coordination of lutetium atoms in the LuBO3 xerogel in samples treated up to 800 degreesC indicate an evolution of the xerogel to vaterite form after thermal treatment instead of the expected calcite form as established for samples prepared by solid state reaction. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 16]
机译：目前的工作涉及温度对溶胶-凝胶法制备的LuBO3稳定性范围的影响。通过X射线衍射和红外光谱测量了从球ate石到方解石形式与热处理的结构变化。通过B-11固态NMR和在studied处研究了几种在400、800和1200℃退火的干凝胶样品。通过X射线吸收光谱法确定L-I-L-III的边缘，以确定稀土和硼离子周围的局部原子排列。在高达800摄氏度的温度下处理的样品中，LuBO3干凝胶中BO4基团的优势和of原子的八重配位表明热处理后干凝胶向ero石的演变，而不是固态反应制备的样品所期望的方解石形式。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：16]

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