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首页> 外文期刊>Crystal Research and Technology: Journal of Experimental and Industrial Crystallography >EFFECT OF FLUORIDE AND SODIUM IONS ON STRUCTURAL AND THERMAL PROPERTIES OF GAMMA-AL2O3
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EFFECT OF FLUORIDE AND SODIUM IONS ON STRUCTURAL AND THERMAL PROPERTIES OF GAMMA-AL2O3

机译：氟化物和钠离子对GAMMA-AL2O3结构和热性能的影响

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摘要

The structural properties of alumina as well as its fluoride and sodium modifications were characterized by X-ray diffraction, infrared spectroscopy and differential thermal analysis. We have shown, that fluoride ions interact with hydroxyls type Ia of gamma-Al2O3 forming Al-F species, which then react at 400 degrees C forming beta-Al2O3. Morever, F/Al2O3 sample heated up to 400 degrees C contain two acidic hydroxyls type IIa and III, which are also represented on a differential thermal curve as endoeffect with minima at 470 and 500 degrees C. For Na/Al2O3 sample the same types of hydroxyls interact with Na+ ions leading to substitution of their protons. After heating at 400 degrees C this sample contains also hydroxyls type IIa and III, which are represented by two endothermal effects with minima at 450 and 520 degrees C. Differential thermal analysis shown to be a powerful and simple technique to characterize surface hydroxyl types of Na and F samples supported on gamma-alumina. [References: 14]
机译：通过X射线衍射，红外光谱和差热分析来表征氧化铝的结构特性及其氟化物和钠的改性。我们已经表明，氟离子与形成Al-F物种的γ-Al2O3的羟基类型Ia相互作用，然后在400摄氏度下反应形成β-Al2O3。此外，加热到400摄氏度的F / Al2O3样品含有两种酸性羟基IIa和IIIa，它们在差热曲线上也表现为在470和500摄氏度下具有最小内吸作用。对于Na / Al2O3样品，相同类型的羟基与Na +离子相互作用，导致质子取代。在400摄氏度下加热后，该样品还包含IIa和III型羟基，这两种吸热效应在450和520摄氏度下具有两个内热效应。差异热分析显示了表征Na表面羟基类型的强大而简单的技术和F样品负载在γ-氧化铝上。 [参考：14]

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