A Multi-nuclear Multiple-Field Nuclear Magnetic Resonance Study of the Y_2O_3-Al_2O_3 Phase Diagram

Pierre Florian; Monique Gervais; Andre Douy; Dominique Massiot; Jean-Peirre Coutures

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A Multi-nuclear Multiple-Field Nuclear Magnetic Resonance Study of the Y_2O_3-Al_2O_3 Phase Diagram

机译：Y_2O_3-AL_2O_3相图的多核多场核磁共振研究

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We have been investigating several compounds belonging to the Y 203- Al2O3 phase diagram by means of aluminum-27, oxygen-17, and yttrium-89 high-resolution solid-state nuclear magnetic resonance .(NMR) spectroscopy. All aluminum, oxygen and yttrium sites of the five crystalline compounds C- Y 203, Y ~1209, Y AI03, Y 3A15O12, and a-AI2O3) have been resolved and the NMR parameters deduced. Alvl sites exhibit isotropic chemical shift Oiso between 0 and 10 ppm and small quadrupolar coupling constant CQ, whereas AJIv are located between 70 and 80 ppm and show large CQ. 170 resonances are characterized by small CQ and Oiso ranging from 72 ppm (AI2O3) to 358 ppm (Y 203) and showing a strong sensitivity to the nature of the second coordiriationsphere of oxygen as well as its coordination number. 89y Oiso are found between 184 and 314 ppm and are not strongly correlated to the coordination state of yttrium, the chemical shift anisotropy being found moderate ( approx 100 ppm). On the basis of the results obtained with the crystalline phases, we have characterized the oxygen environment in a glassy sample of composition y 3AI5012 and described the variation of the local structure during the crystallization process of y Al03 from the sol- gel raw product. In the vitreous state, oxygen's environments can be described in terms of OYkAI4-k sites, with respective populations not distributed in a purely random fashion, and two types of 5-fold-like aluminum environmerlts can be evidenced. A quantitative description of the heat treatments of the Y AI03 precursor is given by 170 NMR experiments in terms of Y~1209, Y3Al5012;andamorphous phases formed. New oxygen environments are also evidenced and maybe attributed to the hexa,g(}nal metastable fonn of y A 10,

机译：我们一直通过铝-27，氧气-17和钇-89高分辨率固态核磁共振来研究属于Y 203-Al2O3相图的几种化合物。（NMR）光谱。已经解决了五种结晶化合物C-Y 203，Y〜1209，Y AiO O3，Y 3a15O12和A-Ai2O3的所有铝，氧气和钇位点，并推导出NMR参数。 ALVL位点在0至10ppm和小型Quadrupolar耦合常数CQ之间表现出各向同性化学换档Oiso，而Ajiv位于70至80ppm之间并显示大Cq。 170共振的特征在于小CQ和Oiso，从72ppm（Ai2O3）到358ppm（Y 203），并对氧气的第二核心的性质以及其协调数表示强烈的敏感性。 89Y Oiso发现在184和314ppm之间，并且与钇的协调状态没有强烈相关，化学变化各向异性被发现适度（约100ppm）。基于用晶相获得的结果，我们已经表征了组合物Y 3ai5012的玻璃状样品中的氧环境，并在溶胶原料产品中描述了在Y Al03的结晶过程中局部结构的变化。在玻璃体状态下，氧气的环境可以根据Oykai4-K站点描述，其中不同的群体以纯随机的方式分布，并且可以证明两种类型的5倍状铝环保器。在Y〜1209，Y3Al5012方面，由170 NMR实验给出了Y AIO 2前体的热处理的定量描述;形成的胚轴阶段。新的氧气环境也显着，并且可能归因于六兆，G（y A 10的亚稳态Fonn，

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《The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical》 |2001年第2期|共13页
作者
Pierre Florian; Monique Gervais; Andre Douy; Dominique Massiot; Jean-Peirre Coutures;
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CNRS-CRMHT 1D Avenue de la Recherche Scientifique 45071 Orleans Cedex 2 France;

CNRS-CRMHT 1D Avenue de la Recherche Scientifique 45071 Orleans Cedex 2 France;

CNRS-CRMHT 1D Avenue de la Recherche Scientifique 45071 Orleans Cedex 2 France;

CNRS-CRMHT 1D Avenue de la Recherche Scientifique 45071 Orleans Cedex 2 France;

CNRS-CRMHT 1D Avenue de la Recherche Scientifique 45071 Orleans Cedex 2 France;

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1. A Multi-nuclear Multiple-Field Nuclear Magnetic Resonance Study of the Y_2O_3-Al_2O_3 Phase Diagram [J] . Pierre Florian, Monique Gervais, Andre Douy, The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical . 2001,第2期

机译：Y_2O_3-AL_2O_3相图的多核多场核磁共振研究
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A Multi-nuclear Multiple-Field Nuclear Magnetic Resonance Study of the Y_2O_3-Al_2O_3 Phase Diagram

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