Hard x-ray methods for studying the structure of amorphous thin films and bulk glassy oxides
Hard x-ray methods for studying the structure of amorphous thin films and bulk glassy oxides
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用于研究非晶薄膜和块状玻璃氧化物结构的硬 X 射线方法
DOI：
10.1088/1361-648x/abe352
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Weber, J K
中科院分区：
文献类型：
--
作者：
Benmore, C J;González, G B;Alderman, O L;Wilke, S K;Yarger, J L;Leinenweber, K;Weber, J K
高能光子衍射最大限度地减少了与实验室X射线衍射仪相关的许多校正，并使结构因子测量能够在广泛的动量传递范围内进行。该方法使我们更接近理想的实验，在该实验中，可以在不知道样品密度的情况下提取配位数。三个案例研究，展示了新的硬X射线方法研究玻璃和非晶材料的结构。首先，方法和分析的高能量掠入射薄膜的情况下，非晶氧化铟进行了讨论。不规则InO 6多面体的连通性以面、边、角共享的方式存在，其比例约为1：2：3。其次，对富硅钡硅酸盐（20 BaO：80 SiO2）从1500 ℃单相熔体到室温分相玻璃的激光加热空气动力学悬浮样品进行了高能小角宽角散射技术研究。根据Ba-O配位数为6 ~ 7，认为Ba的离子势弱到足以使液-液不相容性变为亚稳态。最后，高能量小角度和宽角度散射也已应用于高含水量（高达12重量%）在4GPa压力下从1500 ℃淬火的含水SiO2玻璃样品。发现在4.3 μ m处Si 1-O2相关性的增加与以较大环为代价的三元SiO 4环数量的增加一致。
High-energy photon diffraction minimizes many of the corrections associated with laboratory x-ray diffractometers, and enables structure factor measurements to be made over a wide range of momentum transfers. The method edges us closer toward an ideal experiment, in which coordination numbers can be extracted without knowledge of the sample density. Three case studies are presented that demonstrate new hard x-ray methods for studying the structure of glassy and amorphous materials. First, the methodology and analysis of high-energy grazing incidence on thin films is discussed for the case of amorphous In 2 O 3. The connectivity of irregular InO 6 polyhedra are shown to exist in face-, edge-and corner-shared configurations in the approximate ratio of 1: 2: 3. Secondly, the technique of high-energy small and wide angle scattering has been carried out on laser heated and aerodynamically levitated samples of silica-rich barium silicate (20BaO: 80SiO 2), from the single phase melt at 1500 o C to the phase separated glass at room temperature. Based on Ba–O coordination numbers of 6 to 7, it is argued that the although the potential of Ba is ionic, it is weak enough to cause the liquid–liquid immiscibility to become metastable. Lastly, high-energy small and wide angle scattering has also been applied to high water content (up to 12 wt.%) samples of hydrous SiO 2 glass quenched from 1500 o C at 4 GPa. An increase of Si 1–O 2 correlations at 4.3 Å is found to be consistent with an increase in the population of three-membered SiO 4 rings at the expense of larger rings.
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氧化物熔体中的低阳离子配位。
影响因子：
8.6
作者：
L. Skinner;C. Benmore;J. Weber;Jincheng Du;Jörg Neuefeind;S. Tumber;J. B. Parise
通讯作者：
J. B. Parise
含水量高达 10%（重量）的稳定硅酸盐玻璃
DOI：
--
发表时间：
1980
期刊：
影响因子：
--
作者：
Che
通讯作者：
Che
硅酸盐玻璃和含 Sr 或 Ba 晶体的衍射数据中低 Q 值特征的比较
DOI：
--
发表时间：
1999
期刊：
影响因子：
--
作者：
L. Cormier;P. Gaskell;S. Creux
通讯作者：
S. Creux
硅酸盐熔体中液-液相分离的小角和广角 X 射线散射研究
DOI：
--
发表时间：
2020
期刊：
影响因子：
--
作者：
C. Benmore;O. Alderman;S. R. Benmore;S. Wilke;R. Weber
通讯作者：
R. Weber
DOI：
10.1016/j.nima.2019.163318
发表时间：
2020-03-01
影响因子：
1.4
作者：
Benmore, C. J.;Alderman, O. L. G.;Weber, J. K. R.
通讯作者：
Weber, J. K. R.