Structure of amorphous alumina tubes studied by positron annihilation lifetime spectroscopy
Structure of amorphous alumina tubes studied by positron annihilation lifetime spectroscopy
复制标题
正电子湮没寿命谱研究非晶氧化铝管的结构
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
I. Melikhov
中科院分区：
文献类型：
--
作者：
V. Shantarovich;I. Kevdina;N. Miron;Yu. V. Baronova;S. S. Berdonosov;S. Baronov;I. Melikhov
用正电子湮没寿命谱（帕尔斯）研究了无水AlCl 3热水解制备的非晶氧化铝管的详细结构。结果表明，帕尔斯是一个敏感的探针的结构的非晶材料，能够区分结构的非晶氧化铝管和非晶氧化铝制备的标准程序，这是略有不同的自由体积元素的浓度和大小。观察到的区别可以理解为在水介质中水解或在水蒸气中热水解期间初级氧化铝颗粒的各向异性聚集。
Positron annihilation lifetime spectroscopy (PALS) is used to investigate the detailed structure of amorphous alumina tubes prepared via thermohydrolysis of anhydrous AlCl3 . The results demonstrate that PALS is a sensitive probe of the structure of amorphous materials, capable of distinguishing between the structures of amorphous alumina tubes and amorphous alumina prepared by a standard procedure, which are shown to differ slightly in the concentration and size of free-volume elements. The observed distinctions can be understood in terms of the anisotropic aggregation of primary alumina particles during hydrolysis in aqueous media or thermohydrolysis in water vapor.