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采用水淬法制备出块状非晶态硒,通过非晶晶化法获得了六方晶型结构的、晶粒尺寸为6—45nm的块状纳米晶硒,X射线衍射及热分析研究表明非晶态硒向纳米晶硒的转变是由一步晶化完成的,激活能为54—60kJ/mol.并证实了非晶硒的短程序与六方晶型硒相同以及非晶硒的无规线团结构.根据不同方向的晶粒尺寸与晶化温度的关系,发现沿c轴的生长速率大于沿a轴的生长速率.采用无规线团形的分子链在晶界处折叠或延伸到相邻晶粒中的晶化机制解释了晶化过程中激活能低和生长速率沿c轴方向较大的实验结果.
A bulk amorphous selenium was prepared by water quenching method. Bulk hexagonal crystalline structure of nanocrystalline selenium with a grain size of 6-45nm was obtained by amorphous crystallization method. The results of X-ray diffraction and thermal analysis showed that the non- The transition from crystalline selenium to nanocrystalline selenium was completed by one-step crystallization with an activation energy of 54-60kJ / mol. It was confirmed that the short procedure of amorphous selenium was the same as that of hexagonal selenium and the random coil of amorphous selenium Structure.According to the relationship between grain size and crystallization temperature in different directions, it is found that the growth rate along the c-axis is larger than the growth rate along the a-axis.When the random chain-like molecular chains are folded or extended at the grain boundaries to adjacent The crystallization mechanism in the grains explains the experimental results of the low activation energy and the large growth rate along the c-axis in the crystallization process.