Mechanically Strain-Induced Modification of Selenium Powders in the Amorphization Process |
| |
Authors: | Fuse Makoto Shirakawa Yoshiyuki Shimosaka Atsuko Hidaka Jusuke |
| |
Institution: | (1) Department of Chemical Engineering and Materials Science, Doshisha University, Kyotanabe, Kyoto, 610-0321, Japan |
| |
Abstract: | For the fabrication of particles designed in the nanoscale structure, or the nanostructural modification of particles using mechanical grinding process, selenium powders ground by a planetary ball mill at various rotational speeds have been investigated. Structural analyses, such as particle size distributions, crystallite sizes, lattice strains and nearest neighbour distances were performed using X-ray diffraction, scanning electron microscopy and dynamical light scattering.By grinding powder particles became spherical composites consisting of nanocrystalline and amorphous phase, and had a distribution with the average size of 2.7 m. Integral intensities of diffraction peaks of annealed crystal selenium decreased with increasing grinding time, and these peaks broadened due to lattice strains and reducing crystallite size during the grinding. The ground powder at 200 rpm did not have the lattice strain and showed amorphization for the present grinding periods. It indicates that the amorphization of Se by grinding accompanies the lattice strain, and the lattice strain arises from a larger energy concerning intermolecular interaction. In this process, the impact energy is spent on thermal and structural changes according to energy accumulation in macroscopic (the particle size distribution) and microscopic (the crystallite size and the lattice strain) range. |
| |
Keywords: | high-energy ball mill amorphous transition lattice strain crystallite size nanostructural modification |
本文献已被 SpringerLink 等数据库收录! |
|