Abstract
The lattice distortion and crystallite dimension of ground ZnO powder by a ball mill and a vibrating mill have been studied by X-ray diffraction and electron spin resonance methods.
The following results have been obtained.
(1) The intensity of the absorption line of g=1.96 decreases with decreasing crystallite dimension. This absorption is probably due to the surface defects.
(2) The line of g=2.006 is the overlapping of absorptions due to the surface and internal defects related to oxygen. These two absorptions have nearly equal g values but different line shapes. The intensity of the line increases with increasing lattice distortion.
(3) The intensity of the line of g=2.013 increases with increasing grinding time and this absorption is due to the internal defects.
