X-Ray Fourier Analysis of Ground ZnO Powder

Abstract

The lattice distortion and crystallite dimension of ZnO powder ground by a ball mill and a vibration mill have been studied by Stokes-corrected Fourier Analysis of X-ray diffraction pattern, electron spin resonance, heat treatment, etc..
The following results have been obtained.
(1) The internal strain and surface strain are about the same throughout the grinding process by a ball mill, but the surface strain is greater than the internal strain by a vibration mill.
(2) In the initial stage of grinding, the strain curve shows a minimum, and the intensity curve of ESR C peak crosses the curve of B peak. It seems that a part of the original strain in ZnO crystallites decreases and another sort of strain appears during the grinding process.
(3) From the results of the effect of heat treatment, it seems that the A peak of ESR correspond to the broken bonds associated with edge dislocations.
(4) The crystallite dimension is greater in the c-direction than in the a-direction, and this tendency is intensified by the grinding process.