Abstract
The effect of dry-grinding by ball mill and vibration mill with an alumina vessel on the ESR spectra of zinc oxide powder has been studied. The ESR A(g=2.013), B(g=2.005), C(g=1.955) and C'(g=1.959) peaks were observed on the products which were heat-treated, preserved for a year in in vacuum, and surface-treated by aqueous HCl after grinding.
The results obtained are as follows.
(1) The C' peak corresponds with the broken-bonds formed on the surface of zinc oxide crystallites by cracking, and A peak corresponds with the dangling-bonds caused by dislocations in the crystallites.
(2) The B peak consists of B'(g1=2.007, g2=2.005, g3=2.002) and B"(g⊥=2.006, g//=2.003). B' peak corresponds with the oxygens combined to the broken-bonds formed on the surface and B" peak corresponds with the oxygens combined to the dangling-bonds on the dislocation in the crystallites.
