Abstract
A method is described which
enables the position of interstitial zinc within the crystals of zinc oxide
powders to be determined. The crystals are etched to various depths with acid,
and the excess zinc content of each fraction is estimated. It is shown that the
distribution of the interstitial zinc is dependent upon the species of
chemisorbed oxygen prevalent, and that a marked concentration of excess zinc in
the surface fraction of the crystals is apparent only in those samples of zinc
oxide on which the oxygen chemisorbed is predominantly of the reactive variety.
The method provides a convenient means of
following the diffusion of interstitial zinc on heating. The changes in the
distribution of interstitial zinc in both types of zinc oxide that occur on
heating in air are shown and discussed.
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