Abstract
A highly coloured pink zinc
oxide, having a total nitrogen content of 0.054%, has been prepared by heating
white zinc oxide and ammonium carbamate in an atmosphere of ammonia and carbon
dioxide at 200�. The preparation results in a marked increase in the specific
surface area of the zinc oxide. ��� The non-stoichiometry of the pink zinc
oxide has been determined, and it is shown that the amount of reactive oxygen
chemisorbed on the surface increases with time. The maximum chemisorption
amounted to 52 p.p.m. by weight (1.1 x 1025
ion m-3) after exposure for 35 days in a controlled environment. The
surface concentration of interstitial zinc has been estimated indirectly from
the reactive oxygen results. The concentration of the non-stoichiometric
species in pink zinc oxide is more than an order higher than that of the white
zinc oxide from which it was prepared. The results support the mechanism
tentatively proposed by previous workers for the incorporation of nitrogen in
zinc oxide.
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