Recrystallization of Zinc Oxide in a Sub- and Supercritical Water Mediumстатья
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Дата последнего поиска статьи во внешних источниках: 15 апреля 2020 г.
Аннотация:Electron microscopy was used to study the formation of a dispersed composition of a fine-crystalline powder during the recrystallization of zinc oxide in a water medium at 100–400°C. It was shown that recrystallization in condensed water is difficult but proceeds in a water medium in a vapor or supercritical state in the presence of an activator (ammonium chloride). It occurs under the influence of an introduced activator at temperatures up to 300°C and under the combined influence of the activator and thermal activation of the surface layer of crystals in the range of 300–400°C. In the recrystallization process, monodisperse ZnO powder with an average crystal size of 0.184 μm is converted into a polydisperse powder with several sizedistribution components and average sizes from 0.08 to a few μm.