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TEM images of thermally coarsened nanocrystalline ZnS in different environments. (a) Hydrothermal coarsening for 32 h at 225°C. (b) Vacuum coarsening for 2 h at 350°C. "W" indicates the location of wurtzite domains in the predominantly sphalerite particles. For further information on the data of Figs. 5a and 5b, see refs. 50 and 18, respectively.
