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Ultrafine ZnGa 2 O 4 spinel particles ranging from 4 to 11 nm of crystallite size were directly precipitated by dropping a mixed solution of zinc sulfate and gallium sulfate into aqueous NH 3 at a temperature of 25 to 90 o C with stirring. They were also precipitated by aging the mixed solution in the presence of either urea or hexamethylenetetramine at 90 o ...
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