High-purity powders of SnO nanocrystallites with crystallite sizes less than 30 nm and surface areas up to 40 m~2/g have been synthesized by a solution process, in which amorphous oxy-hydroxy precipitate of Sn~(+2) is crystallized with microwave heating. Microwave heating was found to have selectively accelerated SnO crystallization but not the concurrent Sn~(+2)-to-Sn~(+4) oxidation, which otherwise prevails in the conventional thermal heating process. Control studies give strong indication of a non-temperature effect of the microwave irradiation in the present process.
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