The existence of a quasi fluid state of very small metal particles at high temperatures was the quintessential result of high-resolution electron-microscopic video recordings of Ru microcrystals, which form from [Ru55(PtBu3)12Cl20] upon bombardment with electrons. The HREM video recording of a 3-nm Ru crystal (picture at right) shows that both cubic and hexagonal close-packed structures exist simultaneously in the same crystal.
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Malm et al. (1988) studied this question.
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