It is an intrinsic question whether or not the small metallic nanoclusters might have a structure different from the bulk structure. We observed a face-centered-cubic (fcc) structure for small Cr and Mo nanoclusters rather than a bulk body-centered-cubic (bcc) structure. We determined the critical cluster size ncrit to be 490±100 for metallic Cr nanoclusters and the range of the ncrit to be 1460--3900 for metallic Mo nanoclusters at which a structural transition from the fcc structure into the bulk bcc structure occurred.
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Huh et al. (2000) studied this question.
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