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The morphological alteration from δ- to α-Cr nanoparticles and the phase transition temperature were directly observed by in situ experiment using a transmission electron microscope. The icositetrahedral nanoparticle of δ-Cr transformed into a rhombic dodecahedral nanoparticle of α-Cr upon heating at 550∘C. It was demonstrated that the most stable shape of the α-Cr nanoparticle is the rhombic dodecahedron...
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