We have obtained monodisperse (V 1-xCr x) 2O 3 nanocrystals with crystal sizes of 21.0 ± 4.1 nm using organic-phase synthesis. The (V 1- xCr x) 2O 3 nanocrystals clearly show the transition from a corundum structured paramagnetic metal to a monoclinic structured antiferromagnetic insulator in contrast to non-doped V 2O 3 nanocrystals, in which the disappearance of the metal-insulator transition has been observed. We have found that Cr doping works effectively in narrowing the a 1g band, which tends to be broadened by nanocrystallization. This result suggests that chemical doping is useful for control of material phase transitions at the nanoscale.
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