Fragmentation of Fe[sub 2]O[sub 3] nanoparticles driven by a phase transition in a flame and their magnetic properties

Sangsun Yang, S. N. G.; Ji-Hyun Yi, S. N. G.; Soonil Son, S. N. G.; Jungho Jang, S. N. G.; Atlman, Igor S.; Pikhitsa, Peter V.; Mansoo Choi
December 2003
Applied Physics Letters;12/8/2003, Vol. 83 Issue 23, p4842
Academic Journal
The size and crystalline phase changes of Fe[sub 2]O[sub 3] nanoparticles formed in a H[sub 2]/O[sub 2] flame have been investigated. At flame temperatures below 1350 °C, the mean particle size increased monotonously with the distance from the burner edge; but in high-temperature flames above 1650 °C, it suddenly decreased from 20 to ∼3 nm with the distance from the burner edge. The results of X-ray diffraction and high-resolution transmission electron microscopy showed that this sudden reduction of the size of nanoparticles was accompanied by a partial phase transformation from the metastable γ-Fe[sub 2]O[sub 3] into α-Fe[sub 2]O[sub 3]. We suggest the structural instability due to γ- to α-phase transformation as a mechanism for a rapid fragmentation of 20 nm particles into 3 nm ones. © 2003 American Institute of Physics.


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