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양상선(Sangsun Yang),이고르 알트만(Igor S. Altman),피터 피키차(Peter V. Pikhitsa),최만수(Mansoo Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Size and crystalline phase changes of Fe₂O₃ nanoparticles formed in a H₂/O₂ 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 nm to ~3 nm with the distance from the burner edge. The results of X-ray diffraction and HRTEM showed that this sudden reduction of the size of nanoparticles was accompanied by a partial phase transformation from γ-Fe₂O₃ into α-Fe₂O₃. 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.