Phase evolution of magnetite nanocrystals on oxide supports via template-free bismuth ferrite precursor approach

Jeffrey Cheung, Kashinath Bogle, Xuan Cheng, Jivika Sullaphen, Chang Yang Kuo, Ying-Jiun Chen, Hong Ji Lin, Chien Te Chen, Jan-Chi Yang, Ying Hao Chu, Nagarajan Valanoor

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8 Citations (Scopus)


This report investigates the phase evolution pathway of magnetite nanocrystal synthesis on oxide-supported substrates. A template-free phase separation approach, which exploits the thermodynamic instability of ternary perovskite BiFeO3 and inherent volatility of bismuth oxide in low oxygen pressure and high temperature is presented. The formation of an intermediate hematite nanocrystal phase is found as a key step that controls the eventual size and morphology of the magnetite nanocrystals. X-ray absorption spectra measurements and X-ray magnetic circular dichroism confirm that the spectral fingerprints of the magnetite nanocrystals match with that of bulk crystals. Magnetic measurements show that magnetic anisotropy is directly attributed to the nanocrystal morphology. 

Original languageEnglish
Article number104321
Number of pages8
JournalJournal of Applied Physics
Issue number10
Publication statusPublished - 15 Nov 2012
Externally publishedYes

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