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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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
JournalJournal of Applied Physics
Volume112
Issue number10
DOIs
Publication statusPublished - 2012 Nov 15

Fingerprint

magnetite
bismuth
ferrites
nanocrystals
templates
oxides
bismuth oxides
volatility
hematite
dichroism
magnetic measurement
x rays
absorption spectra
thermodynamics
anisotropy
oxygen
synthesis
crystals
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Cheung, J., Bogle, K., Cheng, X., Sullaphen, J., Kuo, C. Y., Chen, Y. J., ... Valanoor, N. (2012). Phase evolution of magnetite nanocrystals on oxide supports via template-free bismuth ferrite precursor approach. Journal of Applied Physics, 112(10), [104321]. https://doi.org/10.1063/1.4766748
Cheung, Jeffrey ; Bogle, Kashinath ; Cheng, Xuan ; Sullaphen, Jivika ; Kuo, Chang Yang ; Chen, Ying Jiun ; Lin, Hong Ji ; Chen, Chien Te ; Yang, Jan Chi ; Chu, Ying Hao ; Valanoor, Nagarajan. / Phase evolution of magnetite nanocrystals on oxide supports via template-free bismuth ferrite precursor approach. In: Journal of Applied Physics. 2012 ; Vol. 112, No. 10.
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Cheung, J, Bogle, K, Cheng, X, Sullaphen, J, Kuo, CY, Chen, YJ, Lin, HJ, Chen, CT, Yang, JC, Chu, YH & Valanoor, N 2012, 'Phase evolution of magnetite nanocrystals on oxide supports via template-free bismuth ferrite precursor approach', Journal of Applied Physics, vol. 112, no. 10, 104321. https://doi.org/10.1063/1.4766748

Phase evolution of magnetite nanocrystals on oxide supports via template-free bismuth ferrite precursor approach. / Cheung, Jeffrey; Bogle, Kashinath; Cheng, Xuan; Sullaphen, Jivika; Kuo, Chang Yang; Chen, Ying Jiun; Lin, Hong Ji; Chen, Chien Te; Yang, Jan Chi; Chu, Ying Hao; Valanoor, Nagarajan.

In: Journal of Applied Physics, Vol. 112, No. 10, 104321, 15.11.2012.

Research output: Contribution to journalArticle

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AU - Cheung, Jeffrey

AU - Bogle, Kashinath

AU - Cheng, Xuan

AU - Sullaphen, Jivika

AU - Kuo, Chang Yang

AU - Chen, Ying Jiun

AU - Lin, Hong Ji

AU - Chen, Chien Te

AU - Yang, Jan Chi

AU - Chu, Ying Hao

AU - Valanoor, Nagarajan

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N2 - 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.

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