Details
| Original language | English |
|---|---|
| Pages (from-to) | 67-71 |
| Number of pages | 5 |
| Journal | Hyperfine Interactions |
| Volume | 198 |
| Issue number | 1 |
| Publication status | Published - Jun 2010 |
Abstract
The evolution of nanocrystalline n-MgFe2O4 by high-energy milling a mixture of MgO and α-Fe2O3 for periods of between 0 h and 12 h has been investigated by neutron diffraction in addition to previous Mössbauer, XRD and HRTEM measurements. Complete transformation of the milled products to n-MgFe2O4 only occurs on milling to ~8 h even though the average particle size decreases to < ~10 nm after milling for 2 h. The applied field Mössbauer spectra of n-MgFe2O4 can be well described by two subspectra representing core and shell regions with different cation distributions and spin canting angles. The neutron pattern of nanocrystalline MgFe2O4 is described well by two components comprising nanoparticles of core and shell dimensions ~7(1) nm and ~0.7(1) nm, respectively, in support of the Mössbauer core-shell model.
Keywords
- MgFeO, Mössbauer, Nanocrystalline, Neutron diffraction
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Physics and Astronomy(all)
- Condensed Matter Physics
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Hyperfine Interactions, Vol. 198, No. 1, 06.2010, p. 67-71.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Mechanosynthesis of nanocrystalline MgFe2O4-neutron diffraction and Mössbauer spectroscopy
AU - Šepelák, V.
AU - Bergmann, I.
AU - Feldhoff, Armin
AU - Litterst, F. J.
AU - Becker, K. D.
AU - Cadogan, J. M.
AU - Hofmann, M.
AU - Hoelzel, M.
AU - Wang, J. L.
AU - Avdeev, M.
AU - Campbell, S. J.
N1 - Funding Information: Acknowledgements This work is supported by the Deutsche Forschungsgemeinschaft (SPP 1415) and by a joint agreement between ANSTO and UNSW. SJC acknowledges access to the major research facilities program supported by the Commonwealth of Australia under the International Science Linkages Program. JMC acknowledges support from the Canada Research Chairs programme.
PY - 2010/6
Y1 - 2010/6
N2 - The evolution of nanocrystalline n-MgFe2O4 by high-energy milling a mixture of MgO and α-Fe2O3 for periods of between 0 h and 12 h has been investigated by neutron diffraction in addition to previous Mössbauer, XRD and HRTEM measurements. Complete transformation of the milled products to n-MgFe2O4 only occurs on milling to ~8 h even though the average particle size decreases to < ~10 nm after milling for 2 h. The applied field Mössbauer spectra of n-MgFe2O4 can be well described by two subspectra representing core and shell regions with different cation distributions and spin canting angles. The neutron pattern of nanocrystalline MgFe2O4 is described well by two components comprising nanoparticles of core and shell dimensions ~7(1) nm and ~0.7(1) nm, respectively, in support of the Mössbauer core-shell model.
AB - The evolution of nanocrystalline n-MgFe2O4 by high-energy milling a mixture of MgO and α-Fe2O3 for periods of between 0 h and 12 h has been investigated by neutron diffraction in addition to previous Mössbauer, XRD and HRTEM measurements. Complete transformation of the milled products to n-MgFe2O4 only occurs on milling to ~8 h even though the average particle size decreases to < ~10 nm after milling for 2 h. The applied field Mössbauer spectra of n-MgFe2O4 can be well described by two subspectra representing core and shell regions with different cation distributions and spin canting angles. The neutron pattern of nanocrystalline MgFe2O4 is described well by two components comprising nanoparticles of core and shell dimensions ~7(1) nm and ~0.7(1) nm, respectively, in support of the Mössbauer core-shell model.
KW - MgFeO
KW - Mössbauer
KW - Nanocrystalline
KW - Neutron diffraction
UR - http://www.scopus.com/inward/record.url?scp=79951554934&partnerID=8YFLogxK
U2 - 10.1007/s10751-010-0243-y
DO - 10.1007/s10751-010-0243-y
M3 - Article
AN - SCOPUS:79951554934
VL - 198
SP - 67
EP - 71
JO - Hyperfine Interactions
JF - Hyperfine Interactions
SN - 0304-3843
IS - 1
ER -