Title

Mechanosynthesis of nanocrystalline MgFe2O4-neutron diffraction and Mossbauer spectroscopy

RIS ID

40010

Publication Details

Sepelak, V., Bergmann, I., Feldhoff, A., Litterst, F. J., Becker, K. D., Cadogan, J. M., Hofmann, M., Hoelzel, M., Wang, J., Avdeev, M. & Campbell, S. J. (2010). Mechanosynthesis of nanocrystalline MgFe2O4-neutron diffraction and Mossbauer spectroscopy. Hyperfine Interactions, 198 (1-3), 67-71.

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.

Please refer to publisher version or contact your library.

Share

COinS
 

Link to publisher version (DOI)

http://dx.doi.org/10.1007/s10751-010-0243-y