Mössbauer evaluation of cobalt ferrite nanoparticles synthesized by forced hydrolysis

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Hamdeh, Hussein H.
Hikal, W. M.
Taher, S. M.
Ho, J. C.
Thuy, N. P
Quy, O. K.; Hanh, N.

Hamdeh, H. H.; Hikal, W. M.; Taher, S. M.; Ho, J. C.; Thuy, N. P.; Quy, O. K.; Hanh, N.; , "Mössbauer evaluation of cobalt ferrite nanoparticles synthesized by forced hydrolysis," Journal of Applied Physics , vol.97, no.6, pp.064310-064310-4, Mar 2005 doi: 10.1063/1.1856219


Spinel cobalt ferrite in the form of nearly spherical particles, having a narrow range of particle size around 7.6 nm, was produced by forced hydrolysis. Between the magnetization blocking temperature of 180 K and the Mössbauer blocking temperature of 270 K, the magnetic anisotropy energy decreases rapidly with temperature. The occupancy of the octahedral sites by only half of the Co2+ cations may have weakened the crystalline anisotropy. Significant spin canting was also observed at these sites.

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