Anomalous change in electron density at nuclear sites in nanosize zinc ferrite

Upadhyay, C.; Verma, H. C.
September 2004
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2074
Academic Journal
Nanosize samples of zinc ferrite with different particle sizes synthesized by citrate precursor route have been studied by x-ray diffraction, transmission electron microscopy and Mössbauer spectroscopy. The observations suggest that the electronic processes depend sensitively on size, and a big variation occurs in the pattern of temperature dependence of isomer shift on changing the size from 5 nm to 6 nm and from 6 nm to 7 nm. The electron density at the nuclear sites first increases, then decreases and again increases as the temperature of the nanosize samples is increased from 12 K to 400 K. The electric-field gradient varies considerably as the size is changed, but remains almost independent of temperature for a particular size. It is concluded that different aspects of hyperfine interactions in nanophase become significant at different sizes.


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