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 to and from to . The electron density at the nuclear sites first increases, then decreases and again increases as the temperature of the nanosize samples is increased from to . 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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Research Article| September 17 2004
Anomalous change in electron density at nuclear sites in nanosize zinc ferrite
C. Upadhyay, H. C. Verma; Anomalous change in electron density at nuclear sites in nanosize zinc ferrite. Appl. Phys. Lett. 13 September 2004; 85 (11): 2074–2076. https://doi.org/10.1063/1.1786368
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