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Title: Hyperfine fields in nano particles of Cr₀․₂₅Co₀․₂₅Zn₀․₅Fe₂O₄
Authors: Sharma, Ram Kripal
Suwalka, Om Prakash
Lakshmi, N
Venugopalan, K
Keywords: Nanoparticles;Fe-57 Mössbauer spectroscopy;Superparamagnetism
Issue Date: Oct-2007
Publisher: CSIR
IPC Code: B82B, G01J3/28
Abstract: Nano particles of Cr substituted cobalt zinc ferrite (Cr₀․₂₅Co₀․₂₅Zn₀․₅Fe₂O₄) were synthesized using chemical co-precipitation technique. Particles of average crystallite sizes varying from 5 to 23 nm were obtained by controlling the annealing temperature during preparation. Fe-57 Mössbauer studies at room temperature showed that samples with particle sizes smaller than 10nm were superparamagnetic while those with bigger particle sizes showed the co-existence of a ferrimagnetic phase with a superparamagnetic one. Mössbauer spectra recorded at 25 K for the smallest sized sample showed well defined sextets with hyperfine fields of 520 kOe and 484 kOe corresponding to the A and B sites.
Page(s): 830-833
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.45(10) [October 2007]

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