|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.45 [2007] >
IJPAP Vol.45(10) [October 2007] >
| 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 |
| Source: | IJPAP Vol.45(10) [October 2007]
|
|
