The DOI matches its Crossref record; 22 of the 22 references it cites were found in a registry or an index.
Sonochemical Preparation of Nanosized Amorphous NiFe2O4 Particles
Abstract
Nanosized amorphous NiFe 2 O 4 powder was prepared by sonochemical decomposition of solutions of volatile organic precursors, Fe(CO) 5 and Ni(CO) 4, in decalin at 273 K, under an oxygen pressure of 100−150 kPa. The amorphous nature of these particles was confirmed by various techniques, such as SEM, TEM, electron microdiffraction, and X-ray diffractograms. Magnetic measurements, Mössbauer, and EPR spectral studies indicated that the as-prepared NiFe 2 O 4 ferrite particles were superparamagnetic. The Mössbauer spectrum of the crystallized sample showed a clear sextet pattern, with hyperfine field values of 500 and 508 kOe for A (tetrahedral) and B (octahedral) sublattices, respectively, of the inverse spinel NiFe 2 O 4 . Saturation magnetization of the annealed sample (25 emu/g) was significantly lower than that for the reported multidomain bulk prticles (55 emu/g), reflecting the ultrafine nature of the sample. Thermogravimetric measurements with a permanent magnet gave Curie temperatures of 440 °C for amorphous and 560 °C for the crystallized forms.
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Magnetic Nanoparticles as MRI Contrast Agents
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Metadata
- Authors
- Shafi, K. V. P. M., Koltypin, Y., Gedanken, A., Prozorov, R., Balogh, J., Lendvai, J., & Felner, I.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-08-01
- Volume
- 101
- Issue
- 33
- Pages
- 6409-6414
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2032886404
- Cited by
- 301
- References
- 22
- FWCI
- 5.23
- Type
- journal article
- Language
- en
- Open access
- closed
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