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Synthesis of Co3O4 nanoparticles by oxidation-reduction method and its magnetic characterization

100%
Ozkaya T., Baykal A., Koseoğlu Y., Kavas H.
Open Chemistry
|
2009
|
vol. 7
|
issue 3
410-414
EN
Without any surfactant, antiferromagnetic Co3O4 nanoparticles were synthesized successfully for the first time by means of an oxidation-reduction method with cobalt sulfate as starting material, which was oxidized to cobalt salt by NaNO3 after alkalinizing with NaOH. Morphological, structural, spectroscopic and magnetic characterization of the product were done by SEM, TEM, XRD, and VSM, respectively. The average crystallite size (on the base of line profile fitting method), D and σ, is estimated as 30 ± 6 nm. Some anomalous magnetic properties and their enhanced effect have been observed in Co3O4 antiferromagnetic nanocrystallites, including a bias field, coercivity, permanent magnetic moments and an open loop. These phenomena are attributed to the unidirectional anisotropy which is caused by the exchange coupling between AFM and FM layers, the existence of the spin glass like surface spins of Co3O4 nanoparticles due to size effects and surface-area effect. [...]
2
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Ceramic materials made of CdTe and Cd-Zn-Te nanocrystalline powders

88%
Kolesnikov N., Borisenko E., Borisenko D., Gnesin B.
Open Chemistry
|
2011
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vol. 9
|
issue 4
619-623
EN
In the present study newly produced semiconductor ceramic nanopowder materials made of CdTe and Cd1−xZnxTe (CZT) are considered. Common features and differences in microstructures, phase transformations, grain growth and properties of the ceramic materials of the binary and ternary compositions are studied. [...]
3
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Sonochemical synthesis and chracterization of Mn3O4 nanoparticles

88%
Baykal A., Kavas H., Durmuş Z., Demir M., Kazan S., Topkaya R., Toprak M.
Open Chemistry
|
2010
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vol. 8
|
issue 3
633-638
EN
We report on the synthesis of Mn3O4 nanoparticles (NPs) using a novel sonochemical method without requiring any pH adjustment. Synthesized material was identified as tetragonal hausmannite crystal structure model of Mn3O4 from XRD analysis. Crystallite size was estimated from x-ray line profile fitting to be 17±5 nm. FTIR analysis revealed stretching vibrations of metal ions in tetrahedral and octahedral coordination confirming the crystal structure. TEM analysis revealed a dominantly cubic morphology of NPs with an average size of ∼20 nm. Magnetic evaluation revealed a blocking temperature, T B of 40 K above which the material behaves paramagnetic. Asymmetric coercive field is attributed to the interaction between ferromagnetic Mn3O4 and antiferromagnetic Mn oxide at the surface of nanoparticles. [...]
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