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Mössbauer effect studies on the formation of iron oxide phases synthesized via microwave–hydrothermal route.
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- Author(s): Bakare, P. P.; Date, S. K.; Khollam, Y. B.; Deshpande, S. B.; Potdar, H. S.; Salunke-Gawali, S.; Varret, F.; Pereira, E.
- Source:
Hyperfine Interactions; 2006, Vol. 168 Issue 1-3, p1127-1132, 6p, 1 Chart, 2 Graphs- Subject Terms:
- Source:
- Additional Information
- Abstract: Microwave–hydrothermal (MH) route was employed to synthesize various iron oxide phases in ultra-fine crystalline powders by using ferrous sulphate and sodium hydroxide as starting chemicals. All chemical reactions were carried out under identical MH conditions, namely, at 190°C, 154 psi, 30 min, by varying the molar ratio (MR) of FeSO
4 /NaOH in the aqueous solutions. The variation of MR has a dramatic effect on the crystallization behavior of various phases of iron oxides under MH processing conditions. For example, spherical agglomerates of Fe3 O4 powder were obtained if MR equal to 0.133 (pH > 10 sample A). On the other hand non-stoichiometric Fe3 O4 powders (Sample B) were obtained for all higher MR of FeSO4 /NaOH between 0.133 and 4.00 (6.6 < pH < 10). However, when MR was equal to 4.0 (pH ≅ 6.6) a varied distribution of shapes and sizes of agglomerates of -Fe2 O3 powders (sample C) were produced. Fe57 Mössbauer spectra were recorded for all the three sets of samples at room temperature. In the case of sample B, temperature dependent Mössbauer spectra were recorded in the range of 77–300 K to understand the non-stoichiometric nature of Fe3 O4 powders. All these results are discussed in the present paper. [ABSTRACT FROM AUTHOR] - Abstract: Copyright of Hyperfine Interactions is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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