Publication details
MAGHEMITE NANOPOWDER SYNTHESIZED BY ATMOSPHERIC-PRESSURE MICROWAVE TORCH DISCHARGE USING IRON PENTACARBONYL AS A PRECURSOR
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| Year of publication | 2011 |
| Type | Conference abstract |
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| Description | Microwave torch discharge ignited in Ar at atmospheric pressure has been used for the synthesis of maghemite gamma-Fe2O3 nanoparticles. A double-walled nozzle electrode enabled to introduce gases separately: Ar flowed in the central channel, whereas the mixture of H2/O2/Fe(CO)5 was added into the Ar torch discharge through the outer channel. The composition and properties of the synthesized nanopowder were studied by TEM, XRD, Raman and Mossbauer spectroscopies. For magnetic measurements in the range 293-1073 K a vibrating sample magnetometer was used. The measurements of ZFC/FC curves and heat capacity in the range 4-293 K were done on a PPMS Quantum Design device. Only gamma-Fe2O3 phase with the mean crystallite size of 20 nm was identified by XRD in the representative sample. The measured Raman spectrum matched well those reported for gamma-Fe2O3 powders in the literature. In the Mossbauer transmission spectrum measured at 5 K the two sextets characteristic for gamma-Fe2O3 were clearly identified. Structural changes and phase transformations of the nanopowder up to 1073 K are described. |