Effects of polyvinylpyrrolidone content on structure and microwave absorption properties of cobalt ferrite
Abstract
The microstructure and microwave absorptivity of cobalt ferrite, prepared using different amounts of polyvinylpyrrolidone (PVP) by a facile solvothermal treatment, were investigated systematically. Results showed that the grain size increased as the PVP content increased. However, the hollowness of cobalt ferrite increased initially and then decreased and the hollowness was maximal when the amount of PVP was 40 g. The material showed only cobalt ferrite phase, irrespective of PVP content. The crystallization degree increased with increase in PVP content. Microwave absorption improved significantly due to incorporation of PVP. The material showed excellent microwave absorption performance with 40 g of PVP. For this sample with a thickness of 2.10 mm, the minimum reflection loss was -47.24 dB at 11.52 GHz and reflection loss below -10 dB was 4.56 GHz (10.4-14.96 GHz). Therefore, this absorber has good potential as microwave absorption material with low density, wide effective bandwidth, and strong absorptivity.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- July 2020
- DOI:
- 10.1016/j.jmmm.2020.166791
- Bibcode:
- 2020JMMM..50666791Y
- Keywords:
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- Cobalt ferrite;
- Hollow spheres;
- Polyvinylpyrrolidone;
- Microwave absorption