![](/images/graphics-bg.png)
Microstructure and Electromagnetic Properties of Ni-Zn-Co Ferrite up to 20 GHz
Author
Source
Advances in Materials Science and Engineering
Issue
Vol. 2016, Issue 2016 (31 Dec. 2016), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2016-04-13
Country of Publication
Egypt
No. of Pages
7
Abstract EN
The present paper examines the relation between different developed microstructures and the microwave electromagnetic properties in Ni-Zn-Co ferrite.
To this end, the Ni0.25Zn0.25Co0.5Fe2O4 composition has been prepared with the conventional ceramic process with varied prefiring T P (750°C, 1000°C) and sintering T S top temperatures (1200°C, 1250°C).
When lower temperatures are applied in these production stages, incomplete microstructures with low density, higher porosity, or finer grains are achieved.
On account of these features, the contributions of domain wall motion and spin rotation to the complex permeability μ ⁎ ( f ) move to higher frequencies, whereas microwave dielectric permittivity ε ⁎ ( f ) is decreased.
In particular in conjunction with the high Co content, the wall relaxation and spin resonance are interestingly forced to occur at 850 MHz and 8.05 GHz, respectively.
Regarding the electromagnetic wave attenuation, the ferrite annealed at lower temperatures exhibits strong return loss peaks at higher frequencies, but without other performance improvement.
We should notice that the variations in sintering temperature T S yield the maximum changes in the recorded parameters, including the coercive field, μ ⁎ ( f ) , and ε ⁎ ( f ) , indicating the inferior role of prefiring T P in Ni-Zn ferrite.
American Psychological Association (APA)
Stergiou, Charalampos. 2016. Microstructure and Electromagnetic Properties of Ni-Zn-Co Ferrite up to 20 GHz. Advances in Materials Science and Engineering،Vol. 2016, no. 2016, pp.1-7.
https://search.emarefa.net/detail/BIM-1096021
Modern Language Association (MLA)
Stergiou, Charalampos. Microstructure and Electromagnetic Properties of Ni-Zn-Co Ferrite up to 20 GHz. Advances in Materials Science and Engineering No. 2016 (2016), pp.1-7.
https://search.emarefa.net/detail/BIM-1096021
American Medical Association (AMA)
Stergiou, Charalampos. Microstructure and Electromagnetic Properties of Ni-Zn-Co Ferrite up to 20 GHz. Advances in Materials Science and Engineering. 2016. Vol. 2016, no. 2016, pp.1-7.
https://search.emarefa.net/detail/BIM-1096021
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1096021