| Autor: |
Mukhtar Ahmad, M.U. Rana, R. Grössinger, Ishtiaq Ahmad, Ihsan Ali |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Journal of Alloys and Compounds. 577:382-388 |
| ISSN: |
0925-8388 |
| DOI: |
10.1016/j.jallcom.2013.05.135 |
| Popis: |
The effects of Al-substitution on electrical, magnetic and high frequency dielectric parameters of single phase BaCo2AlxFe16−xO27 (x = 0–1) hexaferrites have been discussed in the present work. The XRD patterns reveal the single phase formation of these ferrites. Bulk density, X-ray density and porosity as a function of Al contents were calculated. Incorporation of Al into the W-type hexagonal structure was confirmed by energy-dispersive X-ray spectroscopic (EDXS) technique. The DC resistivity was observed to increase with increasing Al contents due to the unavailability of Fe3+ ions. The M–H loops were measured up to a maximum applied field of 9 T. The saturation magnetization (Ms) values were calculated by the law of approach to saturation. The coercivity (Hc) values for all the samples lie in the range of a few hundred oersteds which is one of the necessary conditions for EM materials, security, switching and sensing applications. The high frequency dielectric constant and dielectric loss in the frequency range of 0.025–1.5 GHz were observed to decrease as a function of Al contents which are favorable for high frequency applications and microwave devices like dielectric resonators. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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