期刊
CERAMICS INTERNATIONAL
卷 46, 期 6, 页码 8209-8226出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.12.049
关键词
Er- substituted X-type hexaferrite; Simple heat treatment method; Structural; Magnetic and dielectric measurements
资金
- Nirma University, Ahmedabad, India [NU/Ph.D./MRP/IT/18-19/413]
- UGC, New Delhi, India [F.530/10/DRS/2018 (SAP-I)]
- DST, India [SR/FST/PSI-198/2014]
A series of Erbium substituted X-type Ba2Co2ErxFe28-xO46 (x = 0.00. 0.04, 0.08, 0.12, 0.16, and 0.20) hexaferrites were prepared by the method of heat treatment. The obtained precursors were heated at 1350 degrees C for 6 h. XRD investigation reveals that x = 0.0 sample possesses X, W-type, and alpha-Fe2O3 phases, while Er- substituted samples show presence of X and W phases. The room temperature Mossabuer spectra have been fitted with five sextets. A variation in saturation magnetization (M-s) is explained and supported by the Mossbauer spectroscopy. The maximum values of M-s (52.29 Am-2/kg) and anisotropy field-Ha (1370 kA/m) are found for x = 0.12 composition. Similarly, the maximum relative area (similar to 69%) for spin up sites (k + a+ b) is also found for x = 0.12 composition. Low frequency (20 Hz-2 MHz) dielectric response of all samples show normal behavior of ferromagnetic materials. The dielectric measurements reveal that the conduction in low frequency is due to grain boundary contributions and at the higher frequency it is due to grain contributions. AC conductivity is found to increase with frequency in all prepared hexaferrites. The substituted compositions can have potential applications in filter application due to soft ferrite behavior and low dielectric loss tangent.
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