4.7 Article

Structural, morphological, magnetic hysteresis and dielectric properties of cobalt substituted barium-lead hexagonal ferrites for technological applications

期刊

CERAMICS INTERNATIONAL
卷 47, 期 19, 页码 27441-27452

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.06.166

关键词

Ba0.4Pb0.6Fe12-xCoxO19 hexaferrites; FTIR; XRD; M-H loops; Dielectric properties

资金

  1. Nirma University, Ahmedabad, India [NU/Ph.D/MRP/IT/18-19/413]
  2. UGC, New Delhi, India [F.530/10/DRS/2018 (SAP-I)]
  3. DST, India for DST-FIST [SR/FST/PSI-198/2014]

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The study synthesized a series of M-type hexaferrites using citrate gel auto combustion method, showing various magnetic properties and influencing factors of cobalt substitution on dielectric properties.
M-type, Ba0.4Pb0.6Fe12-xCoxO19 (x = 0.00, 0.10, 0.20, 0.30, 0.40) hexaferrites, synthesized using citrate gel auto combustion method, and heated at 950 degrees C, 4 h for lossless applications. XRD analysis shows the development of the M-phase, along with PbM and hematite. The microstructural analysis reveals the stacking clusters of hexagonally shaped platelets. TEM image and SAED pattern of x = 0.3 composition shows polycrystalline nature and formed particles observed to fused with neighbouring particles. M - H loops of all samples reveal hard magnetic behaviour and possess multi-domain structure. The maximum saturation magnetization of 55.427 A m(2)/kg is observed in x = 0.10 composition and coercivity of prepared hexaferrites was found to vary from 0.058 T to 0.390 T. The cobalt substitution has a strong influence on the dielectric properties of prepared hexaferrites. The value of ac conductivity increases with cobalt substitution from x = 0.00 to x = 0.10, and followed by a reduction from x = 0.10 to x = 0.40. The same trend is observed for the dielectric constant. The low value of loss tangent for all compositions shows apt scope for lossless application.

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