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Title: Effect of dopants on barium hexaferrite
Authors: Salvi, S V
Joshi, V H
Keywords: Polycrystalline ferrites
Curie temperature
Issue Date: Apr-2009
Publisher: CSIR
Abstract: Samples of Ba<sub>1.266</sub>Ti<sub>2.956 </sub>Fe<sub>7.6</sub>Li<sub>0.844</sub>O<sub>19</sub> hexaferrite have been prepared using anatase and rutile phases of TiO<sub>2</sub> by classical ceramic route. A pure sample of Ba<sub> </sub>Fe<sub>12</sub>O<sub>19</sub> has also been prepared for comparison. The structural, electrical and magnetic characteristics have been studied by XRD, SEM, FTIR, two probe method, hysteresis loop and susceptibility curves. The samples exhibit hexagonal magnetoplumbic structure with spacegroup P6<sub>3</sub>/mmc and <i>p</i> type ferrimagnetic behaviour. BaFe<sub>12</sub>O<sub>19</sub> is a hard ferrite, however, the substituted hexaferrites are soft ferrites. The substitution causes increase in grain size and particle size. The <i style="">Mc</i> value, coercive force <i style="">Hc</i>, squareness <i style="">M<sub>R</sub>/Ms</i> and Curie temperature <i style="">T</i><sub>c</sub> are large for rutile TiO<sub>2</sub> based samples as compared to anatase TiO<sub>2</sub> based samples. However, the anatase allotrope based samples enhance the grain growth. These materials can be used in the applications related to magnetic recording, microwave absorption and EM absorption.
Description: 277-281
ISSN: 0019-5596
Appears in Collections:IJPAP Vol.47(04) [April 2009]

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