Structural, Magnetic and Dielectric Properties of Aluminum Cobalt Substituted M-type Strontium Hexaferrites

Abstract

SrCo x Al x Fe (12-2x) O 19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) hexaferrites have been synthesized using a simple heat treatment method and characterized using various instrumental techniques such as FTIR, XRD, SEM, VSM and dielectric measurements. The XRD analysis reveals the formation of mixed phases of M-type hexaferrite and α-Fe 2 O 3 . The crystallite size is found in the range of 24-46 nm. The micrographs of typical samples show porous and agglomerated grains. The values of M s , M r , H c decreased with the increase of Co-Al content. The values of the dielectric constant, tangent loss, AC conductivity and dielectric modulus were studied as a function of frequency.