Abstract
In this study, SrFe12xTbxO19(0.00 x 0.1) hexaferrites (HFs) were prepared successfully by citrate sol-gel approach. X-ray powder diffraction analyses affirm the hexagonal structure of products. Impurityphase starts to appear forx 0.04. The crystallites sizes were estimated to be in the range of 33e46 nm.All the products exhibit inhomogeneous distribution of grain size detected through SEM. The analyses ofmagnetization versus applied magneticfield,M(H), were performed. Magnetization measurements weredone at room (300 K; RT) and low (10 K) temperatures. The different magnetic parameters includingsaturation magnetizationMs, remanenceMr, squareness ratio (SQR¼Mr/Ms), coercivityHc, and magneticmomentnBare deduced and discussed in detail. At both considered temperatures,M(H) results showferrimagnetic nature for all compositions. It is shown that the Tb substitutions significantly affectM(H)data. A significant increase in theMs,Mr, andnBis observed forx¼0.02 sample. The SQR values arearound 0.5 indicating the single domain nature with uniaxial anisotropy. The obtained magnetic resultswere investigated deeply with relation to structural and microstructural properties. M€ossbauer spec-troscopy results were also investigated. According to M€ossbauer results, the Tb3þions preferentiallyoccupy 12kand 4f2sites.