Nano Crystalline La Substituted Barium Hexaferrite Synthesized by Coprecipitation Method
La substituted barium hexaferrite Ba1-yFe12LayO19 with 0≤ y ≤0.5 was synthesized by chemical co-precipitation method using aqueous solutions of metallic chlorides at ambient temperature. NaOH was used as a precipitant. The co-precipitated products were annealed at 900 and 1000°C. The effects of La addition on the phase composition, morphology and thermal behavior of samples were studied using XRD, SEM and DTA/TGA, respectively. XRD results indicated that barium hexaferrite forms together with some intermediate phases in samples annealed at 900°C and the amount of intermediate phases decreased significantly by increasing annealing temperature to 1000°C. XRD results also showed that in sample annealed at 1000°C, the crystallite size of magnetic phase decreases from 98 to 64 nm by increasing the amount of La. Thermal analysis (DTA/TGA) implies that formation temperature of barium hexaferrite is increased with addition of La.
M.S.J. Hashmi, S. Mridha and S. Naher
A. Ataie and S. Moslemi, "Nano Crystalline La Substituted Barium Hexaferrite Synthesized by Coprecipitation Method", Advanced Materials Research, Vols. 264-265, pp. 795-800, 2011