title: Sonochemical assisted synthesis of SrFe12O19 nanoparticles.
abstract: We present the synthesis of M-type strontium hexaferrite by sonochemistry and annealing. The effects of the sonication time and thermal energy on the crystal structure and magnetic properties of the obtained powders are presented. Strontium hexagonal ferrite (SrFe12O19) was successfully prepared by the ultrasonic cavitation (sonochemistry) of a complexed polyol solution of metallic acetates and diethylene glycol. The obtained materials were subsequently annealed at temperatures from 300 to 900 °C. X-ray diffraction analysis shows that the sonochemical process yields an amorphous phase containing Fe(3+), Fe(2+) and Sr(2+) ions. This amorphous phase transforms into an intermediate phase of maghemite (γ-Fe2O3) at 300 °C. At 500 °C, the intermediate species is converted to hematite (α-Fe2O3) by a topotactic transition. The final product of strontium hexaferrite (SrFe12O19) is generated at 800 °C. The obtained strontium hexaferrite shows a magnetization of 62.3 emu/g, which is consistent with pure hexaferrite obtained by other methods, and a coercivity of 6.25 kOe, which is higher than expected for this hexaferrite. The powder morphology is composed of aggregates of rounded particles with an average particle size of 60 nm.
authors.affiliation: Área Académica de Ciencias de la Tierra y Materiales, UAEH, Carr. Pachuca-Tulancingo Km. 4.5, C.P. 42184 Pachuca, Hidalgo, Mexico.
authors.forename: R L
authors.initials: RL
authors.lastname: Palomino
authors.affiliation: Área Académica de Ciencias de la Tierra y Materiales, UAEH, Carr. Pachuca-Tulancingo Km. 4.5, C.P. 42184 Pachuca, Hidalgo, Mexico.
authors.forename: A M
authors.initials: AM
authors.lastname: Bolarín Miró
authors.affiliation: Área Académica de Ciencias de la Tierra y Materiales, UAEH, Carr. Pachuca-Tulancingo Km. 4.5, C.P. 42184 Pachuca, Hidalgo, Mexico.
authors.forename: F N
authors.initials: FN
authors.lastname: Tenorio
authors.affiliation: Área Académica de Ciencias de la Tierra y Materiales, UAEH, Carr. Pachuca-Tulancingo Km. 4.5, C.P. 42184 Pachuca, Hidalgo, Mexico. Electronic address: fsanchez@uaeh.edu.mx.
authors.forename: F
authors.initials: F
authors.lastname: Sánchez De Jesús
authors.affiliation: Centro de Investigación e Innovación Tecnológica del Instituto Politécnico Nacional, Cerrada Cecati s/n Col Sta. Catarina, C.P. 02250 Azcapotzalco, D.F., Mexico.
authors.forename: C A
authors.initials: CA
authors.lastname: Cortés Escobedo
authors.affiliation: ITODYS, UMR-CNRS 7086, Université de Paris-Diderot, 75205 Cedex 13 Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Ammar
keywords: Hexaferrite nanoparticles; Sonochemical synthesis; Sonochemistry; SrFe(12)O(19); Strontium hexaferrite