TY - JOUR
T1 - Mechanism and microstructural evolution of polyol mediated synthesis of nanostructured M-type SrFe12O19
AU - Tenorio Gonzalez, F. N.
AU - Bolarín Miró, A. M.
AU - Sánchez De Jesús, F.
AU - Cortés Escobedo, C. A.
AU - Ammar, S.
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/6/1
Y1 - 2016/6/1
N2 - The synthesis mechanism of nanostructured M-type strontium hexaferrite SrFe12O19 with high coercivity (5.7 kOe) obtained by a polyol process and annealing is proposed. The results show that the hexaferrite is synthesized through the formation of a complex with diethylene glycol during the hydrolysis and solvation stage, followed by the condensation of magnetite and strontium oxide. The results of the monitoring of the process by X-ray diffraction (XRD) of synthesized powders, magnetization hysteresis loops and micromorphology are presented and discussed. The proposed mechanism suggests the intermediate formation of the magnetite phase, which shows coercivity near zero at room temperature and confirms the nanoscale of the particles. Results of thermogravimetric and differential thermal analysis indicate that this phase is followed by the formation of the hematite phase after a heat treatment up to 543 °C in an oxidizing atmosphere. Finally, the hexagonal phase is obtained after application of annealing at 836 °C through the reaction between hematite and strontium oxide.
AB - The synthesis mechanism of nanostructured M-type strontium hexaferrite SrFe12O19 with high coercivity (5.7 kOe) obtained by a polyol process and annealing is proposed. The results show that the hexaferrite is synthesized through the formation of a complex with diethylene glycol during the hydrolysis and solvation stage, followed by the condensation of magnetite and strontium oxide. The results of the monitoring of the process by X-ray diffraction (XRD) of synthesized powders, magnetization hysteresis loops and micromorphology are presented and discussed. The proposed mechanism suggests the intermediate formation of the magnetite phase, which shows coercivity near zero at room temperature and confirms the nanoscale of the particles. Results of thermogravimetric and differential thermal analysis indicate that this phase is followed by the formation of the hematite phase after a heat treatment up to 543 °C in an oxidizing atmosphere. Finally, the hexagonal phase is obtained after application of annealing at 836 °C through the reaction between hematite and strontium oxide.
KW - Chemical synthesis
KW - Crystal growth
KW - High coercivity
KW - Polyol
KW - Strontium hexaferrite
KW - Synthesis mechanism
UR - http://www.scopus.com/inward/record.url?scp=84956881653&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2016.01.068
DO - 10.1016/j.jmmm.2016.01.068
M3 - Artículo
SN - 0304-8853
VL - 407
SP - 188
EP - 194
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
ER -