Open AccessSol–gel hydrothermal synthesis of strontium hexaferrite nanoparticles and the relation between their crystal structure and high coercivity properties
Author(s) -
Thi Minh Hue Dang,
Viet Dung Trinh,
Doan Huan Bui,
ManhHuong Phan,
Dang Chinh Huynh
Publication year - 2012
Publication title -
advances in natural sciences. nanoscience and nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.476
H-Index - 40
ISSN - 2043-6262
DOI - 10.1088/2043-6262/3/2/025015
Subject(s) - coercivity , materials science , strontium , rietveld refinement , hydrothermal circulation , calcination , nanoparticle , crystal structure , magnetization , crystal (programming language) , chemical engineering , phase (matter) , mineralogy , crystallography , nanotechnology , chemistry , condensed matter physics , magnetic field , organic chemistry , programming language , physics , quantum mechanics , computer science , engineering , catalysis
Hard magnetic strontium hexaferrite SrFe 12 O 19 nanoparticles were synthesized by the sol–gel hydrothermal method. The factors affecting the synthesized process, such as the mole proportion of the reactants, pH, temperature, the hydrothermal conditions and the calcination process, have been investigated. The crystal structures of these materials were refined by Rietveld method. The obtained materials have single crystal phase, equal nano-size, plate shape and high anisotropy. The high magnetic coercivity of 6.3 kOe with the magnetization at 11.1 kOe of 66 emu g −1 at room temperature was observed for the strontium hexaferrite nanoparticles. For other nanoparticles ( SrLn x Fe 12- x O 19 and SrFe 12 O 19 / CoFe 2 O 4 ) synthesized on the basis of SrFe 12 O 19 the complex completion of the crystal structure distortion and the interaction between magnetic phases were observed.